Gas refractive index detector based on two-dimensional photonic crystal
A technology of gas refractive index and photonic crystal, which is applied in the measurement of phase influence characteristics, etc., can solve the problems of low intensity, low resolution, cavity length and other problems of optical fiber F-P interference sensor, and achieve the effect of stable structure, small volume and effective detection
Inactive Publication Date: 2015-05-13
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
However, the fiber-optic F-P interference sensor has low intensity, relatively short cavity length, low resolution and large error, which are limited in practical applications.
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[0023] figure 1 It is a schematic plan view of the photonic crystal part of the gas refractive index detector according to the embodiment of the present invention.
[0024] Such as figure 1 As shown in , the photonic crystal gas refractive index detector 10 in the embodiment of the present invention has a photonic crystal 11. The photonic crystal 11 is composed of dielectric columns 12, and is arranged in the form of a lattice in a two-dimensional space. The arrangement of the dielectric columns is The included angle α of the vectors between adjacent media columns is 90°. The distance between the dielectric pillars 12 is d=0.55 μm, which is the lattice constant of the photonic crystal 11 . The dielectric columns 12 have a radius of r=0.2d=0.11 μm and are arranged in a square shape. In this embodiment, the material of the dielectric columns 12 is silicon. Photonic crystals can be made of solid cylinders or air holes. In this embodiment, solid dielectric cylinders are used. ...
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Abstract
The present invention relates to a gas refractive index detector based on two-dimensional photonic crystals. The gas refractive index detector includes: dielectric columns. The dielectric columns are arranged in lattice form in two-dimensional space to form a photonic crystal. The photonic crystal includes line defects in horizontal and vertical directions. The two line defects present cross-shaped waveguide structure channels, and separate the photonic crystals into a plurality of symmetrical blocks. Each photonic crystal includes a pair of point defect groups. The point defect groups are oppositely disposed on the channel formed by the line defect. The photonic crystal is correspondingly provided with an output end and is provided with an input end. The output end is provided with an optical power detector and the input end is provided with a laser emitter. The photonic crystals are included in a gas chamber. The refractive index of gas to be detected is obtained by calculating the ratio of luminous power of two ends of the output end by a calculation portion. The gas refractive index detector has the characteristics of wide detection range, small size, duplicate detection and fast response, and has broad application in rapid detection field.
Description
technical field [0001] The invention relates to a gas refraction index detector, in particular to a gas refraction index detector based on a photonic crystal cross-shaped line defect waveguide. technical background [0002] Photonic crystals have achieved tremendous development from 1998 to the present, and more and more scientists and entrepreneurs have begun to pay attention to the development of photonic crystals. Two-dimensional photonic crystals have attracted attention in various studies due to their relative ease of fabrication and their many optical properties. An important characteristic of photonic crystals is the existence of a photonic band gap. After introducing defects into the photonic crystal, the photonic crystal can be controlled due to the appearance of defect modes. For example, a resonant cavity can be realized by introducing a point defect group, and a photonic crystal waveguide can be realized by introducing a line defect. Photonic crystals have gre...
Claims
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IPC IPC(8): G01N21/41
Inventor 梁斌明胡艾青蒋强朱幸福湛胜高王荣
Owner UNIV OF SHANGHAI FOR SCI & TECH