Electromagnetic wave modulation method based on surface plasma wave transmission distance

Abstract

The present invention discloses an electromagnetic wave modulation method based on a surface plasma wave transmission distance. According to the method, two parallel metal blades are arranged above the surface of a semiconductor plate, wherein the two parallel metal blades are a first blade and a second blade; cutting edges of the two metal blades are perpendicularly pointing to the surface of the semiconductor plate, and distances between the two cutting edges of the two metal blades and the surface of the semiconductor plate are equal; electromagnetic wave with the frequency less than the semiconductor plasma frequency is emitted to the gap between the cutting edge of the first blade and the semiconductor plate from the outer side of the first blade, and surface plasma waves on the surface of the semiconductor plate are excited, and the surface plasma waves are transmitted from the position below the cutting edge of the first blade to the position below the cutting edge of the second blade along the surface of the semiconductor plate; and at a constant temperature, the distance between the two metal blades is adjusted, and strength of the electromagnetic waves coupled on the cutting edge of the second blade is changed. With the present invention, the method has characteristics of low energy consumption, wide tuning frequency band, low hardware cost, simple operation and flexibility, and functions of zeroing modulation and non-zeroing modulation can be achieved.

Description

technical field [0001] The invention relates to an electromagnetic wave modulation method, in particular to an electromagnetic wave modulation method based on the surface plasma wave transmission distance. Background technique [0002] Surface plasmon waves are collective oscillations of metal or semiconductor surface charges induced by external electromagnetic waves, and have the propagation properties of surface electromagnetic fields. Since its energy is confined to the interface of two materials, surface plasmon waves have potential applications in many directions such as display, storage, sensing, and detection. In previous studies, most of the studies focused on the behavior of surface plasmon waves on the metal surface, and less research was done on its transmission behavior on the semiconductor surface. One of the outstanding advantages of selecting semiconductor materials is that their free carriers can be changed by doping or temperature adjustment, thereby changi...

AI Technical Summary

Problems solved by technology

Although the modulation frequency band is relatively wide compared with the technique of J. Gómez Rivas, this method requires a large temperature change range to realize the relative change of the semiconductor plasma frequency and the electromagnetic wave frequency

Due to the limited range of temperature changes and the limited range of semiconductor plasma frequency changes, the modulation frequency range of surface plasmon waves is limited, which affects the general application of this technology.

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