Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion

Abstract

We exploit recently developed topology-optimization techniques to design complex, wavelength-scale resonators for enhancing various nonlinear ${\chi }^{(2)}$ and ${\chi }^{(3)}$ frequency conversion processes. In particular, we demonstrate aperiodic, multi-track ring resonators and 2D slab microcavities exhibiting long lifetimes $Q\gtrsim 10^4$, small modal volumes $V\gtrsim (\lambda /2n{)}^3$, and among the largest nonlinear overlaps (a generalization of phase matching in large-etalon waveguides) possible, paving the way for efficient, compact, and wide-bandwdith integrated nonlinear devices.

References in corpus (4)

• Visible-to-telecom quantum frequency conversion of light from a single quantum emitter
• Integrated high quality factor lithium niobate microdisk resonators
• Second harmonic generation in phase matched aluminum nitride waveguides
• Multimode nanobeam cavities for nonlinear optics: high quality resonances separated by an octave

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