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Terahertz modulator in graphene and optical grating composite structure

A composite structure, terahertz technology, applied in the direction of instrumentation, optics, nonlinear optics, etc., can solve the problems of large modulation depth and modulation speed limited by diode modulation speed, achieve large modulation depth, change absorption intensity, and realize electronic control modulation effect

Inactive Publication Date: 2018-04-06
UNIV OF SHANGHAI FOR SCI & TECH
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  • Description
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  • Application Information

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Problems solved by technology

The modulation depth of this type of modulator is large and the effect is remarkable, but the modulation speed is limited by the modulation speed of the diode itself

Method used

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  • Terahertz modulator in graphene and optical grating composite structure
  • Terahertz modulator in graphene and optical grating composite structure
  • Terahertz modulator in graphene and optical grating composite structure

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Embodiment Construction

[0024] The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

[0025] figure 1 It is a structural schematic diagram of a terahertz modulator based on a composite structure of graphene and a grating in an embodiment of the present invention.

[0026] Such as figure 1 As shown, the terahertz modulator 100 based on graphene and grating composite structure in this embodiment is connected to a power supply for modulating terahertz waves. The terahertz modulator 100 includes a substrate layer 10, a reflective layer 20, a lower insulating dielectric layer 30, a graphene thin film layer 40, an upper insulating dielectric layer 50 and a grating layer 60 arranged in sequence from bottom to top, and the graphene thin film layer 40 The electrode 70.

[0027] Such as figure 1 As shown, the substrate la...

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Abstract

The invention provides a terahertz modulator in a graphene and optical grating composite structure. The terahertz modulator is connected with a power supply to modulate a terahertz wave. The terahertzmodulator comprises a lower insulated medium layer, a graphene thin film layer, an upper insulated medium layer and an optical grating layer orderly arranged from bottom to top, wherein the optical grating layer is has a sub-wavelength period; the graphene thin film layer is single-layered; at least one electrode is arranged on the graphene thin film layer; the electrode and the sub-wavelength grating are electrically connected with the power supply; further the terahertz modulator has a reflection layer and a lining layer; and the reflection layer and the lining layer are orderly arranged onthe bottom of the lower insulated medium layer from top to bottom. An F-P resonant cavity is formed by the lower insulated medium layer and the upper insulated medium layer; the F-P effect reinforcesinteraction between a photo mode local electric field and graphene on the resonant frequency point; quick modulation and great modulation depth can be achieved; reflection rate of the reflection layer can be enhanced; and great modulation effect can be provided.

Description

technical field [0001] The invention relates to the field of terahertz functional devices, in particular to a terahertz modulator based on a graphene and grating composite structure. Background technique [0002] Terahertz (THz) waves are electromagnetic waves between microwaves and far infrared, corresponding to a wavelength range of 30-3000 μm. In recent years, with the rapid development of ultrafast laser technology, the generation of terahertz pulses has a stable and reliable excitation source, making terahertz technology widely used in information science, biomedicine, physics, chemistry, astronomy, spectroscopy and imaging technology. It has been widely used in many fields, and has become one of the important directions of future science and technology development, which is of great significance to the national economy and national defense construction. [0003] The terahertz modulator is an important terahertz functional device, and its application fields include ter...

Claims

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Application Information

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IPC IPC(8): G02F1/17
CPCG02F1/17
Inventor 杨振兴郭旭光朱亦鸣
Owner UNIV OF SHANGHAI FOR SCI & TECH
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