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Optical Tamm state plasmon-based light refractive index sensor

A technology of plasmon and light refraction, applied in the field of optoelectronics, can solve the problem of small sensing range, achieve the effect of improving sensitivity, reducing manufacturing difficulty, wide range and high precision measurement

Active Publication Date: 2014-04-16
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most SPR-based refractive index sensors have specific requirements for incident light, and the sensing range is relatively small

Method used

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  • Optical Tamm state plasmon-based light refractive index sensor
  • Optical Tamm state plasmon-based light refractive index sensor
  • Optical Tamm state plasmon-based light refractive index sensor

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Embodiment

[0038] In this embodiment, the material of the metal thin film 1 is selected to be silver, the material of the high refractive index layer 2 is silicon, and the material of the connecting block 4 is silicon dioxide. The thickness of the metallic silver film is 50nm, next to the metallic silver film is a distributed Bragg reflector, which is composed of silicon layers and air layers alternately arranged with each other, the number of periods is 4, the thickness of the silicon layer is l / 4n, and the air layer consists of The silicon dioxide layer is etched and has a thickness of 1 / 4, where l represents the central wavelength of the distributed Bragg reflector (DBR), and n represents the refractive index of the silicon medium. In this embodiment, a metal-DBR structure is selected when the central wavelength of the distributed Bragg reflector (DBR) is 400 nm and the refractive index of silicon is 3.42.

[0039] figure 2 , image 3 Respectively, the above metal-DBR structure in ...

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Abstract

The invention discloses an optical Tamm state plasmon-based light refractive index sensor, comprising a metal film and a distributed Bragg reflector, wherein the distributed Bragg reflector comprises a plurality of layers of high refractive index layers and air layers, which are alternatively arranged; two adjacent high refractive index layers are connected through a connection block; the metal film is tightly adjacent to one side of the high refractive index layer in the distributed Bragg reflector. The optical Tamm state plasmon-based light refractive index sensor has the characteristics of being simple in structure, small in volume, easy to fabricate, easy to integrate, large in sensing range, high in sensitivity and the like; a new method is provided for development of the refractive index sensor; development of a micro-nano type light refractive index sensor with high sensitivity and wide measurement range is further promoted.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics and relates to a sensor, in particular to a photorefractive index sensor based on optical Tamm state plasmons. Background technique [0002] In recent years, optical sensors based on SPR (Surface Plasmon Resonance) have received great attention and are widely used in chemical, biological, and environmental monitoring. However, most of the refractive index sensors based on SPR have specific requirements on the incident light, and the sensing range is relatively small. [0003] Optical Tamm plasmon (OTP), as an interface mode, is analogous to the Tamm state in solid-state physics, and was first proposed by A. V. Kavokin et al. in 2005. As a special surface wave, compared with the traditional surface plasmon wave (SP), the optical Tamm state plasmon (OTP) can be excited by both transverse electric wave and transverse magnetic wave, and does not require a specific incident angle and For addi...

Claims

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Application Information

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IPC IPC(8): G01N21/41
Inventor 张伟利王芬饶云江蒋瑶
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA