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Lithium niobate optical sensor and method based on Bloch surface waves

An optical sensor, lithium niobate technology, applied in the field of optical technology science, can solve the problems of low sensor sensitivity and only sensor sensitivity, and achieve the effect of simple production, real-time and repeatable detection

Active Publication Date: 2021-03-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chen Ying et al. (Semi-infinite photonic crystal Tamm state with porous silicon surface defect cavity and its refractive index sensing mechanism, Acta Physica Sinica, 2014) proposed a refractive index sensor structure based on porous silicon surface defect photonic crystal Tamm state, but the sensor The sensitivity is low, only 546.67nm / RIU
Jiawei Cong (Sub-nanometer linewidth perfect absorption in visible bandinduced by Bloch surface wave, OpticalMaterials, 2016) proposed a composite structure of photonic crystal and silver thin layer to excite BSW, but its sensing sensitivity is only 263nm / RIU

Method used

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  • Lithium niobate optical sensor and method based on Bloch surface waves
  • Lithium niobate optical sensor and method based on Bloch surface waves
  • Lithium niobate optical sensor and method based on Bloch surface waves

Examples

Experimental program
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Embodiment 1

[0035] In this example, the high refractive index material in the periodic photonic crystal 2 selects n H = 2.15 titanium dioxide (TiO 2 ), the low refractive index material is selected with a refractive index n L =1.32 silicon dioxide (SiO 2 ), the periodic photonic crystal 2 is formed by periodic arrangement of titanium dioxide and silicon dioxide, and the thickness is d H = 151nm and d L =246nm, periodicity N=9. The defect layer consists of thickness h Top =55nm lithium niobate absorption medium composition. The overall structure of the device is: BK7 prism - one-dimensional photonic crystal - lithium niobate defect layer - sample layer to be tested. In this case we set the refractive index of the external medium around its initial value n air The change of = 1.001 (air) was detected and analyzed by passing the gas through the microfluidic device and flowing over the sensor surface. The wavelength interrogation method is adopted, that is, a fixed incident angle of 4...

Embodiment 2

[0037] In this example, the high refractive index material H in the periodic photonic crystal 2 selects n H = 2.15 titanium dioxide (TiO 2 ), the low refractive index material L selects the refractive index n L =1.32 silicon dioxide (SiO 2 ), the periodic photonic crystal 2 is formed by periodic arrangement of titanium dioxide and silicon dioxide, and the thickness is d H = 151nm and d L =246nm, periodicity N=9. The defect layer consists of thickness h Top =55nm lithium niobate absorption medium composition. The overall structure of the device is: BK7 prism - one-dimensional photonic crystal - lithium niobate defect layer - sample layer to be tested. In this case we set the refractive index of the external medium around its initial value n air The change of = 1.001 (air) was detected and analyzed by passing the gas through the microfluidic device and flowing over the sensor surface. The azimuth interrogation method is adopted, that is, a fixed incident angle of 44.97° ...

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Abstract

The invention provides a lithium niobate optical sensor and method based on Bloch surface waves. The lithium niobate optical sensor sequentially comprises an optical prism, a periodic photonic crystaland a lithium niobate light absorption dielectric layer from bottom to top. The periodic photonic crystal is formed by alternately arranging a high-refractive-index material and a low-refractive-index material for N periods. The BSW is excited through the multilayer film structure, and an electric field which is strong enough is formed at the light absorption dielectric layer, so that the lithiumniobate can strongly absorb light waves with the frequency of the BSW, and a resonance peak is formed in a reflection spectrum. A relationship between the formant wavelength or azimuth angle and therefractive index of the to-be-detected sample is established, and dynamic detection and qualitative analysis of the refractive index of the to-be-detected sample are realized by detecting the drift ofthe formant wavelength or angle. The sensor is simple to manufacture, can detect an object to be detected repeatedly in real time, and is a photonic crystal refractive index sensor with high sensitivity and high quality factor.

Description

technical field [0001] The invention belongs to the field of optical technology science, and in particular relates to a lithium niobate optical sensor and method based on Bloch surface waves. Background technique [0002] The optical refractive index sensor is a multidisciplinary field such as optics, solid state physics, microelectronics science, and materials science. Specifically, it detects the concentration and tissue composition of the sample by changing the refractive index of the sample to be tested. The quantity is converted into a changing light signal through a specific response in the sensor, and the light signal is detected to reflect the change of the measured object. This sensor has the characteristics of fast detection, high sensitivity and strong anti-interference ability, and has a wide range of applications in food safety, medical diagnosis, environmental detection and national defense technology. [0003] In recent decades, label-free optical detection m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G01N21/552
CPCG01N21/41G01N21/553Y02P70/50
Inventor 葛道晗周宇杰张立强丁建宁张祯杨平
Owner JIANGSU UNIV
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