33results about How to "High Refractive Index Sensitivity" patented technology

The invention provides a terahertz waveband metamaterial sensor, which comprises a dielectric layer and a sub-wavelength metal array metamaterial attached to the dielectric layer. A sub-wavelength metal array unit comprises circular resonance rings and metal strips, each circular resonance ring is provided with four openings identical in size in a skew-symmetric direction, and each metal strip ispositioned in the corresponding resonance ring and translated upwards by 1micron relative to the center of the corresponding resonance ring to form an asymmetric structure in the x direction. By introduction of the asymmetric structures, an EIT-like effect is realized, and a Q value and sensing properties of the sensor are improved. Sensitivity of the sensor is measured by translation quantity, inunit refractive index variation, of sharp transmission peak frequency generated by the EIT-like effect in a transmission spectrum, and high-sensitivity refractive index sensing in a frequency range of 400GHz-900GHz is realized.

The present invention provides a senor device based on a fiber miniature Fabry-Perot cavity. The device comprises a broadband light source, a circulator, a sensing head and a spectrum analyzer, the sensing head is composed of corrosion multi-mode fiber, microballoon and coating glue, and the coating glue is ultraviolet glue or high-temperature glue. The a multi-mode fiber end face is subjected to corrosion to obtain a taper chamber, a microballoon is inserted into the taper chamber of the corrosion multi-mode fiber, the taper chamber is sealed by using the coating glue which has one part penetrating into the taper chamber, and the microballoon and the coating glue end face form a Fabry-Perot cavity. The circulator receives light from the broadband light source and transmits the light to the sensing head, the sensing head reflects the light to the circulator, and the light is transmitted to the spectrum analyzer through the circulator to form a similar Fabry-Perot interferometer for measuring the wavelength drift of the reflection spectral signature and calculate the values of the measured enviromental parameters. The structure is compact, the manufacturing is simple and the cost is low.

The invention discloses a composite maximum-dip-angle fiber bragg grating biochemical sensor and a production method thereof. The composite maximum-dip-angle fiber bragg grating biochemical sensor comprises an optical fiber core and an optical fiber cladding, and is characterized in that a first oblique fiber bragg grating is arranged on the front section of the optical fiber core, and an angle formed between an oblique grating stripe of the first oblique bragg grating and a longitudinal axis of an optical fiber is 45 degrees; a second oblique fiber bragg grating is arranged on the front half section of the middle section of the optical fiber core, and an angle formed between an oblique grating stripe of the second oblique fiber bragg grating and the longitudinal axis of the optical fiber is 79 to 84 degrees; a fiber bragg grating is arranged on the rear half section of the middle section of the optical fiber core; the outer surfaces of the front section and the rear section of the optical fiber cladding are respectively coated with an optical fiber protective coating; the outer surface of the middle section of the optical fiber cladding is provided with a silane layer in an adsorbing manner; the outer surface of the silane layer is provided with an aptamer layer, and the aptamer layer has a selective absorption or sensitive characteristic for a target bio-molecular or a to-be-tested chemical component. The composite maximum-dip-angle fiber bragg grating biochemical sensor can be widely applied to the fields such as biology, chemical industry, medicine and life science.

The invention discloses a high sensitivity photonic crystal fiber refractive index sensor and a method for preparing the same. The sensor comprises single-mode fibers at the two ends, and a small segment of micro-tensile photonic crystal fiber which is connected with the single-mode fibers and disposed at the middle part of the sensor. The length change of the sensor after being stretched is smaller than 0.5 cm. The micro-tensile photonic crystal fiber has a solid core and an air cladding, with a length of 10-30 mm. The preparing method is that through micro stretching the photonic crystal fiber, the fiber diameter is reduced, the light field in the air is increased and the interaction between the light field and the environment is increased. The preparing method of the sensor is simple and feasible, and the sensor has a broad application prospect in fields such as optical fiber sensing. The photonic crystal fiber with a waist diameter of 30 micrometer can obtain a refractive index sensitivity of 1629.03nm/RIU at present.

The invention relates to a hybrid structure interferometer sensor for three-parameter measurement. The hybrid structure interferometer sensor comprises a first single-mode optical fiber, a coreless optical fiber microsphere cavity, a photonic crystal fiber and a second single-mode optical fiber which are sequentially welded from left to right. Through the coreless optical fiber microsphere cavityand the small section of photonic crystal fiber taper, the sensor not only has the function of a Fabry-Perot interferometer, but also has the function of a Mach-Zehnder interferometer. The interferometer sensor provided by the invention has the advantages of simple structure manufacturing, high sensitivity, good stability and the like. Meanwhile, the sensor can also measure three parameters of transverse pressure, temperature and refractive index.

The invention relates to a photoelectrode biomolecular sensor, in particular to a broadband interference type photoelectrode biomolecular sensor and method of a graphene oxide fiber bragg grating. Thesensor comprises an optical fiber core, an optical fiber cladding, an optical fiber coating layer, and a large-angle inclined fiber bragg grating arranged in the middle of the optical fiber core; coating layers of the middle section and the rear section of an optical fiber are completely removed, the tail end surface of the rear section of the optical fiber is plated with a silver reflecting film, the distance between the rear end of the large-angle inclined optical fiber grating and the silver reflecting film at the tail end of the optical fiber ranges from 30 mm to 60 mm, and an optical fiber micro Michelson interference cavity is formed. A silane layer, a nano gold shell particle layer, a graphene oxide layer and a biomolecule sensitive layer are arranged on the cladding surface from the starting end of the large-angle tilted fiber bragg grating to the tail end of the optical fiber. The photoelectrode biomolecular sensor structure can be used to increase the action distance betweenLSPR excited by a light wave evanescent place and biomolecules, is convenient to integrate and apply, has very high robustness, and can be applied to the fields of biomedicine, life science, environmental monitoring and the like.

The invention discloses a 2 [um] waveband random optical fiber laser device based on an inclined optical fiber grating, and belongs to the technical field of optical fiber laser devices. The 2 [um] waveband random optical fiber laser device is composed of a pumping source, an optical fiber combiner, an optical isolator, a wavelength division multiplexer, an optical circulator, a first double-cladding thulium-doped optical fiber, a second double-cladding thulium-doped optical fiber and an inclined optical fiber grating inscribed on the second double-cladding thulium-doped optical fiber. According to the invention, the thulium-doped optical fiber is used for providing optical gain, the inclined optical fiber grating is etched on the second double-cladding thulium-doped optical fiber, the second-order Raman light oscillation starting is restrained by using the special refractive index distribution of the inclined optical fiber grating, and the generated random laser is output through thesecond double-cladding thulium-doped optical fiber inscribed with the inclined optical fiber grating; and the 2 [um] waveband random optical fiber laser device has the advantages of being high in conversion efficiency and output power and capable of acquiring specific-wavelength random laser output.

The invention discloses an S-shaped optical fiber taper immunosensor as well as a preparation method and application thereof, and belongs to the field of optical fiber biosensors. Graphene oxide and gold nanoparticles are self-assembled to the surface of an S-shaped optical fiber taper to serve as a composite biological sensitive film; the graphene oxide is fully connected with the surface of the optical fiber, so that a biosensing supporting surface is increased, and subsequent biochemical molecular connection can be facilitated; the gold nanoparticles are combined with the graphene oxide and can also be firmly combined with a nano antibody, the effects of biological connection and signal amplification are achieved; and the two materials are combined to prepare the composite sensitive film, and the composite sensitive film is connected with the nano antibody with small volume, high affinity and strong specificity, so that specific recognition and combination of a carcino-embryonic antigen is realized,so that the effects of improving the specificity, stability and sensitivity of antigen detection are achieved. The method for preparing the optical immunosensor is simple in preparation process, low in cost and short in period; the sensitivity, specificity and stability of the immunosensor are improved, the response of theimmunosensor is fast, and label-free online detection can be achieved.

The invention discloses a thermal control multi-wave-band perfect wave absorber and application thereof. The overall structure of the thermal control multi-wave-band perfect wave absorber is composed of three layers from top to bottom, the upper layer is a square bracket indium antimonide array which is periodically arranged, the middle layer is a SiO2 medium, and the lower layer is a metal layer. At room temperature, three perfect absorption peaks can be realized at the same time by reasonably setting geometric parameters of unit structures. According to the wave absorber of the invention, the pattern structure is simple, and the perfect absorption peaks can be freely tuned from 2 to 5. The sensitive characteristic of the semiconductor indium antimonide material to the temperature is utilized, and the temperature rise can enable the whole absorption peaks to show obvious red shift. The structure of the wave absorberhas relatively high temperature sensitivity (22 GHz/K), relatively small full width at half maximum (FWHM) (0.06 THz) and relatively high refractive index sensitivity (287 GHz/RIU). The thermal control multi-band indium antimonide perfect wave absorber has a wide application prospect in the aspects of thermal control filtering, thermal biosensing, thermal imaging, detection and the like.