Surface plasmon waveguide tunable optical filter

Abstract

The invention discloses a surface plasmon waveguide tunable optical filter. The surface plasmon waveguide tunable optical filter mainly comprises a metal film and a plurality of slit structure units formed in the metal film; the horizontal rectangular slit in the plurality of slit structure units is formed at the one third of the lower end of the metal film; the longitudinal rectangular slit in the plurality of slit structure units is formed at the upper end of the middle of the horizontal rectangular slit and is perpendicular to the horizontal rectangular slit; the disk slit in the pluralityof slit structure units is formed at the upper end of the longitudinal rectangular slit, and the center point of the disk slit and the center point of the longitudinal rectangular slit are on the samevertical axis; two identical isosceles triangles are embedded in the disk slit; the vertical angles of the isosceles triangles are connected with each other, and the bottom edges of the isosceles triangles are parallel to each other, so that a bowknot-shaped metal rod can be formed; the joint of the vertical angles of the isosceles triangles is the center of the disk slit; and all the slit structure units penetrate the upper surface and lower surface of the metal film and form an integrated slit structure. The structure of the filter of the invention has a tunable property and high transmittance in a near-infrared band; the full width at half maximum of the transmission spectrum and frequency-selection position of the filter can be achieved by changing the relevant parameters of the structure; and therefore, the surface plasmon waveguide tunable optical filter has the advantages of wide application range, high utilization and easiness in integration.

Description

(1) Technical field [0001] The invention belongs to the technical field of micro-nano optoelectronics, and specifically relates to a surface plasmon waveguide tunable optical filter. (2) Background technology [0002] Surface Plasmon Polartions (SPPs) are the co-resonance of free electrons in metal nanostructures with a series of novel optical properties. The surface plasmon is a special surface electromagnetic evanescent wave that propagates along the metal-medium surface and attenuates exponentially in the direction perpendicular to the metal surface. It can break through the traditional optical diffraction limit. The most attractive feature is that it helps to break through the constraints of the sub-wavelength structure to guide light propagation, which will help realize the miniaturization of the size of the photonic device. [0003] With the gradual maturity of nanotechnology and the gradual improvement of the theory of surface plasmons, surface plasmon photonics has become ...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at the traditional filter and the filter problem that the transmission spectrum is difficult to tune

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