Thin film lithium niobate (TFLN), also known as lithium niobate on insulator (LNOI), is an
important integrated optical platform due to its broad transparency window (from ultraviolet …

Here we demonstrate the efficient photon-pair generation via spontaneous parametric down
conversion from a semiconductor metasurface supporting dual quasibound states in the …

Photonic bound states in the continuum (BIC) promise a versatile platform for construction of
optical resonators with highly confined electromagnetic fields and ultralong radiative lifetime …

In order to address the issue of high loss and low field effect in the generation process of
traditional second harmonic, we employ lithium niobate (LN), a highly efficient nonlinear …

Merging bound states in the continuum (BICs) has significant promise for wave manipulation
since it can provide an ultrahigh Q factor when compared to the isolated BICs. However, the …

Bulk transition metal dichalcogenides (TMDs) have found widespread applications on
nanophotonics, condensed matter physics, and quantum optics, due to their high refractive …

All-dielectric metasurfaces associated with the physics of bound states in the continuum
(BICs) provide a novel platform to enhance nonlinear effects at the nanoscale. In this work …

In recent years, bound states in the continuum (BICs) in the all-dielectric metasurfaces have
attracted considerable attention due to the low radiation loss and large quality factor (Q …

Bound states in the continuum (BICs) with an infinite quality factor (Q factor) and lifetime are
demonstrated as far-field polarization singularities in momentum space. Unidirectional …

Ultracompact devices engineered for second-harmonic generation (SHG) hold a significant
promise across a diverse spectrum of applications. Here, we propose a merging bound state …