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High sensitivity refractive index sensor based on medium magneto-optic surface plasma resonance

A technology of refractive index sensor and surface plasmon, which is applied in the field of optical sensing, can solve the problems of large loss and limited device sensitivity, and achieve the effects of low loss, improved device sensitivity, and improved resolution

Inactive Publication Date: 2014-10-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of magnetic material has strong magnetism, it limits the further improvement of device sensitivity due to its large loss.

Method used

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  • High sensitivity refractive index sensor based on medium magneto-optic surface plasma resonance
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  • High sensitivity refractive index sensor based on medium magneto-optic surface plasma resonance

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Embodiment

[0026] Select the prism coupling structure of prism / silver / CeYIG / water (such as figure 1 shown), its parameters are as follows: the dielectric constant ε of the prism 1 =2.295, the dielectric constant of silver ε 2 =-62.485+4.331i, the dielectric constant tensor of CeYIG ϵ 3 = 5.2 - 0.0497 i - i * ( 0.26 - 0.0098 i ) 0 i * ( 0.26 - 0.0098 i ...

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Abstract

A high sensitivity refractive index sensor based on medium magneto-optic surface plasma resonance belongs to the field of optical sensing, a reflecting surface of a prism is provided with a silver layer, and the silver layer is provided with a CeYIG layer. The high sensitivity refractive index sensor can improve the sensitivity of an intensity modulation magneto-optic surface plasma resonance device by one order of magnitude, and has great commercial significance.

Description

technical field [0001] The invention belongs to the field of optical sensing. Especially related to surface plasmon resonance technology Background technique [0002] Sensors based on surface plasmon resonance (SPR) are very common sensors and are widely used in biosensing, integrated optics, and chemical sensing. Surface plasmon resonance is a collective oscillation effect of electrons and plasma on the surface of metals and media. It propagates on the surface of metals and media in the form of waves, and the propagation distance mainly depends on the loss of the metal. The principle is to use the high refractive index of the prism to couple into the surface plasmon mode (satisfying the momentum conservation k0*sin(θ)=kspp, where k0 is the free end wave loss k0=2π / λ, θ is the light incident on the prism angle, kspp is the wave loss of the surface plasmon wave, which is related to the dielectric constant of the medium and the real part of the metal dielectric constant), be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/552G01N21/41
Inventor 秦俊唐婷婷毕磊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA