Near-infrared detection assembly and near-infrared detector

Abstract

The application discloses a near-infrared detection assembly and a near-infrared detector for detecting near-infrared light, the near-infrared detection assembly comprising an optical superlens, a gold nanostructure film and a lanthanide series upconversion nanomaterial film, the gold nanostructure film and the lanthanide series upconversion nanomaterial film being sequentially stacked on the light exit surface of the optical superlens, and the optical superlens being used for converging the near-infrared light on the gold nanostructure film. The near-infrared detection assembly provided by the application converges the near-infrared light through the optical superlens, realizes the first amplification of the near-infrared light, then makes the near-infrared signal be further enhanced through the surface plasmon effect of the gold nanostructure film, realizes the conversion of the infrared signal into the visible light signal visible to the human eye through the spectral upconversion property of the lanthanide series upconversion nanomaterial after twice amplification, and thus realizes the detection of the near-infrared signal with a lower threshold. Meanwhile, the near-infrared detection assembly can realize room-temperature detection when detecting the near-infrared signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of infrared detection, and more particularly to a near-infrared detection assembly and a near-infrared detector. BACKGROUND

[0002] In the related art, in order to facilitate the detection of infrared signals, lanthanide upconversion nanomaterials are usually used to convert infrared signals into visible light signals that are easy to detect. However, the relatively high pump threshold (resulting from the low absorption cross section and quantum efficiency) limits the use of lanthanide upconversion nanomaterials in the detection of near-infrared light, so that they cannot detect near-infrared signals with a lower threshold. SUMMARY

[0003] The present application provides a near-infrared detection assembly and a near-infrared detector.

[0004] The near-infrared detection assembly of the present application is used to detect near-infrared light, and comprises an optical superlens, a gold nanostructure film and a lanthanide upconversion nanomaterial film. The gold nanostructure film and the lanthanide upconversion nanomaterial film are sequentially stacked on the light-emitting surface of the optical superlens, and the optical superlens is used to converge the near-infrared light on the gold nanostructure film.

[0005] The near-infrared detection assembly provided by the embodiments of the present application converges near-infrared light through an optical superlens, realizes the first amplification of the near-infrared light, and then, through the surface plasmon effect of a gold nanostructure film, the near-infrared light signal is further amplified, and energy transfer from plasmonic particles to adjacent lanthanide upconversion nanoparticles occurs. When the absorption spectrum peak position of the lanthanide upconversion nanomaterial is basically consistent with the plasmon resonance spectrum peak position of the gold nanostructure material, energy transfer from plasmons to the lanthanide upconversion nanomaterial is induced, thereby increasing the excitation rate of the lanthanide upconversion nanomaterial, and then realizing fluorescence (visible light) enhancement. In other words, due to the surface plasmon effect of the gold nanostructure material, the enhanced local electromagnetic field around it can make the near-infrared light concentrate around it, which will increase the absorption cross section of the adjacent lanthanide upconversion nanomaterial. The large molar extinction coefficient of the gold nano material further promotes the absorption of light. Therefore, in order to improve the excitation rate of the lanthanide upconversion nanomaterial, it is crucial to match the plasmon resonance peak position of the gold nanostructure material with the absorption spectrum peak position of the fluorescent group. Further, the increase in the absorption cross section enables the lanthanide upconversion nanomaterial film to absorb more near-infrared light and convert it into visible light, thereby enhancing the intensity of the visible light signal, so that the visible light signal is further amplified, and after two amplifications, the infrared signal is converted into a visible light signal visible to the human eye, thereby realizing the detection of a lower threshold near-infrared signal. At the same time, in the related art, the infrared detector is usually a photon-type infrared detector, which will generate a large thermal noise and dark current at room temperature, and it is difficult to work normally. In order to ensure its use performance, it needs to be used in a low-temperature environment. Compared with the traditional photon-type infrared detector, the present near-infrared detection assembly can realize detection at room temperature when detecting a near-infrared signal.

[0006] In some embodiments, the near-infrared detection assembly further comprises an image sensor, the image sensor is located on the side of the lanthanide upconversion nanomaterial film away from the optical superlens, and the image sensor is used to receive the visible light signal formed by the near-infrared light.

[0007] In this way, the visible light formed by the near-infrared light can be captured by the image sensor, and the capture of the image sensor is more accurate and sensitive than the judgment of the naked eye.

[0008] In some embodiments, the near-infrared detection assembly further comprises a filter, the filter is located between the image sensor and the lanthanide upconversion nanomaterial film, and the filter is attached to the lanthanide upconversion nanomaterial film.

[0009] In this way, the filter is used to filter out other signals except the visible light signal emitted by the lanthanide upconversion nanomaterial.

[0010] In some embodiments, the near-infrared detection assembly further comprises a processor configured to perform background correction on the visible light signal received by the image sensor.

[0011] In this way, the background correction can remove environmental noise in the visible light signal received by the image sensor.

[0012] In some embodiments, the optical superlens comprises a substrate layer and a plurality of subwavelength nanostructure units disposed on the substrate layer.

[0013] In some embodiments, the focal point of the optical superlens falls on the gold nanostructure film or the lanthanide upconversion nanomaterial film.

[0014] In this way, the vicinity of the focal point of the lens is where the near-infrared light is most concentrated, and disposing the gold nanostructure film and the lanthanide upconversion nanomaterial film at this location facilitates the absorption of more near-infrared light by the gold nanostructure film and the lanthanide upconversion nanomaterial film.

[0015] In some embodiments, the gold nanostructure film is a gold nanorod film.

[0016] In this way, the gold nanorod film has greater flexibility and can be adjusted as needed to meet more needs. Specifically, the size or aspect ratio of the gold nanorod can be adjusted according to the absorption spectrum of the lanthanide upconversion nanomaterial used, so as to achieve plasmonic resonance matching.

[0017] In some embodiments, the thickness of the gold nanorod film is 10-100 nanometers.

[0018] In this way, a thickness of the gold nanorod film greater than 100 nanometers will reduce the utilization rate of near-infrared light and the transmittance of light, and a thickness of the gold nanorod film less than 10 nanometers will increase the difficulty of production, so the thickness of the gold nanorod film is 10-100 nanometers.

[0019] In some embodiments, the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film and the wavelength position corresponding to the absorption spectrum peak of the lanthanide upconversion nanomaterial film are substantially the same.

[0020] In this way, it is beneficial to improve the utilization rate of near-infrared light, thereby improving the intensity of the converted visible light.

[0021] The near-infrared detector of another embodiment of the present application comprises the near-infrared detection assembly of any one of the above.

[0022] Additional aspects and advantages of embodiments of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0024] Figure 1 is a structural schematic diagram of a near-infrared detection assembly according to an embodiment of the present application;

[0025] Figure 2 is a structural schematic diagram of another view of a near-infrared detection assembly according to an embodiment of the present application;

[0026] Figure 3 is an absorption spectrum diagram of a gold nanostructure film according to an embodiment of the present application;

[0027] Figure 4 is an absorption spectrum diagram of a lanthanide upconversion nanomaterial film according to an embodiment of the present application;

[0028] Figure 5 is a module schematic diagram of an image sensor according to an embodiment of the present application.

[0029] Main element symbol explanation: near-infrared detection assembly 100, optical superlens 10, substrate layer 11, nanometer unit 12, gold nanostructure film 20, lanthanide upconversion nanomaterial film 30, filter 40, image sensor 50, processor 60. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals indicate like elements or elements having the same or similar function throughout the several views. The embodiments described below are examples of the present application, which are only used to explain the present application, and cannot be understood as a limitation of the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0031] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] The disclosure herein provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and arrangements of specific examples are described herein. Of course, they are only examples, and the purpose is not to limit the application. In addition, the application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0034] At present, the main technology of near-infrared detector is concentrated on tellurium cadmium mercury, quantum well, superlattice, two-dimensional metal chalcogenide and lanthanide up-conversion nanoparticles and other materials. Among them, the lanthanide up-conversion nanomaterial has the unique property of two-photon or multi-photon excitation, and is non-toxic and has low preparation cost, which is an excellent solution to convert near-infrared signal into visible light signal easy to detect.

[0035] In the related art, in order to facilitate the detection of infrared signal, lanthanide up-conversion nanomaterial is usually used to convert infrared signal into visible light signal easy to detect. However, the relatively high pump threshold (resulting from the low absorption cross-section and quantum efficiency) limits the use of lanthanide up-conversion nanomaterial in the detection of near-infrared light, so that it cannot detect the near-infrared signal with a lower threshold.

[0036] Please refer to Figure 1The embodiment of the present application provides a near-infrared detector for detecting near-infrared light, comprising a near-infrared detection assembly 100. The near-infrared detection assembly 100 comprises an optical superlens 10, a gold nanostructure film 20 and a lanthanide series upconversion nanomaterial film 30, and the gold nanostructure film 20 and the lanthanide series upconversion nanomaterial film 30 are sequentially stacked on the light exit surface of the optical superlens 10, and the optical superlens 10 is used for converging near-infrared light on the gold nanostructure film 20.

[0037] The near-infrared detection assembly 100 provided by the embodiment of the present application converges near-infrared light through the optical superlens 10, realizes the first amplification of the near-infrared light, then absorbs the near-infrared light through the surface plasmon of the gold nanostructure film 20, and performs energy transfer from the plasmon particles to the adjacent lanthanide series upconversion nanoparticles. When the absorption spectrum peak position of the lanthanide series upconversion nanomaterial is basically consistent with the plasmon resonance peak position of the gold nanostructure material, energy transfer from the plasmon to the lanthanide series upconversion nanomaterial is induced, so that the excitation rate of the lanthanide series upconversion nanomaterial is increased, and then the fluorescence (visible light) is enhanced. In other words, due to the surface plasmon effect of the gold nanostructure material, the enhanced local electromagnetic field around it can make the near-infrared light concentrate around it, which will increase the absorption cross section of the adjacent lanthanide series upconversion nanomaterial. The large molar extinction coefficient of the gold nano material further promotes the absorption of light. Therefore, in order to improve the excitation rate of the lanthanide series upconversion nanomaterial, it is crucial to match the resonance peak position of the gold nanostructure material with the absorption spectrum peak position of the fluorescent group. Further, the increase of the absorption cross section enables the lanthanide series upconversion nanomaterial film 30 to absorb more near-infrared light and convert it into visible light, thereby enhancing the intensity of the visible light signal, so that the visible light signal is further amplified, and the near-infrared signal is converted into a visible light signal visible to the human eye through twice amplification, thereby realizing the detection of a lower threshold near-infrared signal. Meanwhile, in the related art, the infrared detector is usually a photon-type infrared detector, which will generate a large thermal noise and dark current at room temperature, and is difficult to work normally. In order to ensure its use performance, it needs to be used in a low-temperature environment. Compared with the photon-type infrared detector, the near-infrared detection assembly 100 can realize room-temperature detection when detecting the near-infrared signal.

[0038] Specifically, the near-infrared light (NIR) is an electromagnetic wave between the visible light (Visible Light) and the middle infrared light (Middle Infrared, MIR), and its wavelength range is between 780-2526nm according to the definition of ASTM (American Society for Testing and Materials). Conventionally, people divide the near-infrared region into two regions, namely, near-infrared short wave (780-1100nm) and near-infrared long wave (1100-2526nm).

[0039] The functional component of the gold nanostructure film 20 is gold material with nanostructure, including but not limited to gold nanorods, gold nanoshells, gold nanocages, gold nanoplates, dendritic gold nanostructures, bimetallic nanocrystals formed by gold and other metals, etc. By designing the size and synthesis method of gold nanostructure material, strong absorption of near-infrared light can be achieved.

[0040] Surface plasmon is a kind of electromagnetic mode formed by the interaction of free electrons on the surface of metal and photons. Surface plasmon is easy to be excited in metals and semiconductors, and is a collective motion of conducting electrons. The electron excitation of gold nanoparticles in the near-infrared waveband range will cause the effect of localized surface plasmon resonance (LSPR). This effect makes the gold nanostructure produce strong optical response to light of specific frequency, including light scattering and light absorption. When the frequency of incident light matches the oscillation frequency of free electrons in metal nanostructure, plasmon resonance occurs. This resonance will cause the enhancement of absorption and scattering of light by metal nanostructure, and produce strong local electric field enhancement effect.

[0041] The lanthanide series upconversion nanomaterial film 30 is a film structure obtained by uniformly dispersing lanthanide series upconversion nanomaterials in a crosslinking agent and then spin coating. The selected crosslinking agent can be polydimethylsiloxane (PDMS) or polymethyl methacrylate (PMMA). The thickness of the lanthanide series upconversion nanomaterial film 30 is selected to be tens of nanometers to several microns, which needs to ensure that the thickness of the lanthanide series upconversion nanomaterial film 30 does not affect the transmittance of near-infrared light.

[0042] Lanthanide series upconversion nanomaterial is a special nanomaterial, which usually contains lanthanide elements (such as lanthanum, cerium, praseodymium, neodymium, etc.) and possibly other elements or compounds. This material has unique optical properties, especially upconversion luminescence properties.

[0043] Upconversion is a nonlinear optical process, also known as upconversion or anti-Stokes luminescence. In this process, by absorbing two or more low-energy photons (such as infrared or near-infrared light), the material can emit a high-energy photon (such as visible or ultraviolet light). This process violates the Stokes law, so it is called "upconversion" or "anti-Stokes" process.

[0044] In some embodiments, the near-infrared detection assembly 100 further comprises an image sensor 50, which is located on the side of the lanthanide upconversion nanomaterial film 30 away from the optical superlens 10, and is used to receive the visible light signal formed by the near-infrared light.

[0045] In this way, the visible light formed by the near-infrared light can be captured by the image sensor 50, which is more accurate and sensitive than the naked eye.

[0046] Specifically, the image sensor 50 is an electronic device used to capture optical images, which is usually based on semiconductor technology and uses different working principles. The main function of the image sensor 50 is to convert visible light, infrared light or other light in the spectrum into an electrical signal so that digital devices can process, display or store these images.

[0047] Optionally, the image sensor 50 is a CCD photoelectric readout module or a CMOS photoelectric readout module. The CMOS photoelectric readout module is an important component in the CMOS sensor, which uses a light-sensitive element to convert light into an electrical signal, and then uses a readout circuit to amplify and convert the electrical signal into a digital signal output. The CCD photoelectric readout module is a module that uses a charge-coupled device (CCD) to convert optical energy into electrical energy, and then realizes optical signal acquisition and transmission.

[0048] The CMOS photoelectric readout module has the advantages of high sensitivity, high resolution and high-speed readout, and the noise level of the CCD photoelectric readout module is relatively low, which can provide clear and detailed images. The appropriate image sensor 50 can be selected according to actual needs.

[0049] Please refer to Figure 1 and Figure 2 In some embodiments, the near-infrared detection assembly 100 further comprises a filter 40, which is located between the image sensor 50 and the lanthanide upconversion nanomaterial film 30, and is attached to the lanthanide upconversion nanomaterial film 30.

[0050] In this way, the filter 40 is used to filter out other signals other than the visible light signal emitted by the lanthanide upconversion nanomaterial.

[0051] Specifically, the filter 40, also known as the optical filter, is an optical element that filters light. It selectively transmits light of a specific frequency or wavelength while blocking or attenuating other frequencies or wavelengths of light, in order to separate, select and adjust light waves. The filter 40 is widely used in optical systems to change the characteristics of light to meet specific needs and applications.

[0052] The working principle of the filter 40 is based on optical principles such as diffraction, interference, and absorption. It is composed of one or more layers of substances with specific properties, which can be thin films, glass, or crystals, etc., and the thickness can be adjusted to achieve the desired filtering effect. When light passes through the filter 40, light waves of specific wavelengths or frequencies will be selectively transmitted according to the properties of the filter 40, while other wavelengths or frequencies of light waves are blocked.

[0053] Common materials of the filter 40 include glass, ceramic, metal, plastic, or other composite materials, and the appropriate filter 40 can be selected according to actual needs.

[0054] Please refer to Figure 5 In some embodiments, the near-infrared detection assembly 100 further comprises a processor 60 for performing background correction on the visible light signal received by the image sensor 50.

[0055] In this way, the background correction can remove the environmental noise in the visible light signal received by the image sensor 50.

[0056] Specifically, the processor 60 is electrically connected to the image sensor, and after the image sensor 50 receives the visible light converted from the near-infrared light, an electrical signal is formed and transmitted to the processor 60, and the processor 60 performs corresponding background correction on the electrical signal.

[0057] Background correction (also known as background correction) is essentially a subtraction process, which is used to remove non-specific binding (i.e. noise signal) from the total signal to obtain the true signal. This process is particularly important in analyzing chip data or other scenarios that require accurate measurement.

[0058] Further, the near-infrared detection assembly 100 can also directly detect near-infrared light in a dark box, at this time, since there is no environmental noise introduced by environmental light, it is not necessary to additionally increase the processor 60 and perform background correction.

[0059] Please refer to Figure 2 In some embodiments, the optical superlens 10 comprises a substrate layer 11 and a plurality of subwavelength nanostructure units 12 arranged on the substrate layer 11.

[0060] The optical superlens 10 is a kind of super surface device which is expected to replace optical system to some extent, and the super surface shows great advantages in phase control with the continuous maturity of the Winnebago manufacturing process technology. The super surface can be considered as a two-dimensional form of super material, and is formed by accurately analyzing and screening specific parameter nanometer units through computer technology and being distributed on the substrate in a unique arrangement. The super surface can accurately control the phase, polarization state and other characteristics of light waves through the artificial design of its precise geometric structure. The super surface has the characteristics of low loss, lightness, convenience, large-scale production and the like. The optical superlens 10 and the traditional lens structure have different principles of phase control. The optical superlens 10 controls light waves through the abrupt phase shift of sub-wavelength micro-nano units, and then makes each light beam converge at a certain set position, and no longer depends on the continuous optical path accumulation of each light path. Therefore, the phase distribution of the optical superlens can be designed to realize the focusing function.

[0061] Specifically, the optical superlens 10 is generally composed of a substrate 11 and a plurality of specific arranged sub-wavelength nanometer units 12, which include but are not limited to antennas, rings, rods, holes, slits and the like. The phase delay can be controlled by changing the size or arrangement of the nanometer units to realize the function of light beam focusing.

[0062] The optical superlens 10 is small in size and can be highly integrated, which is conducive to the miniaturization, lightness and integration of the near-infrared detection assembly 100.

[0063] In some embodiments, the focal point converged by the optical superlens 10 falls on the gold nanostructure film 20 or the lanthanide series upconversion nanometer material film 30.

[0064] In this way, the focal point converged by the optical superlens 10 is the most concentrated place of near-infrared light convergence, and the lanthanide series upconversion nanometer material film 30 is arranged at this place to absorb and utilize more near-infrared light.

[0065] Specifically, the focal point converged by the optical superlens 10 is an important optical property of the optical superlens 10.

[0066] In this embodiment, since the thickness of the gold nanostructure film 20 or the lanthanide series upconversion nanometer material film 30 is nanoscale, the local electric field with greatly enhanced intensity after the near-infrared light is focused by the optical superlens 10 is limited in a small area, and therefore the gold nanostructure film 20 or the lanthanide series upconversion nanometer material film 30 only needs to be located inside this area in the thickness direction.

[0067] In some embodiments, the gold nanostructure film 20 is a gold nanorod film.

[0068] Therefore, the gold nanorod film has greater flexibility, and can be flexibly adjusted according to actual needs, thereby meeting more needs.

[0069] Specifically, the gold nanostructure in the gold nanostructure film 20 can be a gold nanorod, a gold nanoshell, a gold nanocage, a gold nanoplate, a dendritic gold nanostructure, a bimetallic nanocrystal formed by gold and other metals, etc. In this embodiment, the gold nanostructure is a gold nanorod.

[0070] The gold nanorod has anisotropic optical properties, that is, the optical response thereof is closely related to the size, shape and arrangement of the nanorod. This enables the gold nanorod film to achieve precise regulation of light waves, including absorption, scattering and polarization of light, etc. In contrast, other gold nanostructure films 20 are difficult to be designed and synthesized simply to have such highly anisotropic optical properties. In addition, the optical properties of the gold nanorod film can be regulated by adjusting the size, shape and arrangement of the nanorod. Such tunability enables the gold nanorod film to have greater flexibility in the preparation of high-performance optical devices and sensors.

[0071] In some embodiments, the thickness of the gold nanorod film is 10-100 nanometers.

[0072] Therefore, the thickness of the gold nanorod film exceeding 100 nanometers will reduce the transmittance of light, and the thickness of the gold nanorod film less than 10 nanometers will increase the production difficulty, and thus the thickness of the gold nanorod film is 10-100 nanometers.

[0073] Specifically, since the gold nanorod film needs to have high electrical conductivity and optical transparency while ensuring mechanical strength and chemical stability when in use, the mechanical strength and chemical stability of the gold nanorod film are difficult to be guaranteed when the thickness thereof is less than 10 nanometers, which will greatly reduce the reliability and stability thereof, and the optical transparency of the gold nanorod film will not meet the needs when the thickness thereof is greater than 100 nanometers, which will greatly reduce the transmittance of light. Therefore, the thickness of the gold nanorod film is 10-100 nanometers, and the film with such a thickness range also has high mechanical strength and chemical stability, can maintain stable performance in various complex environments, and the electrical conductivity and optical transparency thereof can also be guaranteed.

[0074] In some embodiments, the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film 20 and the wavelength position corresponding to the absorption spectrum peak of the lanthanide series upconversion nanomaterial film 30 are substantially consistent.

[0075] Therefore, it is beneficial to improve the utilization rate of near-infrared light, thereby improving the intensity of the converted visible light.

[0076] Specifically, the surface plasmon resonance peak is the peak value generated when the collective oscillation of free electrons resonates with the incident electromagnetic field that excites it at a specific wavelength. This phenomenon involves various physical processes such as visible light, microwave, and sub-electron energy spectrum, and is the basis for the reflection and absorption of electromagnetic waves of specific spectrum on the metal surface and the absorption of specific spectrum on the semiconductor surface.

[0077] Referring to Figure 3 , Figure 3 is the absorption spectrum of the gold nanostructure film 20, and the abscissa value corresponding to the highest point of the curve is the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film 20, which is about 980 nanometers.

[0078] The absorption spectrum peak refers to the prominent absorption peak value on the spectrum graph, indicating that light of a specific wavelength is absorbed by the sample. In the absorption spectrum measured on a spectrophotometer or spectrometer, the absorption peak usually represents the presence of a specific chemical component in the sample. Different compounds or molecules have different absorption peak positions and intensities in the spectrum, so the absorption peak can be used to analyze and identify the composition and structure of the substance.

[0079] Referring to Figure 4 , Figure 4 is the absorption spectrum of the lanthanide series upconversion nanomaterial film 30, and the wavelength position corresponding to the highest point of the curve is the wavelength position corresponding to the absorption spectrum peak of the lanthanide series upconversion nanomaterial film 30, which is about 980 nanometers, which is basically consistent with the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film 20 shown in Figure 3 .

[0080] When the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film 20 and the wavelength position corresponding to the absorption spectrum peak of the lanthanide series upconversion nanomaterial film 30 are basically consistent, a resonance enhancement effect will occur. This means that the gold nanostructure can enhance the absorption ability of the lanthanide series upconversion nanomaterial to near-infrared light, because they can respond to light in the same wavelength range. Secondly, the basic consistency of the absorption peak position means that the energy states of the two materials can be well matched. In this case, the gold nanostructure can capture near-infrared light and then transfer it to the lanthanide series upconversion nanomaterial, effectively exciting the internal energy conversion process.

[0081] Furthermore, when the absorption peak positions of the two materials match, the energy transfer process between them will be more efficient, reducing the loss of energy in the transfer process. This helps to improve the energy utilization rate of the entire system, especially when the system is used for optoelectronic devices or energy conversion applications. Therefore, the basic consistency of the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film 20 and the wavelength position corresponding to the absorption spectrum peak of the lanthanide series upconversion nanomaterial film 30 is beneficial to improve the utilization rate of near-infrared light.

[0082] In the description of the present specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0083] In addition, the terms "first", "second", are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, unless otherwise explicitly specifically limited.

[0084] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A near infrared detection assembly for detecting near infrared light, characterized by The near-infrared detection assembly comprises an optical superlens, a gold nanostructure film and a lanthanide series upconversion nanomaterial film, the gold nanostructure film and the lanthanide series upconversion nanomaterial film are sequentially stacked on the light exit surface of the optical superlens, the optical superlens is used for converging the near-infrared light on the gold nanostructure film, the near-infrared detection assembly further comprises a filter, the filter is attached to the lanthanide series upconversion nanomaterial film, the focal point of the optical superlens falls on the gold nanostructure film or the lanthanide series upconversion nanomaterial film, the wavelength position corresponding to the surface plasmon resonance peak of the gold nanostructure film and the wavelength position corresponding to the absorption spectrum peak of the lanthanide series upconversion nanomaterial film are basically consistent.

2. The near infrared detection assembly of claim 1, wherein, The near-infrared detection assembly further comprises an image sensor, the image sensor is located on the side of the lanthanide series upconversion nanomaterial film away from the optical superlens, and the image sensor is used for receiving the visible light signal emitted after the near-infrared light irradiates the lanthanide series upconversion nanomaterial.

3. The near infrared detection assembly of claim 2, wherein, The filter is located between the image sensor and the lanthanide series upconversion nanomaterial film.

4. The near infrared detection assembly of claim 2, wherein, The near-infrared detection assembly further comprises a processor, and the processor is used for performing background correction on the visible light signal received by the image sensor.

5. The near infrared detection assembly of claim 1, wherein, The optical superlens comprises a substrate layer and a nanometer unit arranged on the substrate layer, and the nanometer unit is arranged in an array.

6. The near infrared detection assembly of claim 1, wherein, The gold nanostructure film is a gold nanorod film.

7. The near infrared detection assembly of claim 6, wherein, The thickness of the gold nanorod film is 10-100 nanometers.

8. A near-infrared detector, characterized by The near-infrared detection assembly comprises the near-infrared detection assembly according to any one of claims 1-7.

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