Cavity optomechanical device
We are interested in the physics and engineering of nanophotonic devices in the context of quantum information science, metrology, communications, and sensing. We use nanofabrication technology to develop engineered geometries that strongly enhance light-matter interactions, such as parametric nonlinear optical processes, coupling to quantum emitters, and acousto-optic effects. We study the basic device-level physics and tailor devices for specific applications, and our research generally involves computational modeling, nanofabrication, and optoelectronic and quantum photonic characterization. Recent topics have included quantum frequency conversion, single-photon and entangled-photon generation, microresonator frequency combs, optical parametric oscillators, and cavity electro-optomechanical transducers.
More generally, nanophotonic systems offer us the ability to study interesting physics in a controllable way, using platforms that are inherently suitable for the development of new technologies. Our labs are at the National Institute of Standards and Technology (NIST) in Gaithersburg, MD, and the Joint Quantum Institute at the University of Maryland in College Park.
Shifted photonic crystal microrings and their application nonlinear nanophotonics
We demonstrate that a simple spatial shift of the position of a single period grating in a photonic crystal ring enables frequency control over multiple ring modes, and showcase its use in microresonator optical parametric oscillation.
Towards arbitrary dispersion engineering for broadband microcombs
We present an approach for near-arbitrary dispersion engineering of photonic crystal microrings used in microresonator frequency combs.
Usman Javid
Usman Javid is a postdoctoral researcher working at UMD and NIST. He received a B.S. in Electrical Engineering from National University of Sciences and Technology in Pakistan. He earned a PhD in Optics from University of Rochester. His dissertation focused on developing optical quantum simulation tools on the lithium niobate nanophotonic platform. Currently, he is working nonlinear wave-mixing interactions on chips. including optical frequency combs for clockwork operations and parametric oscillators.
Upcoming CLEO talks from our lab and its collaborators
Schedule of our talks at CLEO 2023
High-performance optical parametric oscillator on a silicon photonic chip
We report on a silicon photonics optical parametric oscillator with an unprecedented level of performance in terms of output power and efficiency.
Developing chip-integrated optical parametric oscillators as visible and near-infrared lasers
We report on the development of chip-integrated optical parametric oscillators as coherent light sources for quantum applications.
Orbital angular momentum generation in high-Q photonic crystal microrings
We demonstrate how to generate high orbital angular momentum states from a photonic crystal microring while maintaining high cavity quality factors.
New geometries for high-Q photonic crystal ring resonators
We demonstrate two new photonic crystal ring geometries that support high quality factor, slow light, and strong mode localization through defect incorporation.
Ultra-low loss quantum photonic circuits with single quantum emitters
New article reporting the demonstration of ultra-low loss quantum photonic circuits integrated with single quantum emitters.