Eccentric hole microstructure optical fiber light-operated tunable Fano resonance filter integrated with azobenzene material

Abstract

The invention discloses an eccentric hole microstructure optical fiber light-operated tunable Fano resonance filter integrated with an azobenzene material. The inner wall of the eccentric hole of theeccentric hole microstructure optical fiber is formed by a germanium-doped high-refractive-index ring, a layer of azobenzene film is integrated on the outer surface of the eccentric hole optical fiber, and echo wall modes can be obtained in the azobenzene film and the germanium-doped high-refractive-index ring of the eccentric hole optical fiber at the same time. When the quality factor of the echo wall mode in the azobenzene film is lower than the quality factor of the echo wall mode in the eccentric hole optical fiber germanium-doped high refractive index ring by more than one order of magnitude and a phase matching condition is met, a Fano resonance phenomenon occurs, and a Fano resonance spectrum is obtained. The filter can be applied to the fields of tunable optical filtering, tunablerefractive index sensing, light intensity detection and the like. The filter has the advantages of high sensing sensitivity, wide wavelength tuning range, large refractive index sensing range, simpleand feasible tuning means, high tuning linearity and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing. A light-controllable tunable Fano resonance filter is formed by doping germanium on the inner wall of a partial hole filled with a liquid material to form a high refractive index ring and integrating an azobenzene material film on the outer surface of the partial hole optical fiber. . Background technique [0002] Fano resonance is a resonant scattering phenomenon with asymmetric spectral line shape produced by interference effect. In the field of classical optics, the asymmetric lines of the Fano resonance originate from the interference between two scattering amplitudes, which are respectively derived from the scattering of the continuous state (background scattering) and the excitation of the discrete state (resonance process). The Fano resonance phenomenon occurs when the resonant state energy is within the continuum energy range. The background scattering energy usually chang...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of difficult processing, high production cost, low degree of integration, complex resonance wavelength tuning means, and limited sensing range commonly found in Fano resonant filters, and to provide an integrated azobenzene material. Optically Controlled Tunable Fano Resonance Filters with Partial Hole Microstructure Fiber

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