Doubly Resonant Second Harmonic Generation in Photonic Crystal Cavities via Bound States in the Continuum

Marco Clementi,Andrea Barone,Jun Wang,Momchil Minkov,Jean-François Carlin,Nicolas Grandjean,Shanhui Fan,Romuald Houdré,Dario Gerace,Matteo Galli

Frontiers in Optics（2020）

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摘要

We experimentally demonstrate doubly resonant second harmonic generation in gallium nitride photonic crystal cavities. The second harmonic mode is confined via a bound state in the continuum, which yields a radially polarized vortex beam.

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