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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. 

Group Lead

Kartik Srinivasan portrait

Research Publications

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  • Numerical simulations of a circular Bragg grating microcavity (top) [Davanco et al, Appl. Phys. Lett, 2011] and a slot-mode optomechanical resonator (middle and bottom) [Davanco et al, Optics Express, 2012].
  • Proposed microwave-to-optical quantum transducer based on a coupled piezoelectric and optomechanical resonator system (Wu et al, Phys Rev. Applied, 2020).
  • Concept of spectral translation - a near-infrared pump mediates translation of an input signal in the telecom to an output in the visible (Lu et al, Nature Photonics, 2019).
  • Time-energy entangled photons in a microring resonator are created so that one photon is resonant with the optical transition in a quantum memory (left), while the other is in the telecom band (Lu et al, Nature Physics, 2019).


  • a grayscale scanning electron microscope image of a new kind of photonic device used for trapping light

    Two Light-Trapping Techniques Combine for the Best of Both Worlds

    January 3, 2023

    Taming rays of light and bending them to your will is tricky business. Light travels fast and getting a good chunk of it to stay in one place for a long time requires a lot of skillful coaxing. But the benefits of learning how to hold a moonbeam (or, more likely, a laser beam) in your hand, or on a convenient chip, are enormous. Trapping and controlling light on a chip can enable better lasers, sensors that help self-driving cars “see,” the creation of quantum-entangled pairs of photons that can be used for secure communication, and fundamental studies of the basic interactions between light and atoms—just to name a few.

  • Whispering gallery modes exhibiting half-integer optical angular momentum

    Half-integer optical angular momentum and mode orientation control in photonic crystal microrings

    December 1, 2022

    We demonstrate how control of a photonic crystal patterning applied to a microring resonator can lead to novel states of light.

  • A chip-integrated optical parametric oscillator in the 2 um wavelength band

    Infrared optical parametric oscillation using a photonic crystal microring

    August 31, 2022

    We demonstrate a chip-integrated optical parametric oscillator in the 2 um wavelength band, through use of a photonic crystal microring resonator.

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