Polarization-controlled efficient second harmonic generation in etchless lithium niobate photonic crystals with quasi-bound states in the continuum
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We numerically investigate a high-Q resonant and etchless lithium niobate on insulators (LNOI) nanostructure based on the quasi-bound states in the continuum (q-BICs) to achieve highly efficient second harmonic generation (SHG). The proposed structure consists... ...
