Yiming Pang: InGaP-on-insulator integrated photonics for nonlinear and quantum optics

Abstract:

Second-order optical nonlinearity (x(2)) underpins a wide range of classical and quantum photonic technologies, including second-harmonic generation, optical parametric oscillation, and entangled photon-pair generation. Indium gallium phosphide (InGaP) has recently emerged as a promising x(2) material platform, owing to its large second-order nonlinear susceptibility (220 pm/V), wide bandgap (1.9 eV) that suppresses two-photon absorption at telecom wavelengths, low propagation loss, and compatibility with wafer-scale fabrication up to 100 mm. In this talk, I will present recent progress on the InGaP-on-insulator (InGaPOl) photonic platform, including the demonstration of record-low propagation losses at 1560 nm and /80 nm, highly efficient second-harmonic generation, and spontaneous parametric down-conversion in both doubly resonant and singly resonant microresonators. These advances establish InGaPOl as a versatile chip-scale platform with unprecedented performances that enables a wide range of applications in integrated nonlinear and quantum photonics. Finally, I will discuss prospects for extending these capabilities toward on-chip generation of squeezed vacuum states for quantum-enhanced sensing, as well as high-gain optical parametric amplification for low-noise classical communications.