A kind of spherical colloidal crystal microcavity and preparation method thereof

Abstract

The invention discloses a spherical colloidal crystal microcavity and a preparation method thereof. The preparation method of the spherical colloidal crystal microcavity comprises the following steps: first processing one end of an optical fiber into a spherical shape, and then using the spherical part of the optical fiber as a base to self-assemble Methods Colloidal crystals were prepared in spherical parts, and finally the whole optical fiber was chemically etched to obtain spherical colloidal crystal microcavities. The invention uses the spherical part of the optical fiber as a base, adopts a self-assembly method to prepare colloidal crystals on the spherical part, and uses chemical corrosion to completely remove the optical fiber, thereby obtaining a spherical colloidal crystal microcavity. After the light wave is incident into the interior of the spherical colloidal crystal microcavity, it is reflected multiple times by the colloidal crystal structure. At the same time, the photonic bandgap of the colloidal crystal can effectively restrict the light wave in the characteristic band from overflowing the cavity. Therefore, in the photonic bandgap band of the colloidal crystal The light wave can form a whispering gallery mode in the spherical cavity, thereby forming a very high number of oscillations and achieving a very high quality factor.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a spherical colloidal crystal microcavity and a preparation method thereof. Background technique [0002] An optical microcavity is an optical resonant cavity that can confine the light field in the micron-scale region. It uses the reflection, scattering or diffraction at the material interface with discontinuous dielectric constant to confine the light energy to oscillate back and forth in a small area, thereby increasing the photon lifetime and reducing the number of light field modes. Optical microcavity is the most important way of optical resonance and one of the main ways to realize the functionalization of photonic devices. [0003] The optical resonant cavity can locally act on light waves in time or space, and at the same time has a frequency selection. In space, the local effect is characterized by the mode volume, and in time, its local effect is measured by t...

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Problems solved by technology

However, the results achieved by the current self-assembly methods are mostly planar or stacked structures, and the use of colloidal crystals to prepare optical microcavity structures is rare.

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