Spectrum selective absorber based on single-layer graphene and Bragg grating

Abstract

The invention provides an ultra-narrow-band TE polarization spectrum selective absorber based on a single-layer graphene and a Bragg grating. The absorber comprises a dielectric grating layer, the single-layer graphene and a Bragg grating layer; wherein the dielectric grating layer, the single-layer graphene and the Bragg grating layer are successively arranged from top to bottom. The period, the ridge width and the thickness of the dielectric grating layer are respectively 574-576 nanometers, 548-550 nanometers and 219-221 nanometers. The Bragg grating layer is composed of at least 20 pairs of low-refractivity dielectric panels and high-refractivity dielectric panels. The thickness of each low-refractivity dielectric panel is 340-350 nanometers, and the thickness of each high-refractivity dielectric panel is 165-175 nanometers. The spectrum selective absorber can be manufactured according to optical holographic recording technology or electron-beam direct-writing device and micro-electron deep-etching process. The ultra-narrow-band TE polarization spectrum selective absorber has advantages of convenient material acquisition, low manufacture cost, large-batch production and important use prospect.

Description

technical field [0001] This patent relates to a graphene-based ultra-narrow-band spectrally selective absorber, especially an ultra-narrow-band TE polarization spectrally selective absorber based on a graphene monolayer and a Bragg grating for optical communication bands. Background technique [0002] In recent years, graphene has been extensively studied due to its unique electrical, optical, mechanical, and thermal properties. As an ultrathin two-dimensional carbon-based material just discovered a few years ago, graphene has been applied in many fields, such as optical modulators, absorbers, imaging devices, photodetectors and broadband polarizers, etc. Since the graphene monolayer is only a single atomic layer thick, the main challenge in these applications is how to enhance the interaction between light and graphene, so how to realize the complete light absorption of the graphene monolayer has become a trend. [0003] In the mid-to-far infrared band, graphene has two im...

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Problems solved by technology

Hu et al. explored the enhanced absorption phenomenon in graphene nanostrips based on a multilayer grating structure, but complete light absorption can only be achieved when light is non-normally incident [Prior Art 5: Hu, et al., Appl. Phys. Lett.105, 221113 (2014)】

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