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Terahertz surface plasma wave optical modulator and modulation method thereof

A surface plasmon and plasma technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of inability to realize zero-return modulation, narrow modulation frequency bandwidth, and low modulation speed, so as to eliminate the possibility of scattering effective signal energy performance, fast modulation, and improved signal-to-noise ratio

Inactive Publication Date: 2012-11-28
NANJING FANGYUAN GLOBAL DISPLAY TECH
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Problems solved by technology

[0012] Technical problem: The purpose of the present invention is to provide a terahertz surface plasmon wave optical modulator and its modulation method to solve the problems of high production cost, large energy loss, narrow modulation frequency bandwidth, and low modulation speed in the background technology. Unable to achieve technical problems such as zero-return modulation

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  • Terahertz surface plasma wave optical modulator and modulation method thereof
  • Terahertz surface plasma wave optical modulator and modulation method thereof
  • Terahertz surface plasma wave optical modulator and modulation method thereof

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Embodiment Construction

[0037] The structure of the terahertz surface plasmon wave optical modulator of the present invention includes an intrinsic semiconductor wafer whose plasma frequency is in the terahertz band when the plasma frequency is close to normal temperature, two blades placed in parallel, a continuous wave laser, a laser modulator and a temperature control device. The two blades are perpendicular to the intrinsic semiconductor wafer, with the cutting edges facing down and keeping a certain distance from the semiconductor surface. The distance between the two blades is smaller than the propagation distance of the maximum frequency terahertz surface plasmon wave on the semiconductor surface under laser irradiation. The thickness of the intrinsic semiconductor wafer is greater than the attenuation distance of the minimum frequency terahertz surface plasmon wave in the semiconductor. The temperature controller is closely attached to the lower surface of the intrinsic semiconductor wafer, ...

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Abstract

The invention discloses a terahertz surface plasma wave optical modulator and a modulation method thereof, wherein the modulator comprises an intrinsic semiconductor chip, two blades or gratings which are arranged in parallel, a continuous wave laser, a modulation and alignment system and a temperature control device. The method comprises the steps of: irradiating the intrinsic semiconductor chipwith the laser modulation signals which are emitted by the continuous wave laser and the modulation and alignment system to change the quantity of photo-generated carriers throughout the surface of the intrinsic semiconductor chip; modulating the plasma wave on the terahertz surface, which is transmitted by the surface of the intrinsic semiconductor chip, by changing the light intensity of the laser modulation signals; and coupling the terahertz wave to terahertz surface plasma wave and coupling the terahertz surface plasma wave modulated to the terahertz wave by using the two blades or the gratings which are arranged in parallel. The terahertz surface plasma wave optical modulator and the modulation method thereof provided by the invention have the advantages that the manufacturing cost is low, the energy consumption is low, the modulation frequency range is wide, the purpose of zero modulation can be realized, and the purpose of fast modulation can be realized.

Description

technical field [0001] The invention relates to a terahertz surface plasma wave optical modulation device and a method for modulating the terahertz surface plasma wave by using the characteristic that the intrinsic semiconductor plasma frequency varies with the number of photogenerated carriers. Background technique [0002] Terahertz (Terahertz, THz for short) waves generally refer to frequencies in the range of 0.1-10THz 12 Hz) range of electromagnetic waves. Its wave band is between microwave and near-infrared, and belongs to the category of far-infrared and submillimeter waves. Terahertz electromagnetic radiation has the following unique characteristics compared with electromagnetic waves in other bands: (1) Terahertz waves have strong penetrating power for many non-polar molecular substances, such as ceramics, plastics, paper, clothing and other packaging materials, Can be used for non-destructive and non-contact detection and safety inspection. Most polar molecules ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/355H04B10/155H04B10/516
Inventor 杨涛何浩培黄维李兴鳌仪明东
Owner NANJING FANGYUAN GLOBAL DISPLAY TECH
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