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- W2891118160 abstract "Quadratic optical parametric processes form the foundation for various applications related to classical and quantum frequency conversion, and have attracted significant interest recently in on-chip implementation. These processes rely on phase matching among the interacting guided modes, and refractive index engineering is a primary approach for this purpose. Unfortunately, modal phase-matching approaches developed so far only produce parametric generation with fairly low efficiencies, due to the intrinsic modal mismatch of spatial symmetries. Here, a universal design and operation principle is proposed for highly efficient optical parametric generation on integrated photonic platforms. By breaking the spatial symmetry of the optical nonlinearity of the device, nonlinear parametric interactions can be dramatically enhanced. This principle is then employed to design and fabricate a heterogeneous titanium oxide/lithium niobate nanophotonic waveguide that is able to offer second-harmonic generation with a theoretical normalized conversion efficiency as high as 2900 % W − 1 cm − 2 , which enables the measurement of an experimental efficiency of 650 % W − 1 cm − 2 , significantly beyond the reach of conventional modal phase-matching approaches. Unlike nonlinearity domain engineering that is material selective, the proposed operation principle can be flexibly applied to any other on-chip quadratic nonlinear platform, to support ultra-highly efficient optical parametric generation." @default.
- W2891118160 created "2018-09-27" @default.
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- W2891118160 date "2019-01-11" @default.
- W2891118160 modified "2023-10-16" @default.
- W2891118160 title "Semi‐Nonlinear Nanophotonic Waveguides for Highly Efficient Second‐Harmonic Generation" @default.
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- W2891118160 doi "https://doi.org/10.1002/lpor.201800288" @default.
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