Mixed Plasmon waveguide Bragg grating with double-forbidden band

Abstract

The invention discloses a mixed Plasmon waveguide Bragg grating with double-forbidden band; the mixed Plasmon waveguide Bragg grating comprises two mixed Plasmon waveguide Bragg grating sets with different period structures and coupled with admittance coupling waveguides on an incident terminal and emission terminal; the first set of mixed Plasmon waveguide Bragg grating is formed by alternativelyarranging two waveguides; the second set of mixed Plasmon waveguide Bragg grating is formed by alternatively arranging two waveguides; the two mixed Plasmon waveguide Bragg grating sets are respectively formed by periodically and alternatively filling two low refractive index materials A and B between a metal Ag bar and a high refractive index material Si. The mixed Plasmon waveguide Bragg grating is simple in structure, and can stop a TM mode on two assigned broadband positions; the waveguide length and grating period in a coupling zone can be changed so as to dynamically select transmissionbands in an assigned wave band, thus adjusting and optimizing the passband and forbidden band positions and performances.

Description

technical field [0001] The invention relates to a hybrid plasmonic waveguide Bragg grating with double forbidden bands, which can be used in technical fields such as optical communication and integrated optics. Background technique [0002] In the development of the modern communication field, the improvement of device integration has always been an important pursuit in the research of photonics. Various nano-optical waveguide structures represented by photonic crystal waveguides and surface plasmon waveguides have been proposed and accepted. develop. Among them, the surface plasmon waveguide breaks through the constraints of the diffraction limit in traditional optical research, but due to the existence of ohmic losses, the waveguide cannot be used for long-distance transmission. In order to achieve a compromise between loss and confinement, a hybrid surface plasmon waveguide is proposed. By introducing a low-refractive-index gap between the metal and the high-refractive i...

AI Technical Summary

Problems solved by technology

Among them, the surface plasmon waveguide breaks through the constraints of the diffraction limit in traditional optical research, but due to the existence of ohmic losses, the waveguide cannot be used for long-distance transmission

Images