One-dimensional photonic crystal sun-blind ultraviolet bandpass filter

Abstract

The invention, which belongs to the optical field, puts forward a one-dimensional photonic crystal solar blind ultraviolet band-pass filter. A quantum well structure (PC1)<T>(PC2)<N>(PC3)<N>(PC4)<N>(PC5)<M> is formed by successive stacking of five kinds of photonic crystals PC1, PC2, PC3, PC4, and PC5 with increasing lattice constants; and the photonic crystals are formed by periodic arrangement of high-refractive-index material layers and low-refractive-index material layers. In each kind of photonic crystal, the thicknesses of the high-refractive-index material layers are equal and the thicknesses of the low-refractive-index material layers are identical. The cycle T of the photonic crystal PC1 is 6; the cycles N of the photonic crystals PC2, PC3, and PC4 are 3 to 6; and the cycle M of the photonic crystal PC5 is 6 to 10. The lattice constants are sums of the thicknesses of the high-refractive-index material layers and the thicknesses of the low-refractive-index material layers. According to the invention, the one-dimensional photonic crystal solar blind ultraviolet band-pass filter having a simple structure is capable of realizing solar blind ultraviolet-band high-efficiency filtering with the length of 240 to 280nm; and the deep cutting off of some ultraviolet and visible bands with the wavelength of 300 to 700 nm is realized. The one-dimensional photonic crystal solar blind ultraviolet band-pass filter can be applied to the field of ultraviolet filtering widely.

Description

technical field [0001] The invention belongs to the field of optics, in particular to a photonic crystal filter, in particular to a one-dimensional photonic crystal sun-blind ultraviolet band-pass filter. Background technique [0002] In the deep ultraviolet C-band, because 240~280nm ultraviolet light is almost absorbed by the ozone layer when it passes through the atmosphere, it cannot be detected on the surface, so it is called "solar blind zone". However, solar-blind ultraviolet signals are widely used in civilian and military fields. In addition to corona detection, guns firing, bomb explosions, fires, communications, etc. will generate solar-blind signals. Therefore, it is particularly important to improve the performance of solar-blind ultraviolet detection systems. [0003] As the core component of the ultraviolet imaging detection system, the continuous improvement of its filtering performance has become a hot issue of research. In 2014, Wang et al. (Wang, Tian-Jiao...

AI Technical Summary

Problems solved by technology

Although a good deep cut-off is achieved in the 300nm to near-infrared band after adding metal media, the transmittance of ultraviolet light in the solar-blind band is mostly not very high, so the filtering performance of solar-blind UV filter devices is not much improved.

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