Many breakthroughs in technologies are closely associated with the deep understanding
and development of new material platforms. As the main material used in microelectronics …

The commercial success of radio-frequency acoustic filters in wireless communication
systems has launched aluminum nitride (AlN) as one of the most widely used …

Kerr soliton microcombs have recently emerged as a prominent topic in integrated photonics
and have enabled new horizons for optical frequency metrology. Kerr soliton microcombs …

Frequency microcombs, alternative to mode-locked laser and fiber combs, enable miniature
rulers of light for applications including precision metrology, molecular fingerprinting and …

Integrated photonics based on silicon has drawn a lot of interests, since it is able to provide
compact solution for functional devices, and its fabrication process is compatible with the …

Widely tunable coherent sources are desirable in nanophotonics for a multitude of
applications ranging from communications to sensing. The mid-infrared spectral region …

Materials with strong second-order (χ^(2)) optical nonlinearity, especially lithium niobate,
play a critical role in building optical parametric oscillators (OPOs). However, chip-scale …

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

We report a new class of optical parametric oscillators, based on a 20-μm-long
semiconductor photonic crystal cavity and operating at telecom wavelengths. Because the …

Dissipative Kerr solitons (DKSs) in integrated microresonators have enabled breakthroughs
in sensing, communication, and signal processing. So far, integrated DKS sources have …