Terahertz wave modulation method, device and device based on artificial surface plasmon
A surface plasmon and artificial surface technology, which is applied in the field of terahertz wave modulation of plasma, can solve the problems that affect the general application, the limited range of semiconductor plasma frequency change, and the limited range of surface plasmon wave modulation frequency band, etc., to reach the selection range Wide range, easy to meet working conditions, and optional modulation range
Inactive Publication Date: 2017-12-12
安徽太赫兹医疗科技有限公司
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[0004] However, the above method requires a relatively large temperature change range to achieve a relative change in the frequency of the semiconductor plasma. Due to the limited range of temperature change, the range of change in the frequency of the semiconductor plasma is also limited, so the modulation frequency range of the surface plasma wave is limited. In addition , the semiconductor used in this method needs to meet the plasma frequency at room temperature in the terahertz band, and only a few semiconductors such as indium antimonide meet this condition, which affects the general application of this technology
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[0026] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0027] The idea of the present invention is to use the characteristic that the equivalent surface plasmon frequency of the metal surface is only related to the geometric parameters of the surface structure in the artificial surface plasmon wave theory to realize the on-off modulation of the terahertz wave.
[0028] Surface plasmon polaritons (Surface Plasmon Polarition, referred to as SPPs) are a mixed excited state of electrons and photons at the interface between metal and medium, which can propagate like waves. The constraint of SPPs on the electromagnetic field can break through the diffraction limit and achieve sub-wavelength constraints, thereby achieving the purpose of designing sub-wavelength photonic functional components. However, the plasma frequency of metals is generally in the ultraviolet band, the absolute value of the dielectric coeffi...
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The invention discloses an artificial surface plasma-based terahertz wave modulation method, belonging to the technical field of electromagnetic wave modulation. The modulation method comprises the following steps that: two one-dimension metal optical gratings are constructed on a metal surface as two transmission channels of artificial surface plasma waves, the equivalent plasma frequency of one one-dimension metal optical grating is greater than the maximum frequency of to-be-modulated terahertz wave, and the equivalent plasma frequency of the other one one-dimension metal optical grating is smaller than the minimum frequency of to-be-modulated terahertz wave; the terahertz waves are respectively in on and off statuses in the two transmission channels, and the on and off modulation of the terahertz waves can be realized by switching the two transmission channels. The invention further discloses an artificial surface plasma-based terahertz wave modulation device and a modulation apparatus. The modulation on the terahertz wave can be realized at normal temperature, the modulation device is wide in tuning frequency band, the selection range of hardware materials is wide, the modulation process operation is simple and flexible, and the advantage of sub-wavelength confinement can be achieved.
Description
technical field [0001] The invention relates to an electromagnetic wave modulation technology, in particular to a terahertz wave modulation method based on artificial surface plasmons. Background technique [0002] Terahertz (THz) waves usually refer to frequencies between 0.1 and 10THz (1THz=10 12 Hz) electromagnetic wave, whose wavelength is between microwave and near-infrared, belongs to the category of far-infrared electromagnetic radiation. Terahertz wave technology has broad application prospects in astronomical remote sensing, biomedicine, public safety, and industrial nondestructive testing. In the field of communication, if the terahertz signal is used as a broadband information carrier, it can carry many more channels than microwaves. Moreover, other electromagnetic bands have been allocated to services such as broadcasting and mobile phone communications, while the terahertz band has not yet been allocated for use. If it can be used for communication, it will h...
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IPC IPC(8): G02F1/01
CPCG02B26/00G02F1/01G02F2203/13
Inventor 杨涛蒋冰李兴鳌黄维何浩培周馨慧
Owner 安徽太赫兹医疗科技有限公司