Resonant waveguide gratings (RWGs), also known as guided mode resonant (GMR)
gratings or waveguide‐mode resonant gratings, are dielectric structures where these …

Silicon photonics lacks a second-order nonlinear optical (χ (2)) response in general,
because the typical constituent materials are centrosymmetric and lack inversion symmetry …

Optical metasurfaces have recently emerged as the game changer in light manipulation and
opened up new perspectives in many subfields of optics and photonics. Recent …

Resonant metasurfaces provide a unique platform for enhancing multiwave nonlinear
interactions. However, the difficulties over mode matching and material transparency place …

High quality factor optical microcavities have been employed in a variety of material systems
to enhance nonlinear optical interactions. While single-crystalline aluminum nitride …

Simultaneous Kerr comb formation and second-harmonic generation with on-chip
microresonators can greatly facilitate comb self-referencing for optical clocks and frequency …

We report the giant enhanced optical harmonic generation in all-dielectric silicon nitride
(SiN) based resonant waveguide gratings (RWGs) of quasi-bound states in the continuum …

Efficient second harmonic generation in integrated platforms is usually achieved by resonant
structures, intermodal phase-matching or quasi-phase matching by periodically poling …

Nonlinear optics is an important area of photonics research for realizing active optical
functionalities such as light emission, frequency conversion, and ultrafast optical switching …

Microresonator-based frequency comb generation at or near visible wavelengths would
enable applications in precise optical clocks, frequency metrology, and biomedical imaging …