Optical device and optical system

Abstract

An optical device comprises a metamaterial lens element and an imaging element. The metamaterial lens element comprises a first light conversion layer and a second light conversion layer. The first light conversion layer comprises a plurality of first medium units with a first refractive index and a plurality of second medium units with a second refractive index, wherein the first medium units and the second medium units are arranged in a staggered manner. The second light conversion layer is adjacent to the first light conversion layer. The second light conversion layer includes a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the third dielectric units and the fourth dielectric units are arranged in a staggered manner. The metamaterial lens element is arranged on the imaging element.

Description

Technical Field

[0001] The present invention relates to an optical device, and in particular to an optical device used in the field of cameras. Background Art

[0002] In the camera field, traditional optical materials often face a trade-off between refractive index and dispersion. However, optical materials with low refractive index can also easily limit the performance and design flexibility of related optical devices. Therefore, a new solution is necessary to overcome the difficulties faced by previous technologies. Summary of the Invention

[0003] In a preferred embodiment, the present invention provides an optical device comprising: a metamaterial lens element, comprising: a first light conversion layer including a plurality of first dielectric units having a first refractive index and a plurality of second dielectric units having a second refractive index, wherein the plurality of first dielectric units and the plurality of second dielectric units are arranged in an alternating manner; a second light conversion layer, adjacent to the first light conversion layer, including a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the plurality of third dielectric units and the plurality of fourth dielectric units are arranged in an alternating manner; and an imaging element, wherein the metamaterial lens element is disposed above the imaging element.

[0004] In some embodiments, when visible light is transmitted to the imaging element through the metamaterial lens element, the imaging element generates an image signal.

[0005] In some embodiments, the first refractive index is greater than the second refractive index.

[0006] In some embodiments, the third refractive index is greater than the fourth refractive index.

[0007] In some embodiments, the second refractive index is less than the fourth refractive index.

[0008] In some embodiments, the third refractive index is equal to the first refractive index.

[0009] In some embodiments, the first light conversion layer is disposed on the second light conversion layer.

[0010] In some embodiments, the plurality of third media units are substantially aligned with the plurality of second media units.

[0011] In some embodiments, the plurality of fourth media units are substantially aligned with the plurality of first media units.

[0012] In some embodiments, an operating frequency of the optical device is between 120 THz and 790 THz.

[0013] In some embodiments, the thickness of the first light conversion layer is between 0.1 times and 1 times the wavelength of the operating frequency.

[0014] In some embodiments, a length of each of the plurality of first dielectric units is between 0.1 times and 1 times the wavelength of the operating frequency.

[0015] In some embodiments, a length of each of the plurality of second dielectric units is between 0.1 times and 1 times the wavelength of the operating frequency.

[0016] In some embodiments, the thickness of the second light conversion layer is between 0.1 times and 1 times the wavelength of the operating frequency.

[0017] In some embodiments, a length of each of the plurality of third dielectric units is between 0.1 times and 1 times the wavelength of the operating frequency.

[0018] In some embodiments, a length of each of the plurality of fourth dielectric units is between 0.1 times and 1 times the wavelength of the operating frequency.

[0019] In some embodiments, each of the plurality of first dielectric units is substantially in the shape of a cube, a cuboid, a cylinder, or a prism.

[0020] In some embodiments, each of the plurality of third dielectric units is substantially in the shape of a cube, a cuboid, a cylinder, or a prism.

[0021] In another preferred embodiment, the present invention provides an optical system comprising: a plurality of metamaterial lens elements; at least one imaging element, wherein the plurality of metamaterial lens elements are disposed above the imaging element; and a substrate supporting the plurality of metamaterial lens elements and the imaging element, wherein each of the plurality of metamaterial lens elements comprises: a first light conversion layer comprising a plurality of first dielectric units having a first refractive index and a plurality of second dielectric units having a second refractive index, wherein the plurality of first dielectric units and the plurality of second dielectric units are arranged in an alternating manner; and a second light conversion layer, adjacent to the first light conversion layer, comprising a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the plurality of third dielectric units and the plurality of fourth dielectric units are arranged in an alternating manner.

[0022] In another preferred embodiment, the present invention provides an optical system comprising: a first metamaterial lens element; a first imaging element, wherein the first metamaterial lens element is disposed above the first imaging element; a second metamaterial lens element; a second imaging element, wherein the second metamaterial lens element is disposed above the second imaging element; and a multi-layer substrate supporting the first metamaterial lens element, the first imaging element, the second metamaterial lens element, and the second imaging element, wherein each of the first metamaterial lens element and the second metamaterial lens element comprises: a first light conversion layer comprising a plurality of first dielectric units having a first refractive index and a plurality of second dielectric units having a second refractive index, wherein the plurality of first dielectric units and the plurality of second dielectric units are arranged in an alternating manner; and a second light conversion layer, adjacent to the first light conversion layer, comprising a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the plurality of third dielectric units and the plurality of fourth dielectric units are arranged in an alternating manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A cross-sectional view of an optical device according to an embodiment of the present invention is shown.

[0024] Figure 2 A perspective view of a first light conversion layer according to an embodiment of the present invention is shown.

[0025] Figure 3 A perspective view of a first light conversion layer according to an embodiment of the present invention is shown.

[0026] Figure 4 A perspective view of a first light conversion layer according to an embodiment of the present invention is shown.

[0027] Figure 5 A cross-sectional view of an optical system according to an embodiment of the present invention is shown.

[0028] Figure 6 A cross-sectional view of an optical system according to an embodiment of the present invention is shown.

[0029] Explanation of symbols:

[0030] 100: Optical device

[0031] 110,511,512,513: Metamaterial lens elements

[0032] 120, 220, 320, 420: first light conversion layer 130-1, 130-2, 130-N, 230-1, 230-2, 230-N, 330-1, 330-2, 330-N, 430-1, 430-2, 430-N: first dielectric unit

[0033] 140-1,140-2,140-M,240-1,240-2,240-M,340-1,340-2,340-M,440-1,440-2,440-M: Second dielectric unit

[0034] 150: second light conversion layer

[0035] 160-1, 160-2, 160-K: Third medium unit

[0036] 170-1, 170-2, 170-R: Fourth dielectric unit

[0037] 180,580: Imaging element

[0038] 500,600: Optical system

[0039] 590:Substrate

[0040] 611: First metamaterial lens element

[0041] 612: Second metamaterial lens element

[0042] 681: First imaging element

[0043] 682: Second imaging element

[0044] 690:Multi-layer substrate

[0045] 691: First Floor

[0046] 692: Second Floor

[0047] H1,H2:Thickness

[0048] L1, L2, L3, L4: Length

[0049] N1: first refractive index

[0050] N2: Second refractive index

[0051] N3: third refractive index

[0052] N4: fourth refractive index

[0053] ST: Visible light

[0054] SM: Image signal DETAILED DESCRIPTION

[0055] In order to make the objects, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are given below and described in detail with reference to the accompanying drawings.

[0056] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not distinguish components by name, but rather by functional differences. The words "include" and "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain error range. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

[0057] The following disclosure provides many different embodiments or examples for implementing the different features of the present invention. The following disclosure describes specific examples of various components and their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the present disclosure describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, the different examples disclosed below may reuse the same reference symbols or (and) marks. These repetitions are for the purpose of simplicity and clarity, and are not intended to limit the specific relationship between the different embodiments or (and) structures discussed.

[0058] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," "upper," and similar terms are used to facilitate describing the relationship of one element or feature to another element or feature in the accompanying drawings. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the accompanying drawings. The device may be rotated 90 degrees or in other orientations, and the spatially relative terms used herein should be interpreted accordingly.

[0059] Figure 1A cross-sectional view of an optical device 100 according to an embodiment of the present invention is shown. The optical device 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer. Figure 1 As shown, the optical device 100 includes a metamaterial lens element 110 and an imaging element 180. It should be understood that although not shown in FIG. Figure 1 However, the optical device 100 may further include other components, such as a processor, a battery element, or (and) a housing.

[0060] The metamaterial lens element 110 includes a first light conversion layer (LTL) 120 and a second light conversion layer 150, wherein the second light conversion layer 150 is adjacent to the first light conversion layer 120. It should be noted that the terms "adjacent" or "adjacent" in this specification may refer to a situation where the distance between the two corresponding elements is less than a predetermined distance (e.g., 10 mm or less), and may also include a situation where the two corresponding elements are in direct contact with each other (i.e., the aforementioned distance is shortened to 0). In some embodiments, the first light conversion layer 120 is disposed on the second light conversion layer 150, and the two may be directly bonded to each other. In other embodiments, the metamaterial lens element 110 may further include more light conversion layers (not shown).

[0061] The first light conversion layer 120 can be considered a first periodic structure. Specifically, the first light conversion layer 120 includes a plurality of first dielectric units 130-1, 130-2, ..., 130-N and a plurality of second dielectric units 140-1, 140-2, ..., 140-M, where "N" and "M" can both be positive integers greater than or equal to 3. Within the first light conversion layer 120, the plurality of first dielectric units 130-1, 130-2, ..., 130-N and the plurality of second dielectric units 140-1, 140-2, ..., 140-M are arranged in an alternating pattern. In some embodiments, the first dielectric units 130-1, 130-2, ..., 130-N each have a first refractive index N1, and the second dielectric units 140-1, 140-2, ..., 140-M each have a second refractive index N2, where the second refractive index N2 may be different from the first refractive index N1. For example, the first refractive index N1 may be greater than the second refractive index N2, but this is not limited thereto.

[0062] The second light conversion layer 150 can be considered a second periodic structure. Specifically, the second light conversion layer 150 includes a plurality of third dielectric units 160-1, 160-2, ..., 160-K and a plurality of fourth dielectric units 170-1, 170-2, ..., 170-R, where "K" and "R" can both be positive integers greater than or equal to 3. Within the second light conversion layer 150, the plurality of third dielectric units 160-1, 160-2, ..., 160-K and the plurality of fourth dielectric units 170-1, 170-2, ..., 170-R are arranged in an alternating pattern. In some embodiments, the plurality of third dielectric units 160-1, 160-2, ..., 160-K each have a third refractive index N3, while the plurality of fourth dielectric units 170-1, 170-2, ..., 170-R each have a fourth refractive index N4, where the fourth refractive index N4 can be different from the third refractive index N3. For example, the third refractive index N3 may be greater than the fourth refractive index N4, but is not limited thereto.

[0063] In some embodiments, the plurality of third dielectric units 160-1, 160-2, ..., 160-K of the second light conversion layer 150 may be substantially aligned with the plurality of second dielectric units 140-1, 140-2, ..., 140-M of the first light conversion layer 120. It should be understood that the shapes and distribution of the plurality of second dielectric units 140-1, 140-2, ..., 140-M and the plurality of third dielectric units 160-1, 160-2, ..., 160-K are not particularly limited in the present invention.

[0064] In some embodiments, the plurality of fourth dielectric units 170-1, 170-2, ..., 170-R of the second light conversion layer 150 may be substantially aligned with the plurality of first dielectric units 130-1, 130-2, ..., 130-N of the first light conversion layer 120. It should be understood that the shapes and distribution of the plurality of first dielectric units 130-1, 130-2, ..., 130-N and the plurality of fourth dielectric units 170-1, 170-2, ..., 170-R are not particularly limited in the present invention.

[0065] For example, the imaging element 180 may include an array (not shown) composed of multiple charge-coupled devices (CCDs), but is not limited thereto. The metamaterial lens element 110 is disposed above the imaging element 180. Generally speaking, when visible light ST is transmitted to the imaging element 180 via the metamaterial lens element 110, the imaging element 180 generates an image signal SM based on the visible light ST. Thus, the optical device 100 can provide a camera function. According to actual measurement results, the metamaterial lens element 110 has a sufficient equivalent refractive index, which can be used to fine-tune the direction and phase of the visible light ST. Due to the lightweight and thin nature of the metamaterial lens element 110, the overall size of the optical device 100 using the metamaterial lens element 110 can be significantly reduced. Furthermore, because the metamaterial lens element 110 does not include any metal components, its energy loss is almost negligible.

[0066] In some embodiments, an operating frequency of the optical device 100 is between 120 THz and 790 THz. In addition, the frequency of the visible light ST may also fall within the aforementioned range of the operating frequency of the optical device 100.

[0067] In some embodiments, the component dimensions and component parameters of the optical device 100 may be as follows: The thickness H1 of the first light conversion layer 120 may be between 0.1 times and 1 times the wavelength of the operating frequency of the optical device 100 (λ / 10 to 1λ). The length L1 of each of the plurality of first dielectric units 130-1, 130-2, ..., 130-N may be between 0.1 times and 1 times the wavelength of the operating frequency of the optical device 100 (λ / 10 to 1λ). The length L2 of each of the plurality of second dielectric units 140-1, 140-2, ..., 140-M may be between 0.1 times and 1 times the wavelength of the operating frequency of the optical device 100 (λ / 10 to 1λ), for example, approximately 0.25 times the wavelength (λ / 4). The thickness H2 of the second light conversion layer 150 may be between 0.1 times and 1 times the wavelength of the operating frequency of the optical device 100 (λ / 10 to 1λ). The length L3 of each of the plurality of third dielectric units 160-1, 160-2, ..., 160-K may be between 0.1 times and 1 times the wavelength (λ / 10 to 1λ) of the operating frequency of the optical device 100. The length L4 of each of the plurality of fourth dielectric units 170-1, 170-2, ..., 170-R may be between 0.1 times and 1 times the wavelength (λ / 10 to 1λ) of the operating frequency of the optical device 100, for example, approximately 0.25 times the wavelength (λ / 4). The second refractive index N2 may be less than the fourth refractive index N4. The third refractive index N3 may be equal to the first refractive index N1. The above component dimensions and component parameter ranges were determined based on multiple experimental results and help maximize the equivalent refractive index of the optical device 100 while minimizing the overall size of the optical device 100.

[0068] In some embodiments, the material of any one of the plurality of first dielectric units 130-1, 130-2, ..., 130-N, the plurality of second dielectric units 140-1, 140-2, ..., 140-M, the plurality of third dielectric units 160-1, 160-2, ..., 160-K, and the plurality of fourth dielectric units 170-1, 170-2, ..., 170-R may be selected from the following elements or compounds: gallium nitride (GaN), silicon (Si), germanium ( The present invention relates to a novel nanostructured carbon nanotube (CMOS) nanostructured carbon nanotube (CMOS) nanostructured carbon nanotube (CMOS), wherein the refractive index of gallium nitride may be approximately 2.4, the refractive index of silicon may be approximately 3.5, the refractive index of germanium may be approximately 4, the refractive index of cadmium selenide may be approximately 2.5, the refractive index of zinc sulfide may be approximately 2.3, the refractive index of silicon dioxide may be approximately 1.45, the refractive index of aluminum oxide may be approximately 1.76, and the refractive index of silicon nitride may be approximately 2.

[0069] In some embodiments, the first dielectric elements 130-1, 130-2, ..., 130-N may be made of gallium nitride (GaN). The second dielectric elements 140-1, 140-2, ..., 140-M may be gaps (which may be filled with air). The third dielectric elements 160-1, 160-2, ..., 160-K may also be made of GaN. The fourth dielectric elements 170-1, 170-2, ..., 170-R may be made of silicon dioxide (SiO). According to actual measurement results, this design also helps suppress undesirable chromatic aberration and spectral aberration in the optical device 100.

[0070] The following embodiments will introduce different configurations and detailed structural features of the optical device 100. It should be understood that these drawings and descriptions are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0071] Figure 2 A perspective view of the first light conversion layer 220 according to an embodiment of the present invention is shown, wherein the first light conversion layer 220 can be applied to the aforementioned optical device 100 and can provide similar effects. Figure 2 In an embodiment, the first light conversion layer 220 includes a plurality of first dielectric units 230-1, 230-2, ..., 230-N and a plurality of second dielectric units 240-1, 240-2, ..., 240-M, wherein the plurality of second dielectric units 240-1, 240-2, ..., 240-M may be connected to each other, and the plurality of first dielectric units 230-1, 230-2, ..., 230-N may be periodically embedded in the plurality of second dielectric units 240-1, 240-2, ..., 240-M. For example, each of the plurality of first dielectric units 230-1, 230-2, ..., 230-N may be substantially in the form of a cube or a cuboid. In other embodiments, Figure 2 It can also be used to describe the structure of a second light conversion layer, wherein each of the plurality of third dielectric units of the second light conversion layer can also be substantially in the form of a cube or a cuboid.

[0072] Figure 3 A perspective view of the first light conversion layer 320 according to an embodiment of the present invention is shown, wherein the first light conversion layer 320 can be applied to the aforementioned optical device 100 and can provide similar effects. Figure 3In some embodiments, the first light conversion layer 320 includes a plurality of first dielectric units 330-1, 330-2, ..., 330-N and a plurality of second dielectric units 340-1, 340-2, ..., 340-M, wherein the plurality of second dielectric units 340-1, 340-2, ..., 340-M may be connected to each other, and the plurality of first dielectric units 330-1, 330-2, ..., 330-N may be periodically embedded in the plurality of second dielectric units 340-1, 340-2, ..., 340-M. For example, each of the plurality of first dielectric units 330-1, 330-2, ..., 330-N may be substantially cylindrical. In other embodiments, Figure 3 It can also be used to describe the structure of a second light conversion layer, wherein each of the plurality of third dielectric units of the second light conversion layer can also be substantially cylindrical.

[0073] Figure 4 A perspective view of a first light conversion layer 420 according to an embodiment of the present invention is shown, wherein the first light conversion layer 420 can be applied to the aforementioned optical device 100 and can provide similar effects. Figure 4 In some embodiments, the first light conversion layer 420 includes a plurality of first dielectric units 430-1, 430-2, ..., 430-N and a plurality of second dielectric units 440-1, 440-2, ..., 440-M, wherein the plurality of second dielectric units 440-1, 440-2, ..., 440-M may be connected to each other, and the plurality of first dielectric units 430-1, 430-2, ..., 430-N may be periodically embedded in the plurality of second dielectric units 440-1, 440-2, ..., 440-M. For example, each of the plurality of first dielectric units 430-1, 430-2, ..., 430-N may be substantially in the shape of a prism. In other embodiments, Figure 4 It can also be used to describe the structure of a second light conversion layer, wherein each of the plurality of third dielectric units of the second light conversion layer can also be approximately in the form of a prism.

[0074] Figure 5 A cross-sectional view of an optical system 500 according to an embodiment of the present invention is shown. Figure 5 and Figure 1 Similar. Figure 5In the embodiment of the present invention, the optical system 500 includes a plurality of metamaterial lens elements 511, 512, 513, at least one imaging element 580, and a substrate 590. The detailed structure of each of the plurality of metamaterial lens elements 511, 512, 513 can be as described in the previous embodiment and will not be repeated here. The plurality of metamaterial lens elements 511, 512, 513 are disposed on the imaging element 580. The substrate 590 can be used to support the plurality of metamaterial lens elements 511, 512, 513 and the imaging element 580. In other embodiments, the optical system 500 may further include more metamaterial lens elements and more imaging elements corresponding to these metamaterial lens elements. It should be understood that the plurality of metamaterial lens elements 511, 512, 513 can be regarded as different regions of the optical system 500, and their equivalent refractive index can be adjusted according to different needs. Figure 5 The remaining features of the optical system 500 are similar to Figure 1 The optical device 100 is similar, so both embodiments can achieve similar operating effects.

[0075] Figure 6 A cross-sectional view of an optical system 600 according to an embodiment of the present invention is shown. Figure 6 and Figure 1 Similar. Figure 6 In the embodiment, the optical system 500 includes a first metamaterial lens element 611, a second metamaterial lens element 612, a first imaging element 681, a second imaging element 682, and a multilayer substrate 690. The detailed structures of each of the first metamaterial lens element 611 and the second metamaterial lens element 612 can be as described in the previous embodiment and will not be repeated here. The first metamaterial lens element 611 is disposed on the first imaging element 681. The second metamaterial lens element 612 is disposed on the second imaging element 682. The multilayer substrate 690 includes at least a first layer 691 and a second layer 692, which are parallel to each other. The first layer 691 can be used to support the first metamaterial lens element 611 and the first imaging element 681, while the second layer 692 can be used to support the second metamaterial lens element 612 and the second imaging element 682. In other embodiments, the optical system 600 may further include more metamaterial lens elements and more imaging elements, which may be supported by different layers of the multilayer substrate 690. It should be understood that the first metamaterial lens element 611 and the second metamaterial lens element 612 can be considered different regions of the optical system 600, and their equivalent refractive indices can be adjusted according to different requirements. In addition, by using a multi-layer substrate 690, the design flexibility of the optical system 600 can be further improved. Figure 6 The remaining features of the optical system 600 are similar to those of Figure 1 The optical device 100 is similar, so both embodiments can achieve similar operating effects.

[0076] The present invention provides a novel optical device and optical system. Compared with conventional designs, the present invention has at least the advantages of miniaturized overall size and improved equivalent refractive index, and is therefore very suitable for application in various devices.

[0077] It is worth noting that the above-mentioned element dimensions and element parameters are not limiting conditions of the present invention. Designers can adjust these setting values ​​according to different needs. The optical device and optical system of the present invention are not limited to Figure 1-6 The present invention may only include Figure 1-6 In other words, not all of the features shown need to be implemented in the optical device and optical system of the present invention at the same time.

[0078] In this specification and claims, ordinal numbers, such as "first," "second," "third," etc., have no sequential relationship with each other and are only used to distinguish two different components with the same name.

[0079] Although the present invention is disclosed above with reference to preferred embodiments, they are not intended to limit the scope of the invention. Anyone skilled in the art may make slight changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical device comprising: A metamaterial lens element, comprising: a first light conversion layer comprising a plurality of first dielectric units having a first refractive index and a plurality of second dielectric units having a second refractive index, wherein the plurality of first dielectric units and the plurality of second dielectric units are arranged alternately with each other; and a second light conversion layer, adjacent to the first light conversion layer, and comprising a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the plurality of third dielectric units and the plurality of fourth dielectric units are arranged alternately with each other; and An imaging element, wherein the metamaterial lens element is disposed on the imaging element.

2. The optical device as claimed in claim 1, wherein when a visible light is transmitted to the imaging element through the metamaterial lens element, the imaging element generates an image signal. The optical device of claim 1 , wherein the first refractive index is greater than the second refractive index. The optical device of claim 1 , wherein the third refractive index is greater than the fourth refractive index. The optical device of claim 1 , wherein the second refractive index is smaller than the fourth refractive index. The optical device of claim 1 , wherein the third refractive index is equal to the first refractive index. The optical device of claim 1 , wherein the first light conversion layer is disposed on the second light conversion layer.

8. The optical device according to claim 1, wherein the plurality of third dielectric units are substantially aligned with the plurality of second dielectric units, respectively.

9. The optical device according to claim 1, wherein the plurality of fourth dielectric units are substantially aligned with the plurality of first dielectric units, respectively. 10 . The optical device as claimed in claim 1 , wherein an operating frequency of the optical device is between 120 THz and 790 THz. The optical device of claim 10 , wherein a thickness of the first light conversion layer is between 0.1 and 1 times the wavelength of the operating frequency. 12 . The optical device of claim 10 , wherein a length of each of the plurality of first dielectric units is between 0.1 and 1 wavelength of the operating frequency. 13 . The optical device of claim 10 , wherein a length of each of the plurality of second dielectric units is between 0.1 and 1 wavelength of the operating frequency. The optical device of claim 10 , wherein a thickness of the second light conversion layer is between 0.1 and 1 times the wavelength of the operating frequency. 15 . The optical device of claim 10 , wherein a length of each of the plurality of third dielectric units is between 0.1 and 1 wavelength of the operating frequency. 16 . The optical device of claim 10 , wherein a length of each of the plurality of fourth dielectric units is between 0.1 and 1 wavelength of the operating frequency. 17 . The optical device as claimed in claim 1 , wherein each of the plurality of first dielectric units is substantially in the shape of a cube, a cuboid, a cylinder, or a prism. 18 . The optical device as claimed in claim 1 , wherein each of the plurality of third dielectric units is substantially in the shape of a cube, a cuboid, a cylinder, or a prism.

19. An optical system comprising: multiple metamaterial lens elements; at least one imaging element, wherein the plurality of metamaterial lens elements are disposed on the imaging element; as well as a substrate carrying the plurality of metamaterial lens elements and the imaging element, wherein each of the plurality of metamaterial lens elements comprises: a first light conversion layer comprising a plurality of first dielectric units having a first refractive index and a plurality of second dielectric units having a second refractive index, wherein the plurality of first dielectric units and the plurality of second dielectric units are arranged alternately with each other; as well as A second light conversion layer is adjacent to the first light conversion layer and includes a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the plurality of third dielectric units and the plurality of fourth dielectric units are arranged alternately.

20. An optical system comprising: a first metamaterial lens element; a first imaging element, wherein the first metamaterial lens element is disposed on the first imaging element; a second metamaterial lens element; a second imaging element, wherein the second metamaterial lens element is disposed on the second imaging element; as well as a multi-layer substrate carrying the first metamaterial lens element, the first imaging element, the second metamaterial lens element, and the second imaging element, wherein each of the first metamaterial lens element and the second metamaterial lens element comprises: a first light conversion layer comprising a plurality of first dielectric units having a first refractive index and a plurality of second dielectric units having a second refractive index, wherein the plurality of first dielectric units and the plurality of second dielectric units are arranged alternately with each other; as well as A second light conversion layer is adjacent to the first light conversion layer and includes a plurality of third dielectric units having a third refractive index and a plurality of fourth dielectric units having a fourth refractive index, wherein the plurality of third dielectric units and the plurality of fourth dielectric units are arranged alternately.

Images