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Dynamic Q-switching device and method based on photonic crystal microcavity

A technology of photonic crystal microcavity and photonic crystal, which is applied in the direction of lasers, phonon exciters, laser components, etc., can solve the problems of harsh experimental conditions, application limitations, technical complexity, etc., and achieve easy implementation and integration, strong Manipulability, good applicability effect

Active Publication Date: 2018-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These dynamic Q-switching methods, whether based on the interference effect of phase modulation or the electromagnetic induction-like transparency effect based on multi-microcavity resonance frequency modulation, involve very complicated technologies and require very strict experimental conditions, so their application limited

Method used

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  • Dynamic Q-switching device and method based on photonic crystal microcavity
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  • Dynamic Q-switching device and method based on photonic crystal microcavity

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Embodiment 1

[0040] Such as figure 1 As shown, the dynamic Q-switching device based on photonic crystal microcavity in this embodiment includes a wavelength tunable pulse laser (Pulse LD) 1, a variable optical attenuator (VOA) 2, a polarization controller 3, a lens fiber 4, a photon Crystal microcavity-waveguide structure 5, p-i-n junction electro-optic modulator (VF) 6, lens fiber 7, optical spectrum analyzer (OSA) 8.

[0041] The working wavelength of the wavelength tunable pulsed laser 1 is continuously adjustable from 1500nm to 1600nm, the tuning precision is 1MHz, the pulse width is 50ps, and the repetition frequency is 350MHz.

[0042] Such as figure 2 As shown, the photonic crystal microcavity-waveguide structure 5 of this embodiment consists of 32×17 circular air holes forming a triangular lattice in a silicon material plate, arranged along the xy plane. The air hole diameter d=0.4a, where a=420nm is the lattice constant of the photonic crystal. The refractive index of the sili...

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Abstract

The invention discloses a dynamic Q-switching device based on a photonic crystal microcavity. The device comprises a pulsed laser with a tunable wave length, a p-i-n junction electrooptical modulatorand a photonic crystal microcavity-waveguide structure; the photonic crystal microcavity-waveguide structure is composed of a front side photonic crystal waveguide, a multimode photonic crystal microcavity and a back side photonic crystal waveguide; the front side photonic crystal waveguide is located at the left side of the multimode photonic crystal microcavity, and the back side photonic crystal waveguide is located at the right side of the multimode photonic crystal microcavity. The invention further discloses a dynamic Q-switching method based on the photonic crystal microcavity. The device is simple in structure, is easily achieved and integrated, and can freely control resonant frequencies and Q values of low and super high Q value cavity membranes by elaborately designing forms, structures and sizes of the multimode photonic crystal microcavity, so that the multimode photonic crystal microcavity is provided with a larger dynamic Q-switching range and a wider work tape width.

Description

technical field [0001] The invention relates to a photonic crystal microcavity, in particular to a dynamic Q switching device and method based on the photonic crystal microcavity. Background technique [0002] Because the high-Q microcavity can localize light in a small space of sub-wavelength level for a long time, the interaction between light and matter in the cavity is greatly enhanced, so it is widely used in the fields of all-optical switches, photodiodes, and all-optical wavelength conversion. It has broad application prospects. In recent years, with the rapid development of micro-nano photonic technology, the quality factor exceeds 10 5 Ultrahigh-Q microcavities have been realized. However, high-Q microcavities face a basic difficulty: on the one hand, the higher the Q-value of the microcavity, the longer the photon storage lifetime in the microcavity; but on the other hand, due to the corresponding The line width of the cavity mode is very narrow, so the bandwidt...

Claims

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Application Information

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IPC IPC(8): H01S3/115
CPCH01S3/115Y02D30/70
Inventor 吴俊芳李潮王博
Owner SOUTH CHINA UNIV OF TECH