Full visible light waveband omnidirectional reflector based on photonic crystals

Abstract

The invention discloses a full visible light waveband omnidirectional reflector based on photonic crystals. The full visible light waveband omnidirectional reflector is formed by overlapping two photonic crystals with different structures and same lattice constant, and is in a structure of [A / B]m[C / D]n, wherein a first photonic crystal has the material A with a dielectric constant of 1.96 and the material B with a dielectric constant of 16; in a single period, a width d1 of the material A is 0.74d, and a width d2 of the material B is 0.26d; a second photonic crystal has the material C with a dielectric constant of 1.96 and the material D with a dielectric constant of 16; and in the single period, a width d3 of the material C is 0.5d, and a width d4 of the material D is 0.5d. The omnidirectional reflector provided by the invention has the advantages of simple structure and easiness of preparation, and can realize omnidirectional reflection of a full visible light waveband with a wavelength of 384-768 nm. Furthermore, the reflectivity can reach to be more than 99.9%.

Description

technical field [0001] The invention relates to a photonic crystal reflector, in particular to a photonic crystal reflector capable of full-angle reflection in all visible light bands. Background technique [0002] As a new type of optoelectronic functional material, photonic crystal has attracted much attention because of its good optical properties. Compared with two-dimensional and three-dimensional photonic crystals, one-dimensional photonic crystals are favored by people because of their simple structure and easier technical realization. Complete photonic band gap is one of the main characteristics of photonic crystals, that is, when light of a specific frequency passes through the photonic crystal, due to optical effects such as interference, the light cannot pass through the photonic crystal, thereby forming a forbidden band; while light of some frequencies can pass, Form the conduction band. Since the materials used in photonic crystals are non-metallic crystal mat...

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Problems solved by technology

[0003] R. Jomtaraka et al. (Geometrically Distributed 1D Photonic Crystals for Light-Reflection in All Angles, SciVerse Sciencedirect. 2012, 32, 455-460) mentioned the use of one-dimensional photonic crystals whose periods are distributed in geometric progression to widen the band gap method, but this method is not highly targeted, and requires a large number of crystal periodic layers, and the actual production is complicated

[0004] Han Peide et al. (Omni-directional mirror for visible light based on one-dimensional photonic crystal, CHINESE OPTICS LETTERS. 2011, 9(7), 071603) mentioned the use of (AB)m / (CD)n / (EF)l / ( MN)s structure realizes the method of all-angle reflector in the full visible light band, but this method needs to be composed of photonic crystals with three different structures, and the structure is more complicated. When the light is incident at greater than 60°, the TM mode light in the visible light band will not be able to full reflection

[0005] Gu Peifu et al. (Thin-film photonic crystal full-angle reflector for visible light region, Acta Physica Sinica. 2005, 54(8)) mentioned using the method of angular domain superposition to realize full-visible light band full-angle reflector, but this method has not yet Complete coverage of the entire visible light band

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