Graphene electrode-based lithium niobate metasurface spatial light modulator

A technology of spatial light modulator and graphene electrode, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of low speed, large volume, temperature and other performance limitations, and achieve the effect of adjustable absorption

Pending Publication Date: 2022-01-07
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the mainstream product of the spatial light modulator in the prior art is liquid crystal, but the speed is not very high, the performance such as temperature is limited, and the lithium niobate modulator is traditionally bulky and bulky. A lithium niobate metasurface spatial light modulator based on graphene electrodes

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  • Graphene electrode-based lithium niobate metasurface spatial light modulator

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Embodiment 1

[0027] refer to figure 1 , a lithium niobate metasurface spatial light modulator based on graphene electrodes, including an incident grating layer, a top electrode, a waveguide layer, a base and a bottom electrode, the incident grating layer is horizontally arranged above the top electrode, and the incident grating layer is made of organic Made of glass, the top electrode is fixedly connected to the top of the waveguide layer, the top electrode is a single layer of graphene, the waveguide layer is set on the top of the substrate, the waveguide layer is a lithium niobate film layer, the bottom electrode is fixedly connected to the bottom of the substrate, and the substrate is two Silicon oxide layer, bottom electrode is Au layer.

[0028] In the present invention, if figure 1 Shown in, P, f, h g 、h wg 、h s and h m Respectively represent grating period, duty cycle, PMMA, LN, SiO 2 and Au thickness, choose LN(n o =2.286,n e =2.203) as the waveguide layer and silicon dioxi...

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Abstract

The invention discloses a graphene electrode-based lithium niobate metasurface spatial light modulator, which comprises an incident grating layer, a top electrode, a waveguide layer, a substrate and a bottom electrode, wherein the incident grating layer is horizontally arranged above the top electrode, the top electrode is fixedly connected with the top of the waveguide layer, the waveguide layer is arranged at the top of the substrate, and the bottom electrode is fixedly connected with the bottom of the substrate. The graphene is coupled with the high-Q guided-mode resonance grating, 99.99% of absorption is achieved in the range from visible light to near infrared, in addition, the grid voltage is increased through the electro-optical effect of the LN so as to change the refractive index, and absorption of the structure can be adjusted.

Description

technical field [0001] The invention relates to the technical field of light modulators, in particular to a lithium niobate metasurface spatial light modulator based on graphene electrodes. Background technique [0002] The space laser communication system refers to an optical communication system that uses laser light waves as the carrier and the atmosphere as the transmission medium. Free space laser communication combines the advantages of optical fiber communication and microwave communication. It not only has the advantages of large communication capacity and high-speed transmission, but also does not need to lay optical fibers. progress. [0003] Lidar is a radar system that emits laser beams to detect characteristic quantities such as the position and speed of targets. Its working principle is to send a detection signal (laser beam) to the target, and then compare the received signal (target echo) reflected from the target with the transmitted signal, and after prop...

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Application Information

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IPC IPC(8): G02F1/03
CPCG02F1/0311G02F1/0316
Inventor 张检发陈星桥孟启徐威朱志宏袁晓东秦石乔
Owner NAT UNIV OF DEFENSE TECH
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