Doubly resonant second-harmonic generation of a vortex beam from a bound state in the continuum

Abstract

Second harmonic generation in nonlinear materials can be greatly enhanced by realizing doubly-resonant cavities with high quality factors. However, fulfilling such doubly resonant condition in photonic crystal (PhC) cavities is a long-standing challenge, because of the difficulty in engineering photonic bandgaps around both frequencies. Here, by implementing a second-harmonic bound state in the continuum (BIC) and confining it with a heterostructure design, we show the first doubly-resonant PhC slab cavity with $2.4\times 10^{-2}$ W${}^{-1}$ conversion efficiency under continuous wave excitation. We also report the confirmation of highly normal-direction concentrated far-field emission pattern with radial polarization at the second harmonic frequency. These results represent a solid verification of previous theoretical predictions and a cornerstone achievement, not only for nonlinear frequency conversion but also for vortex beam generation and prospective nonclassical sources of radiation.

arXiv commentrevtex4-2, 7 pages, 5 figures, conference CLEO

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• Post-2000 Nonlinear Optical Materials and Measurements: Data Tables and Best Practices
• Realization of room temperature polaritonic vortex in momentum space with hybrid Perovskite metasurface
• Observation of bound states in the continuum embedded in symmetry bandgaps
• Quantum nondemolition measurements with optical parametric amplifiers for ultrafast universal quantum information processing
• Topologically protected second-harmonic generation via doubly resonant high-order photonic modes
• A chip-scale second-harmonic source via injection-locked all-optical poling
• Temporal trapping: a route to strong coupling and deterministic optical quantum computation
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• Ultrabroadband Milliwatt-Level Resonant Frequency Doubling on a Chip
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• Reciprocal Quantum Electrodynamics with Bound States in the Continuum