On-chip broadband coupling optical microcavity system and coupling method thereof

Abstract

The present invention discloses an on-chip broadband coupling optical microcavity system and a coupling method thereof. In the invention, a non-circular optical microcavity and an optical waveguide prepared on a chip are adopted, and the slight deformation of the non-circular optical microcavity causes the eigenstate echo wall mode originally distributed only in the edge of the circular optical microcavity to extend into the non-circular optical microcavity, forming a "tail"; laser and the "tail" of the non-circular optical microcavity are in phase matching, so as to stimulate the excited state echo wall mode of the non-circular optical microcavity; the echo wall mode of the non-circular optical microcavity can be refracted into the optical waveguide through its "tail"; the optical waveguide enables effective broadband excitation and collection of the echo wall mode in the non-circular optical microcavity, i.e., the completion of the effective broadband coupling of the optical waveguide and the non-circular optical microcavity; and the deformation of the non-circular optical microcavity is so little that the non-circular optical microcavity can maintain high intrinsic quality factors (> 10<4>) without introducing large radiation losses.

Description

technical field [0001] The invention relates to micro-nano optics, in particular to an on-chip integrated broadband coupling optical microcavity system and a coupling method thereof. Background technique [0002] Optical microcavities can store optical energy for a long time in a small volume, greatly enhancing the interaction between light and matter. The total internal reflection of the surface of the medium occurs when the light from the high refractive index (n 1 ) materials towards low refractive index (n 0 ) when the material is incident, and the incident angle satisfies θ≥arcsin(n 0 / n 1 ). Considering that a beam of light propagates in a disk cavity through continuous reflection at the boundary, the rotational symmetry of the circle will ensure that the incident angle of the light remains constant, and the total reflection condition will always be satisfied. The phase delay of the light moving along the boundary for one week must be equal to 2πm (m=1,2,3...), so...

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Problems solved by technology

[0004] However, for different operating bands, the wave vector changes of the waveguide mode and the whispering gallery mode are not the same

Therefore, the waveguide mode in a single waveguide cannot be phase-matched with the whispering gallery mode in the microcavity in different optical bands, and the broadband coupling between the optical waveguide and the circular optical microcavity cannot be realized.

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