A kind of preparation method of organic whispering gallery (wgm) resonant cavity

Abstract

The invention discloses a preparation method of a Whispering Gallery (WGM) resonant cavity. The preparation method provided by the present invention is an organic microdisk structure with a smooth surface obtained by an emulsion assembly method. The organic polymer with good light transmission and good mechanical flexibility is used as the main material, and the surface is prepared by the emulsion self-assembly method. Smooth microdisk structure. A whispering gallery (WGM) resonant cavity with a low threshold was obtained by doping with suitable organic fluorescent small molecules, and the influence of the cavity structure on its optical properties was studied to realize the effective output of the whispering gallery (WGM) laser, so as to facilitate the following Integrate functions in one step. However, the currently proposed assembly method is difficult to effectively control the resulting cavity structure, which is not conducive to our adjustment of the laser mode and the radiation angle of the laser.

Description

technical field [0001] The invention relates to a preparation method of a Whispering Gallery (WGM) resonant cavity. Background technique [0002] The micro-nano resonator is a basic component in the photonics circuit. It can be used as a coherent light source on the micro-nano scale to provide the most original signal input for the photonics circuit. We know that the realization of the laser is inseparable from the pump source, the gain The three necessary conditions of the medium and the resonant cavity, among which the resonant cavity plays a decisive role in the degree of device miniaturization, how to realize a high-quality resonant cavity at the micro-nano scale is crucial to the development of nanophotonics. [0003] At present, the commonly used optical cavity is a Fabry-Perot (F-P) resonant cavity composed of two high-reflectivity mirrors placed in parallel. Photons are reflected back and forth between the two mirrors to form standing waves to achieve optical confine...

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Problems solved by technology

[0003] At present, the commonly used optical cavity is a Fabry-Perot (F-P) resonant cavity composed of two high-reflectivity mirrors placed in parallel. Photons are reflected back and forth between the two mirrors to form standing waves to achieve optical confinement and spectral modulation. When the size of the device is reduced to the micro-nano scale, the diffraction effect of light will become very obvious, causing a significant decrease in the reflectivity of the mirror, which seriously hinders the improvement of the quality of the resonant cavity; in contrast, the Whispering gallery mode (Whispering gallery mode, WGM) resonant cavity uses the way of total reflection of light at the closed and curved interface to confine photons, which effectively avoids the dissipation problem caused by low reflectivity at both ends of F-P, and can realize more High-quality (Q) optical resonators have great application prospects in the construction of micro-nano light sources. The resonance of the whispering gallery mode has been realized in micro-cavities of various shapes, including ring, disc, spherical and other structures. Moreover, related studies have proved that WGM resonators can provide sufficient optical feedback at the micro-nano scale to achieve low-threshold laser radiation.

[0004] However, at present, most of the WGM resonators are constructed of inorganic materials, which often require complex epitaxial growth technology to introduce the optical gain medium, and the epitaxial growth technology needs to meet strict lattice matching and other conditions, which has great limitations. It is very unfavorable for us to adjust and expand the laser wavelength if the selection range of gain materials is limited. However, organic materials can be effectively blended and doped to achieve optical gain and realize the coupling output of micro-disk WGM laser signals, which has great application prospects.

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