Seminar Lecture Series
Wide-band Integrated Photonics for Nonlinear and Quantum Optical Applications
Xiyuan Lu, Assistant Research Scientist at the Joint Quantum Institute, University of Maryland
Wednesday, April 8, 2026
Noon–1 p.m.
601 Computer Studies Building
Abstract: This talk will cover a broad range of topics in wide-band integrated photonics, including various nonlinear and quantum optical processes across visible and telecommunications wavelengths. In nonlinear optics, I will focus on widely-separated Kerr optical parametric oscillation [1] and photo-induced second harmonic generation [2]. In quantum photonics, I will discuss visible-telecom photon pair source [3] and quantum frequency conversion [4]. I will also introduce a recent material advance of silicon nitride [5] and also an interesting device development related to photonic crystal cavity [6].
[1] X. Lu et al. “Photonic integrated circuit optical parametric oscillators”, Optica, 13, 11-30 (2026).
[2] X. Lu et al. “Efficient photo-induced second harmonic generation in silicon nitride photonics”, Nat. Photon. 15, 131-136 (2021).
[3]X. Lu et al. “Chip-integrated entangled visible-telecom photon pair sources for quantum communication,” Nat. Phys. 15, 373-381 (2019).
[4] X. Lu et al. “Proposal for noise-free visible-telecom quantum frequency conversion through third-order sum and difference frequency generation”, Opt. Lett. 46, 222-225 (2021).
[5] Z. Ma et al. “Direct Growth of Crack-Free Thick Stoichiometric Silicon Nitride Films on Sapphire for Wide-Band Photonics,” CLEO, SM4B.3 (2026).”
[6] X. Lu et al. “High-Q slow light and its localization in a photonic crystal microring”, Nat. Photon. 16, 66-71 (2022).