Multidirectional surface wave separator with fully-isolated bandwidth

Abstract

The invention discloses a multidirectional surface wave separator with a fully-isolated bandwidth. The multidirectional surface wave separator is formed by constructing multiple waveguides in different directions on a surface wave photonic crystal that is constructed by metal column array structures periodically arranged on the metal surface through a defect introducing mode, the distances between metal posts of the surface wave photonic crystal and the column are equal, and the distance is less than 1/2 of the working wavelength of surface waves; the waveguides are formed by reducing the height of the metal posts on the surface wave photonic crystal in the defect introducing mode, and the resonant frequency at the defect is within a forbidden band of the surrounding surface wave photonic crystals; and one end of each waveguide is connected with an excitation source. According to the multidirectional surface wave separator disclosed by the invention, the wave separation is based on a coupled resonant cavity optical waveguide that adopts a tight-binding approximation principle, rather than a dispersion relation of a traditional surface plasma waveguide, and thus the complete separation of the surface waves in different frequency ranges can be achieved; and the operating frequency range of the multidirectional surface wave separator can be randomly changed by adjusting geometrical parameters of the metal structure.

Description

technical field [0001] The invention belongs to the field of surface wave multi-directional wave splitters, in particular to a multi-directional surface wave splitter with completely isolated bandwidth. Background technique [0002] Artificial surface plasmon is a surface electromagnetic wave that exists on uneven metal surfaces in the low frequency band (microwave, terahertz or far infrared). Since the surface electromagnetic wave is limited in the sub-wavelength range and not limited by the diffraction limit, it is in There are important applications in the miniaturization of integrated circuit devices and data storage. How to effectively control the transmission of surface waves is crucial to realize these important applications. [0003] The existing surface wave multidirectional wave splitter is mainly based on the traditional artificial surface plasmon waveguide, and the wave splitting of the surface wave is realized by constructing waveguide structures with different...

AI Technical Summary

Problems solved by technology

However, the traditional surface plasmon dispersion relationship starts from light, so although the surface wave splitter based on the traditional surface plasmon dispersion relationship can be isolated in the high-frequency band, the dispersion relationship in the low-frequency band still overlaps and cannot be completely separated. Complete separation of surface waves of different frequencies

This results in the failure of the low-frequency band splitting function.

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