Doubly resonant χ (2) nonlinear photonic crystal cavity based on a bound state in the continuum
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Photonic nanostructures simultaneously maximizing spectral and spatial overlap between fundamental and second-harmonic confined modes are highly desirable for enhancing second-order nonlinear effects in nonlinear media. These conditions have thus far remained challenging to satisfy in photonic crystal cavities because of the difficulty in designing a band gap at the second-harmonic frequency. Here, we solve this issue by using instead a bound state in the continuum at that frequency, and we design a doubly-resonant photonic crystal slab cavity with strongly improved figures of merit for nonlinear frequency conversion when compared to previous photonic crystal designs. Furthermore, we show that the far-field emission at both frequencies is highly collimated around normal incidence, which allows for simultaneously efficient pump excitation and collection of the generated nonlinear signal. Our results could lead to unprecedented conversion efficiencies in both parametric down conversion and second harmonic generation in an extremely compact architecture.
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A normalized conversion efficiency of 1160%/W·cm^2 was achieved in a 5 mm SiNx loaded waveguide on PPLN by engineering the cross section to limit leakage.
“In the former case, high normalized conversion efficiency of 1160%/W•cm 2 was achieved in a 5 mm SiN x loaded waveguide on PPLN through engineering the waveguide cross section to limit leakage of the fundamental TE mode to TM slab modes [322].”
From Integrated photonics on thin-film lithium niobate (2021) · cites this paper as [322]
Ultrahigh normalized conversion efficiencies have been achieved in SiNx loaded waveguides and monolithic LN ridge waveguides via type-0 QPM.
“To date, ultrahigh normalized conversion efficiencies have been achieved in both SiN x loaded waveguides and monolithic LN ridge waveguides via type-0 quasi-phase matching.”
From Integrated photonics on thin-film lithium niobate (2021) · cites this paper as [322]
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- Authors
- Minkov, M., Gerace, D., & Fan, S.
- Affiliations
- Stanford University (US)
- University of Pavia (IT)
- Venue
- Optica
- Publisher
- Optica Publishing Group
- Published
- 2019-08-08
- Volume
- 6
- Issue
- 8
- Pages
- 1039
- ISSN
- 2334-2536 (ISSN-L)
- OpenAlex
- W2965904245
- Cited by
- 134
- References
- 38
- Citations by year
- 2026: 14 · 2025: 18 · 2024: 19 · 2023: 16 · 2022: 21 · 2021: 27 · 2020: 17 · 2019: 2
- FWCI
- 7.37
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optica (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Figshare (submittedVersion, public-domain)
- arXiv (Cornell University)
- Funders
- Air Force Office of Scientific Research (AFOSR) (FA9550-17-1-0002)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (SNF) (P300P2_177721)
- Horizon 2020 Framework Programme (H2020) (QuantERA ERA-NET Cofund in Quantum Technologies project CUSPIDOR)
- Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photonic Crystals and Applications
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photorefractive and Nonlinear Optics
- Keywords
- bound states in the continuum, photonic crystal cavities, second harmonic generation, second-order nonlinear optics, parametric down-conversion, doubly resonant cavity, photonic crystal slabs, nonlinear frequency conversion
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