High-quality-factor lithium niobate photonic crystal microcavity based on two-color quasi-periodic potential field
A photonic crystal microcavity, high quality factor technology, applied in the field of optical information processing, can solve the problems of increasing volume and unfavorable component integration, and achieve the effect of simple design
Pending Publication Date: 2022-08-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
This design can improve the quality factor of the microcavity by naturally forming a Gaussian envelope field distribution. This method is simple in design and can also obtain a very high quality factor, but further increasing the quality factor often requires increasing the volume of the entire structure. This is not good for the integration of components
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Embodiment 1
[0035] like figure 1As shown, the present invention provides a high-quality lithium niobate photonic crystal microcavity based on a two-color quasi-periodic potential field, which consists of a plurality of A-type microcavity units 1 and a plurality of B-type microcavity units 2. The line defect 3 is formed, and the whole is arranged in a two-dimensional rectangular array, and the two-dimensional rectangular array has 40 columns and 30 rows. Among them, a plurality of B-type microcavity units 2 constitute a defect area, the defect area is located in the 5th to 35th columns of the 11th, 15th, and 19th rows, and the waveguide channel area 3 is located in the entire row area of the 5th and 25th rows. The defect region length is 29 lattice constants. The distance between the centers of adjacent A-type microcavity units 1 is 1 lattice constant. The distance between the centers of adjacent B-type microcavity units 2 is 0.966 lattice constant. like figure 2 As shown, the A-typ...
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Abstract
The invention discloses a high-quality-factor lithium niobate photonic crystal microcavity based on a two-color quasi-periodic potential field, and relates to the technical field of optical information processing. The bicolor quasi-periodic potential field photonic crystal microcavity is formed by densely paving a plurality of A-type microcavity units, a plurality of B-type microcavity units and two line defects, and each microcavity unit is formed by etching a circular truncated cone air hole through a lithium niobate film. The quality factor of the microcavity is mainly determined by the side inclination angle of the air hole cone, the thickness of the working substance, the lattice constant of the photonic crystal and other parameters. The photonic crystal microcavity provided by the invention can work in a communication wave band; the device is small in size, has a high quality factor, is simple in design, and can be applied to the processes of higher harmonic generation, electro-optical modulation, optical oscillation and the like.
Description
technical field [0001] The invention relates to the technical field of optical information processing, in particular to a high quality factor lithium niobate photonic crystal microcavity based on a two-color quasi-periodic potential field. Background technique [0002] Photonic crystal microcavities are defect regions formed by removing or adding specific scatterers in photonic crystals, which can localize light waves on subwavelength scales, compared to microring or microdisk resonators. Improving the quality factor of photonic crystal cavities has always been one of the goals of researchers. High-quality photonic crystal resonators have important applications: enhancing nonlinear effects, improving the sensitivity of sensors, and improving the resolution of notch filters, providing a good platform for the study of quantum electrodynamics. Lithium niobate photonic crystal cavities have attracted extensive attention due to their excellent wavelength tuning capability. The ...
Claims
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Login to View More IPC IPC(8): G02B6/122G02F1/35G02F1/365
CPCG02B6/1225G02F1/3501G02F1/365
Inventor 陈玉萍葛睿陈险峰
Owner SHANGHAI JIAO TONG UNIV