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Surface detect cavity photonic crystal refractive index sensor containing absorption medium graphene

A technology of refractive index sensor and photonic crystal, which is applied in the field of optical sensing, can solve the problems of poor stability and low detection accuracy of sensors, and achieve the effects of low cost, high sensitivity and strong repeatability

Inactive Publication Date: 2016-10-26
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a photonic crystal refractive index sensor that is easy to manufacture, has strong repeatability in detection of the object to be tested, and has high sensitivity and high Q value, so as to solve the problems of low detection accuracy and poor stability of current sensors, and can realize High-precision detection of low concentration and small molecule samples

Method used

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  • Surface detect cavity photonic crystal refractive index sensor containing absorption medium graphene
  • Surface detect cavity photonic crystal refractive index sensor containing absorption medium graphene
  • Surface detect cavity photonic crystal refractive index sensor containing absorption medium graphene

Examples

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Embodiment 1

[0027] In this example, the refractive index of the high refractive index material A in the periodic photonic crystal 2 is n A =2.65 silicon carbide, low refractive index material B selects refractive index n B =1.38 magnesium fluoride, periodic photonic crystal 2 is formed by periodic arrangement of silicon carbide and magnesium fluoride, and the thickness is d respectively A =77nm and d B =147nm, the number of cycles n=3. The surface defect cavity 1 has a thickness of d 1 = 15nm and d 2 = 31nm two layers of magnesium fluoride (low refractive index material B) and the absorption medium graphene C, the absorption medium graphene C is placed between the two layers of magnesium fluoride, the number of layers is n c = 1, its structural composition is magnesium fluoride-graphene-magnesium fluoride. The NaCl solution with the concentration of c1=38% and c2=40% is selected as the sample to be tested and analyzed. The NaCl solution flows through the surface of the sensor through a micro...

Embodiment 2

[0029] In this example, the refractive index of the high refractive index material A in the periodic photonic crystal 2 is n A =2.65 titanium dioxide, low refractive index material B selects refractive index n B =1.38 silicon dioxide, periodic photonic crystal 2 is formed by periodic arrangement of titanium dioxide and silicon dioxide, and the thickness is d respectively A =77nm and d B =147nm, the number of cycles n=3. The surface defect cavity 1 has a thickness of d 1 = 13nm and d 2 = 30nm two layers of silicon dioxide (low refractive index material B) and the absorption medium graphene C are composed, and the absorption medium graphene C is placed between the two layers of silicon dioxide. Its structural composition is silica-graphene-silica, and the number of graphene layers of the absorption medium is n c = 1. The NaCl solution with the concentration of c1=40% and c2=38% is selected as the sample to be tested and analyzed. The NaCl solution flows through the surface of the ...

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Abstract

The invention discloses a surface defect cavity photonic crystal refractive index sensor containing absorption medium graphene. The sensor consists of a surface defect cavity (1), a periodic photonic crystal (2) and a coupling prism (3), wherein the periodic photonic crystal is formed by periodically alternatively arranging a high refractive index material (A) and a low refractive index material (B); the surface defect cavity consists of absorption medium graphene (C) and the low refractive index material (B), and the structure of the surface defect cavity is (B)-(C)-(B). The defect cavity is used for substituting a gold membrane (or silver membrane) in a traditional SPR sensor, and the absorption medium graphene is introduced into the defect cavity, so that a resonant optical signal formed in the defect cavity is gradually absorbed to form ring down, and a defect peak corresponding to the resonant wavelength is acquired in a reflective spectrum. A relationship of the resonant peak wavelength and the refractive index of a sample to be detected is established, and the refractive index of the sample to be detected is dynamically monitored by defecting the drifting of the resonant peak wavelength.

Description

Technical field [0001] The invention relates to the technical field of optical sensing, in particular to a surface defect cavity photonic crystal refractive index sensor containing graphene as an absorption medium. Background technique [0002] The optical refractive index sensor is a product of the cross-combination of optics, electromagnetics, and microelectronics. It is a sensing device that detects various information such as sample concentration and composition by modulating the refractive index of the sample to be measured. With the characteristics of high sensitivity, rapid detection and strong anti-interference ability, it is widely used in food safety, environmental monitoring, and defense technology. [0003] At present, the most common application is the surface plasmon resonance (SPR) optical refractive index sensor. It uses gold film or silver film to excite surface plasmon waves as the detection surface, which has the characteristics of fast detection speed and high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G02B6/122
CPCG01N21/4133G02B6/1225
Inventor 陈颖赵志勇朱奇光罗佩田亚宁刘晓飞
Owner YANSHAN UNIV
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