Honors & Awards

  • Graduate Research Fellowship, NSF (2016-2018)

Education & Certifications

  • M.S., Stanford University, Applied Physics (2016)
  • S.B., Massachusetts Institute of Technology, Electrical Engineering and Physics (2014)

Stanford Advisors

All Publications

  • Single-Mode Phononic Wire. Physical review letters Patel, R. N., Wang, Z., Jiang, W., Sarabalis, C. J., Hill, J. T., Safavi-Naeini, A. H. 2018; 121 (4): 040501


    Photons and electrons transmit information to form complex systems and networks. Phonons on the other hand, the quanta of mechanical motion, are often considered only as carriers of thermal energy. Nonetheless, their flow can also be molded in fabricated nanoscale circuits. We design and experimentally demonstrate wires for phonons by patterning the surface of a silicon chip. Our device eliminates all but one channel of phonon conduction, allowing coherent phonon transport over millimeter length scales. We characterize the phononic wire optically, by coupling it strongly to an optomechanical transducer. The phononic wire enables new ways to manipulate information and energy on a chip. In particular, our result is an important step towards realizing on-chip phonon networks, in which quantum information is transmitted between nodes via phonons.

    View details for PubMedID 30095955

  • Efficient bidirectional piezo-optomechanical transduction between microwave and optical frequency. Nature communications Jiang, W., Sarabalis, C. J., Dahmani, Y. D., Patel, R. N., Mayor, F. M., McKenna, T. P., Van Laer, R., Safavi-Naeini, A. H. 2020; 11 (1): 1166


    Efficient interconversion of both classical and quantum information between microwave and optical frequency is an important engineering challenge. The optomechanical approach with gigahertz-frequency mechanical devices has the potential to be extremely efficient due to the large optomechanical response of common materials, and the ability to localize mechanical energy into a micron-scale volume. However, existing demonstrations suffer from some combination of low optical quality factor, low electrical-to-mechanical transduction efficiency, and low optomechanical interaction rate. Here we demonstrate an on-chip piezo-optomechanical transducer that systematically addresses all these challenges to achieve nearly three orders of magnitude improvement in conversion efficiency over previous work. Our modulator demonstrates acousto-optic modulation with [Formula: see text] = 0.02 V. We show bidirectional conversion efficiency of [Formula: see text] with 3.3 μW  red-detuned optical pump, and [Formula: see text] with 323 μW blue-detuned pump. Further study of quantum transduction at millikelvin temperatures is required to understand how the efficiency and added noise are affected by reduced mechanical dissipation, thermal conductivity, and thermal capacity.

    View details for DOI 10.1038/s41467-020-14863-3

    View details for PubMedID 32127538

  • Cryogenic packaging of an optomechanical crystal OPTICS EXPRESS McKenna, T. P., Patel, R. N., Witmer, J. D., Van Laer, R., Valery, J. A., Safavi-Naeini, A. H. 2019; 27 (20): 28782–91
  • Lithium niobate piezo-optomechanical crystals OPTICA Jiang, W., Patel, R. N., Mayor, F. M., Mckenna, T. P., Arrangoiz-Arriola, P., Sarabalis, C. J., Witmer, J. D., Van Laer, R., Safavi-Naeini, A. H. 2019; 6 (7): 845–53
  • Diamond optomechanical crystals with embedded nitrogen-vacancy centers QUANTUM SCIENCE AND TECHNOLOGY Cady, J., Michel, O., Lee, K. W., Patel, R. N., Sarabalis, C. J., Safavi-Naeini, A. H., Jayich, A. 2019; 4 (2)
  • High-quality Lithium Niobate Optomechanical Crystal Jiang, W., Patel, R. N., Mayor, F. M., McKenna, T. P., Arrangoiz-Arriola, P., Sarabalis, C. J., Van Laer, R., Safavi-Naeini, A. H., IEEE IEEE. 2019
  • Electro-Optics with Gigahertz Phonons in Silicon Photonics Van Laer, R., Patel, R. N., Witmer, J. D., McKenna, T. P., Safavi-Naeini, A. H., IEEE IEEE. 2019
  • Engineering Phonon Leakage in Nanomechanical Resonators Physical Review Applied Patel, R. N., Sarabalis, C. J., Jiang, W., Hill, J. T., Safavi-Naeini, A. H. 2017; 8 (4)
  • Efficient photon coupling from a diamond nitrogen vacancy center by integration with silica fiber. Light, science & applications Patel, R. N., Schröder, T., Wan, N., Li, L., Mouradian, S. L., Chen, E. H., Englund, D. R. 2016; 5 (2): e16032


    A central goal in quantum information science is to efficiently interface photons with single optical modes for quantum networking and distributed quantum computing. Here, we introduce and experimentally demonstrate a compact and efficient method for the low-loss coupling of a solid-state qubit, the nitrogen vacancy (NV) center in diamond, with a single-mode optical fiber. In this approach, single-mode tapered diamond waveguides containing exactly one high quality NV memory are selected and integrated on tapered silica fibers. Numerical optimization of an adiabatic coupler indicates that near-unity-efficiency photon transfer is possible between the two modes. Experimentally, we find an overall collection efficiency between 16% and 37% and estimate a single photon count rate at saturation above 700 kHz. This integrated system enables robust, alignment-free, and efficient interfacing of single-mode optical fibers with single photon emitters and quantum memories in solids.

    View details for PubMedID 30167144

    View details for PubMedCentralID PMC6062425