Demonstration of critical coupling in an active III-nitride microdisk photonic circuit on silicon.

ABSTRACT: On-chip microlaser sources in the blue constitute an important building block for complex integrated photonic circuits on silicon. We have developed photonic circuits operating in the blue spectral range based on microdisks and bus waveguides in III-nitride on silicon. We report on the interplay between microdisk-waveguide coupling and its optical properties. We observe critical coupling and phase matching, i.e. the most efficient energy transfer scheme, for very short gap sizes and thin waveguides (g = 45 nm and w = 170 nm) in the spontaneous emission regime. Whispering gallery mode lasing is demonstrated for a wide range of parameters with a strong dependence of the threshold on the loaded quality factor. We show the dependence and high sensitivity of the output signal on the coupling. L

SUBMITTER: Tabataba-Vakili F 

PROVIDER: S-EPMC6889465 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature