Liquid drop microcavity with high Q value based on columnar waveguide surface formation

Abstract

The invention discloses a liquid drop microcavity with high Q value based on columnar waveguide surface formation. The liquid drop microcavity comprises a columnar waveguide, a surface liquid drop, anisolating device and a conical fiber. A smooth spherical microcavity is formed on the surface of the columnar waveguide through surface tension, and the size of the liquid drop microcavity is determined by the size of the columnar waveguide. The dismountable isolating device is mounted around the columnar waveguide. Evanescent field coupling is carried out on the liquid drop microcavity and the conical fiber on the surface of the columnar waveguide, and resonance of an echo wall mode inside the liquid drop microcavity is simulated through a total reflection mechanism, so that an echo wall mode resonance spectrum with high quality factor, narrow bandwidth and periodic oscillation is obtained. The liquid drop microcavity disclosed by the invention is prepared in room temperature, and has the characteristics of simple technology, high forming efficiency, high quality factor, high intracavity narrow-band echo wall mode resonance and the like. The liquid drop microcavity has wide application potential in the fields of optical fiber sensing and optical fiber communication.

Description

technical field [0001] The invention belongs to the technical field of optical microcavities, in particular to a whispering gallery mode droplet microcavity, in particular to a high-Q droplet microcavity based on cylindrical waveguide surface shaping. Background technique [0002] Whispering gallery mode optical microcavity has extremely high quality factor, extremely small mode volume, extremely narrow spectral line width and ultra-high energy density. Compared with Fabry-Perot cavity, it also has small size, easy integration and low cost. low merit. Because of the many advantages of optical microcavities, how to conveniently manufacture high-quality optical microcavities has become one of the key contents of people's research. [0003] The high Q value and integratable characteristics of the whispering gallery mode microcavity make it have great application potential in the field of optical fiber communication and optical sensing, such as high-efficiency filters, high-sen...

AI Technical Summary

Problems solved by technology

The surface of the microcavity directly prepared by the etching process is rough, and the quality factor of the cavity is greatly limited; in the process of melting method, due to the effect of surface tension, it will naturally form a smooth shape, thus obtaining a high quality factor. The asymmetry of the microcavity makes the generated whispering gallery mode resonance spectrum side mode suppression relatively low; polymer materials have good plasticity and can be repeatedly processed, but their quality factors still need to be improved

Although a single high-quality microcavity or an array of mutually coupled microcavities can be prepared by these methods, these preparation methods have high requirements for experimental equipment and have great limitations, which cannot be realized in general laboratories.

[0005] The traditional droplet microcavity has no special carrier and is formed directly by liquid. Although the preparation is simple and suitable for most laboratory conditions, the common problem is that the quality factor is not high, the resonance of the narrow-band whispering gallery mode in the cavity is not strong enough, and the size of the droplet microcavity uncontrollable

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