A broadband metamaterial terahertz microwave absorber based on optically controlled switch

Abstract

The invention provides a broadband metamaterial terahertz microwave absorber based on an optical control switch, comprising an underlayer metal reflective plate and a dielectric substrate above the underlayer metal reflective plate, wherein the dielectric substrate is covered with periodic structural units, the periodic structural units are composed of a light-controlled semiconductor silicon patch and a metal patch, and comprise a double-arm spiral structure located in the center of the dielectric substrate and a double-Y-shaped strip structure uniformly and symmetrically distributed along the periphery of the dielectric substrate. The absorber has good absorbing effect under TE wave and TM wave. Different conductivity represents different level of light excitation, so the absorbing effect can be adjusted effectively by adjusting the conductivity of surface photo-controlled semiconductor silicon, so that the absorbing frequency domain with the absorbing rate above 90% can cover almostthe whole THz band. The invention also has the characteristics of simple structure, strong functionality, extremely wide absorption bandwidth and the like.

Description

technical field [0001] The invention relates to an ultra-broadband terahertz wave absorber, in particular to a light-controlled switch-based broadband metamaterial terahertz wave absorber, which belongs to the field of radio communication and terahertz devices. Background technique [0002] Terahertz generally refers to electromagnetic waves with a frequency in the range of 0.1 to 100 terahertz. With the development of terahertz technology, the functions of some microwave devices have been updated to a certain extent. Ordinary microwave radars are often ineffective in detecting stealth weapons with a small radar cross-section. Therefore, for a long time, people have not made any progress in the research of radar stealth technology. However, terahertz, which is in the transition region of the electromagnetic spectrum, has a very short wavelength, contains abundant frequencies, and has a wide bandwidth, which can be used to detect smaller targets and more precisely locate, and...

AI Technical Summary

Problems solved by technology

Ordinary microwave radars are often ineffective in detecting stealth weapons with a small radar cross-section. Therefore, for a long time, people have not made any progress in the research of radar stealth technology.

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