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All-optically controlled terahertz intensity modulator and terahertz intensity modulator

An intensity modulator and terahertz technology, applied in the field of terahertz spectroscopy, can solve the problems of low modulation speed and narrow spectral range

Inactive Publication Date: 2014-01-01
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the problems of low modulation speed and narrow spectral range of existing terahertz intensity modulators and improving the application range of the system, the present invention proposes an all-optical control terahertz intensity modulator and The terahertz intensity modulator enhances the photon absorption efficiency of the graphene layer through the nano-gold particle layer, increases the density of photogenerated carriers, and then strengthens the absorption of terahertz waves and enhances the modulation effect of the modulator

Method used

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Embodiment 1

[0090] Embodiment 1: An all-optical control terahertz intensity modulator includes:

[0091] A terahertz wave generating device, used for generating a terahertz wave;

[0092] A pumping light wave generating device, used to generate pumping light waves;

[0093] The terahertz intensity modulator is used to absorb the photons of the pump light wave, generate photo-generated carriers, and then absorb the terahertz waves used to drive the motion of the photo-generated carriers. The photo-generated carriers are driven by the terahertz wave electric field, and other Particle interaction consumes and disperses the energy of the terahertz wave electric field to other particles, thereby modulating the intensity of the terahertz wave; by adjusting the intensity of the pump light wave, the concentration of photogenerated carriers in the graphene layer is adjusted, and finally the terahertz wave is modulated The output intensity of wherein the terahertz intensity modulator c...

Embodiment 2

[0097] Embodiment 2: On the basis of Embodiment 1, the terahertz wave generator includes a terahertz generator for generating a terahertz wave signal, and a terahertz wave input for focusing the terahertz generator to output terahertz wave energy The adjuster, after the terahertz wave input adjuster focuses the energy of the terahertz wave signal, the focus of the terahertz wave is located on the upper surface of the graphene layer, and the quartz substrate is located on the lower surface of the graphene layer.

Embodiment 3

[0098] Embodiment 3: On the basis of Embodiment 2, the terahertz wave input angle regulator is a terahertz lens or a parabolic mirror.

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Abstract

The invention relates to the technical field of terahertz spectrums, in particular to a graphene-based all-optically controlled ultra-high speed terahertz intensity modulator. The technical problems of low modulation speed and narrow spectrum range of the conventional terahertz intensity modulator are solved, and the application range of a system is widened. According to the graphene-based all-optically controlled ultra-high speed terahertz intensity modulator, gold nanoparticles are adopted, so that the photon absorption efficiency of graphene is enhanced, the concentration of photon-generated carriers is improved, the absorption of terahertz waves is further enhanced, and the modulation effect of the modulator is enhanced. The graphene-based all-optically controlled ultra-high speed terahertz intensity modulator comprises a terahertz wave generation device, a pumping light wave generation device, a terahertz intensity modulator and a terahertz wave detection device, which are connected to finish the design of the graphene-based all-optically controlled ultra-high speed terahertz intensity modulator. The graphene-based all-optically controlled ultra-high speed terahertz intensity modulator is mainly applied to the fields of terahertz communication systems and terahertz researches.

Description

technical field [0001] The invention relates to the technical field of terahertz spectroscopy, in particular to an all-optical control terahertz intensity modulator and a terahertz intensity modulator. Background technique [0002] Terahertz waves have broad application prospects in biomedical diagnosis, airport security imaging, military detection, atmospheric research, high-speed communication, quality control of packaging products, and agricultural humidity analysis. Driven by application requirements, terahertz science and technology have made great progress. In the past two decades, the development of terahertz time-domain spectroscopy and quantum cascade lasers has provided suitable light sources and detection methods for the research of terahertz waves, which has made great progress in terahertz emission and detection technologies. Terahertz intensity modulator is a key component of manipulating terahertz signal transmission system, and its related research is of gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G02F1/11
Inventor 彭龙瑶朱礼国钟森城孟坤刘乔李泽仁
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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