Multi-mode microcavity frequency engineering through a shifted grating in a photonic crystal ring
7 November 2023
Usman A. Javid,
SGMMS splits multiple modes by shifting a single-period grating, enabling multi-mode frequency engineering
Avoids complex multi-frequency grating modulation for mode splitting
Maintains high optical quality factors with large shifts
Enables optical parametric oscillation across multiple pump wavelengths
Simpler fabrication than apodized or chirped gratings
Frequency engineering in microrings through shifted gratings
This paper introduces a new technique called shifted grating multiple mode splitting (SGMMS) to control the frequencies of multiple whispering gallery modes in a microring resonator. By shifting a single-period grating imprinted on the inner boundary, rotational asymmetry splits the frequencies of adjacent modes without complex multi-frequency modulation. This enables multi-mode frequency engineering for nonlinear optics like optical parametric oscillation, while maintaining high quality factors and simple fabrication.
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