Van der Waals heterojunction negative refraction focusing device
A technology of negative refraction and heterojunction, which is applied in the field of van der Waals heterojunction negative refraction focusing devices, can solve the problems of hindering the realization of theoretical concepts, loss, and regulation of the limited dispersion relationship, so as to achieve full-angle negative refraction focusing and avoid reflection and scattering The effect of loss
Pending Publication Date: 2022-05-06
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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Problems solved by technology
However, the highly localized nature of polaritons limits the manipulation of their dispersion relations through the processing of micro-nanostructures
In addition, reflection and scattering of light by nanostructures inevitably occurs during the refraction process, resulting in huge losses and hindering the realization of theoretical concepts.
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[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0040] The purpose of the present invention is to provide a van der Waals heterojunction negative refraction focusing device, which can realize deep subwavelength negative refraction at the interface.
[0041] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0042] Suc...
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Abstract
The Van der Waals heterojunction negative refraction focusing device comprises a substrate layer, a molybdenum oxide layer and a graphene layer which are sequentially arranged from bottom to top, the metal antenna is arranged on the molybdenum oxide layer and the graphene layer; and the molybdenum oxide layer and the graphene layer form a graphene molybdenum oxide Van der Waals heterojunction. According to the invention, deep sub-wavelength negative refraction is realized through the Van der Waals heterojunction based on molybdenum oxide and graphene. No complex micro-nano machining process is needed, and reflection and scattering loss can be effectively avoided. Mixed topological polaritons formed by molybdenum oxide phonon polaritons and graphene surface plasmon polaritons can regulate and control the dispersion profile of graphene through regulation and control of graphene Fermi energy, so that deep sub-wavelength negative refraction at an interface is achieved, and on the basis, full-angle negative refraction focusing is achieved by controlling the position of the metal antenna.
Description
technical field [0001] The invention relates to the field of negative refraction focusing of polaritons, in particular to a van der Waals heterojunction negative refraction focusing device. Background technique [0002] Because the direction of refraction is opposite to that of conventional refraction, negative refraction has received extensive attention and research in optics, electronics, acoustics, and magnetism, and has great application potential in subwavelength imaging and stealth. In the past two decades, research on negative refraction has been based on metallic metamaterials and dielectric photonic crystals. These materials are composed of periodic unit cell arrays and have extraordinary optical properties that do not exist in nature. However, metamaterials are limited by their physical size, and their working range is mainly in the microwave band. Photonic crystals can manipulate light at the nanometer scale, but the processing of their periodic array structures...
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IPC IPC(8): G02B5/00G02F1/015
CPCG02B5/008G02F1/0152Y02P70/50
Inventor 戴庆胡海陈娜滕汉超
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA