A Multimode Guided Mode Resonant Optical Filter with Bandwidth and Angle Switching

Abstract

The invention belongs to the technical field of guided wave optics and specifically relates to a multimode guided mode resonance optical filter with wide angle switching. The multimode guided mode resonance optical filter with wide angle switching comprises a compound transparent body of a circular cylinder or square cylinder and a planar optical waveguide; the circular cylinder or square cylinder is cut along the longitudinal axis at a certain angle; the planar optical waveguide is prepared on a cut surface according to a homology center wavelength; the planar optical waveguide is composed of different layers of films in different thicknesses; the planar optical waveguide has a plurality of guided modes; the two cut bodies are glued, fixed and sealed to form a compound along the cut surface; the two end faces of the compound are processed into corresponding parallel plane pairs and serve as corresponding optical transmission channels according to different incidence angles of different orders of guided modes for the planar optical waveguide; corresponding wideband antireflection films are prepared on the parallel plane pairs; the filtering effect in different bandwidths can be realized by rotating the compound through different optical transmission channels; each passband central wavelength transmissivity can reach 100%; the bandwidth can be switched between nm and pm; the bandwidth variable reaches above one order of magnitude. The filter provided by the invention has important application in the aspects of optical communication and spectrum technology.

Description

technical field [0001] The invention belongs to the technical field of guided wave optics, and in particular relates to a multi-mode guided mode resonant optical filter whose bandwidth can be switched by angle. Background technique [0002] Narrowband optical filters are indispensable optical devices in optical communication and spectral technology. There are many technologies that can produce narrow-band optical filtering, such as optical thin films, interference filters, and guided-mode resonant filters based on grating structures. However, most of these devices have complex structures and complex fabrication processes. Moreover, various filters generally only have a fixed filtering bandwidth. If you want to change, you can only change to a different filter. [0003] The present invention proposes a multi-mode guided-mode resonant optical filter whose bandwidth can be switched at an angle. Containing a grating, the complex process of preparing a sub-wavelength grating ...

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