Method for designing surface plasmon polariton wave absorber

Abstract

The invention discloses a method for designing a surface plasmon polariton wave absorber, which comprises the following steps of: generating an SPP signal by adopting a Vivaldi gradually-changed slot, coupling the SPP signal to a comb-shaped intrinsic structure through a coplanar waveguide (CPW) feed structure, transmitting the SPP signal along the comb-shaped intrinsic structure, and receiving the SPP signal at a receiving end by adopting the Vivaldi gradually-changed slot. Indium tin oxide (ITO) is adopted as a basic structure of an SPP absorption unit, the wave vector of the SPP absorption unit is matched with the wave vector of an SPP signal by regulating and controlling dispersion characteristics and impedance characteristics, and the SPP absorption unit is matched with the impedance of the SPP signal; The invention is used for absorbing SPP signals in the transmission process. A broadband SPP signal is generated by adopting an SPP excitation and receiver, an SPP wave-absorbing structure is designed by adopting an indium tin oxide (ITO) structural unit, the transmission wave vector of the wave-absorbing structure is improved by adjusting the geometric dimension of ITO, so that the excited SPP signal can be stably transmitted without scattering, wave impedance matching is realized by changing the conductivity parameter of the ITO structure, and the SPP wave-absorbing structure can be applied to the field of microwave sensing. Therefore, perfect absorption of the SPP signal is realized.

Description

technical field [0001] The invention relates to the technical field of electronic information and stealth, and more specifically relates to a design method of a surface plasmon wave absorber. Background technique [0002] Surface plasmon polaritons (SPP) refer to a sub-wavelength intrinsic electromagnetic mode formed by the interference between light quanta of electromagnetic waves and free electrons in metals at the medium / metal interface. SPP has strong local field characteristics, and its electric and magnetic field amplitudes exhibit exponential decay on both sides of the interface. The unique electromagnetic properties of SPP make it have very important application value in the fields of photonics, enhanced Raman effect, optical waveguide, and plasma integrated devices. The SPP mode of the metal interface only exists in the optical frequency band, but due to the large imaginary part of the refractive index in the optical frequency band, the intrinsic SPP transmission l...

AI Technical Summary

Problems solved by technology

However, SPP signals are not always useful. Some SPP signals will destroy the radiation characteristics of antennas and the scattering characteristics of devices, especially in the stealth field. The surface excites creeping waves that propagate along the interface. This type of creeping wave reflects strongly after hitting the metal-air interface. This part of the reflection will significantly enhance the RCS of the stealth object, thereby affecting the stealth effect

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