Fluid refractive index detector

A refractive index and detector technology is applied in the field of fluid refractive index detectors based on the negative refraction effect of two-dimensional photonic crystals. Simple, fast response, easy to operate effect

Inactive Publication Date: 2014-02-12
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

Other methods have limitations such as many parameters to be tested, a large amount of samples to be tested, or high requirements for measuring devices.

Method used

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] figure 1 It is a structural schematic diagram of the fluid refractive index detector in this embodiment; figure 2 It is a schematic diagram of the side structure of the photonic crystal in this embodiment. Such as figure 1 , 2 As shown, the fluid detector includes: a laser 10 capable of emitting probe light with a wavelength of 1.55 μm; a photonic crystal 5 with a trapezoidal columnar structure, the photonic crystal 5 is a cylindrical silicon body 7 with a diameter of 0.2852 μm according to six The polygonal lattice is periodically arranged in it, and the lattice constant is 0.46 μm. Its outer layer is formed by sealing the photoconductor sheet 8. On the photoconductor sheet 8, there is an opening and closing opening for introducing the fluid 6 to be measured and Deriving the opening of the fluid 6 to be measured; a semiconductor optical pow...

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Abstract

A fluid refractive index detector based on two-dimensional photonic crystal negative refraction effect comprises a laser device launching detection light, a photonic crystal that enables the detection light to perform negative refraction effect once when passing through the loaded fluid to be detected and generate negative refract light on the external surface of the photonic crystal, a light power probe receiving all negative refract lights and measuring the negative refraction power of the negative refract light and a calculation part calculating the refraction of the fluid to be detected according to the negative refraction power. The fluid refraction index detector has a simple structure, small volume, high measurement accuracy, fast response speed and reliable and stable performance, is convenient for operation, and can effectively reduce the interference of stray lights.

Description

technical field [0001] A fluid refractive index detector for quickly measuring the fluid refractive index, in particular to a fluid refractive index detector based on the negative refraction effect of a two-dimensional photonic crystal. Background technique [0002] The concept of photonic crystals was first proposed in 1987. Photonic crystal is a periodic micro-dielectric structure material prepared according to the symmetry of the crystal structure, and its most basic characteristic is to have a photonic band gap. Light whose frequency is within the photonic bandgap frequency cannot propagate in photonic crystals. The negative refraction phenomenon was proposed by the Russian scientist Veselago in 1968: when light waves are incident from a material with a positive refractive index to an interface with a material with a negative refractive index, the refraction of the light wave is opposite to the conventional refraction, and the incident wave and the refracted wave are at...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41
Inventor 胡艾青梁斌明蒋强王荣张礼朝
Owner UNIV OF SHANGHAI FOR SCI & TECH
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