Visible full-band absorber based on composite structure of graphene and one-dimensional photonic crystal
A technology of one-dimensional photonic crystals and composite structures, applied in optics, instruments, optical components, etc., to achieve the effects of expanding the absorption bandwidth, enhancing the number and time of the action, and improving the absorption rate
Active Publication Date: 2021-11-30
CHANGZHOU INST OF LIGHT IND TECH +1
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[0016] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0017] The properties of graphene are mainly determined by its electrical conductivity. The Kubo model can be used to describe the size distribution of the entire band, and its surface conductivity is expressed as:
[0018]
[0019] where ω is the angular frequency of the incident light, e is the charge of the electron, h is the simple Planck constant, k B is the Boltzmann constant, T is the temperature, E f is the Fermi energy, and τ is the electron relaxation time. Graphene is a single-layer atomic structure whose thickness is less than one nanometer. For a single-layer graphene structure, the reflection and transmission behaviors experienced by electromagnetic waves incident on the graphene surface are obviously different from those of ordinary dielectric layers, so special analysis methods must be adopted. At present, resea...
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Abstract
The visible light full-band absorber based on the composite structure of graphene and one-dimensional photonic crystal has a periodic structure, and a periodic structure is formed by graphene layer G and two kinds of dielectric layers A and B alternately distributed along the z-axis, expressed as ( GAB) N , N is the number of periods, and graphene is arranged on the interface between A and B; specifically, in a periodic structure, each material layer is sequentially, a layer of graphene layer G, a layer of dielectric layer A, a layer of graphene Layer G, a dielectric layer B. The composite structure designed by the invention utilizes the unique transmission characteristics of the one-dimensional photonic crystal to greatly enhance the frequency and time of interaction between electromagnetic waves and graphene, improve the absorption rate, and expand the absorption bandwidth. By adjusting the structural parameters, the absorption spectrum is adjusted to the visible light range. The interface effect of graphene can make the absorption spectrum insensitive to the incident angle of light wave, and has wide-angle absorption characteristics. The invention realizes a visible light full-band wide-angle absorber, and provides an important reference for designing a solar absorber.
Description
technical field [0001] The invention relates to a light wave absorbing device, in particular to a visible light full-band absorber based on a compound structure of graphene and one-dimensional photonic crystal. Background technique [0002] Light wave absorbing device refers to a structure that converts incident light wave electromagnetic energy into heat energy or other forms of energy. It has a wide range of applications in the fields of solar energy collection, thermoelectric conversion, sensing, infrared detection, and thermal radiation modulation. Considering the ease of processing, the one-dimensional layered structure based on metal and dielectric is a common configuration of electromagnetic wave absorber. However, there are generally problems such as low absorption efficiency and sensitivity to the incident direction. In recent years, graphene has been widely used in the research of various optoelectronic devices due to its very unique electrical and optical propert...
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IPC IPC(8): G02B5/00
CPCG02B5/003
Inventor 朱宇光方云团
Owner CHANGZHOU INST OF LIGHT IND TECH