All Publications


  • Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate OPTICS EXPRESS Mishra, J., Jankowski, M., Hwang, A. Y., Stokowski, H. S., McKenna, T. P., Langrock, C., Ng, E., Heydari, D., Mabuchi, H., Safavi-Naeini, A. H., Fejer, M. M. 2022; 30 (18): 32752-32760

    View details for DOI 10.1364/OE.467580

    View details for Web of Science ID 000850229100099

  • Ultra-low-power second-order nonlinear optics on a chip. Nature communications McKenna, T. P., Stokowski, H. S., Ansari, V., Mishra, J., Jankowski, M., Sarabalis, C. J., Herrmann, J. F., Langrock, C., Fejer, M. M., Safavi-Naeini, A. H. 2022; 13 (1): 4532

    Abstract

    Second-order nonlinear optical processes convert light from one wavelength to another and generate quantum entanglement. Creating chip-scale devices to efficiently control these interactions greatly increases the reach of photonics. Existing silicon-based photonic circuits utilize the third-order optical nonlinearity, but an analogous integrated platform for second-order nonlinear optics remains an outstanding challenge. Here we demonstrate efficient frequency doubling and parametric oscillation with a threshold of tens of micro-watts in an integrated thin-film lithium niobate photonic circuit. We achieve degenerate and non-degenerate operation of the parametric oscillator at room temperature and tune its emission over one terahertz by varying the pump frequency by hundreds of megahertz. Finally, we observe cascaded second-order processes that result in parametric oscillation. These resonant second-order nonlinear circuits will form a crucial part of the emerging nonlinear and quantum photonics platforms.

    View details for DOI 10.1038/s41467-022-31134-5

    View details for PubMedID 35927246

  • High-bandwidth CMOS-voltage-level electro-optic modulation of 780 nm light in thin-film lithium niobate OPTICS EXPRESS Celik, O., Sarabalis, C. J., Mayor, F. M., Stokowski, H. S., Herrmann, J. F., McKenna, T. P., Lee, N. A., Jiang, W., Multani, K. S., Safavi-Naeini, A. H. 2022; 30 (13): 23177-23186

    View details for DOI 10.1364/OE.460119

    View details for Web of Science ID 000813479600073

  • High-efficiency second harmonic generation of blue light on thin-film lithium niobate. Optics letters Park, T., Stokowski, H. S., Ansari, V., McKenna, T. P., Hwang, A. Y., Fejer, M. M., Safavi-Naeini, A. H. 2022; 47 (11): 2706-2709

    Abstract

    The strength of interactions between photons in a chi(2) nonlinear optical waveguide increases at shorter wavelengths. These larger interactions enable coherent spectral translation and light generation at a lower power, over a broader bandwidth, and in a smaller device: all of which open the door to new technologies spanning fields from classical to quantum optics. Stronger interactions may also grant access to new regimes of quantum optics to be explored at the few-photon level. One promising platform that could enable these advances is thin-film lithium niobate (TFLN), due to its broad optical transparency window and possibility for quasi-phase matching and dispersion engineering. In this Letter, we demonstrate second harmonic generation of blue light on an integrated thin-film lithium niobate waveguide and observe a conversion efficiency of eta0=33, 000%/W-cm2, significantly exceeding previous demonstrations.

    View details for DOI 10.1364/OL.455046

    View details for PubMedID 35648910

  • Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire OPTICA Mishra, J., McKenna, T. P., Ng, E., Stokowski, H. S., Jankowski, M., Langrock, C., Heydari, D., Mabuchi, H., Fejer, M. M., Safavi-Naeini, A. H. 2021; 8 (6): 921-924
  • Fully-Resonant Second Harmonic Generation in Periodically Poled Thin-Film Lithium Niobate McKenna, T. P., Stokowski, H. S., Ansari, V., Mishra, J., Jankowski, M., Sarabalis, C. J., Herrmann, J. F., Langrock, C., Fejer, M. M., Safavi-Naeini, A. H., IEEE IEEE. 2021
  • Mid-infrared nonlinear optics in thin-film lithium niobate on sapphire Mishra, J., McKenna, T. P., Ng, E., Stokowski, H. S., Jankowski, M., Langrock, C., Heydari, D., Mabuchi, H., Safavi-Naeini, A. H., Fejer, M. M., IEEE IEEE. 2021
  • Optical Parametric Oscillator in Thin-Film Lithium Niobate with a 130 mu W Threshold Stokowski, H. S., McKenna, T. P., Ansari, V., Mishra, J., Jankowski, M., Sarabalis, C. J., Herrmann, J. F., Langrock, C., Fejer, M. M., Safavi-Naeini, A. H., IEEE IEEE. 2021
  • Determination of Fermi Level Position at the Graphene/GaN Interface Using Electromodulation Spectroscopy ADVANCED MATERIALS INTERFACES Herman, A. P., Janicki, L., Stokowski, H. S., Rudzinski, M., Rozbiegala, E., Sobanska, M., Zytkiewicz, Z. R., Kudrawiec, R. 2020
  • Development of a Millimeter-Wave Transducer for Quantum Networks Multani, K. S., Stokowski, H., Snively, E., Patel, R., Jiang, W., Lee, N., Welander, P. B., Nanni, E. A., Safavi-Naeini, A. H., IEEE IEEE. 2020
  • Depletion Layer Built-In Field at (1-100), (0001), and (000-1) GaN/Water Junction and Its Role in Semiconductor Nanowire Water Splitting ADVANCED MATERIALS INTERFACES Stokowski, H., Janicki, L., Serafinczuk, J., Siekacz, M., Skierbiszewski, C., Kudrawiec, R. 2019; 6 (4)
  • Origin and annealing of deep-level defects in GaNAs grown by metalorganic vapor phase epitaxy JOURNAL OF APPLIED PHYSICS Gelczuk, L., Stokowski, H., Dabrowska-Szata, M., Kudrawiec, R. 2016; 119 (18)

    View details for DOI 10.1063/1.4949514

    View details for Web of Science ID 000377717500052

  • Bi-induced acceptor level responsible for partial compensation of native free electron density in InP1-xBix dilute bismide alloys JOURNAL OF PHYSICS D-APPLIED PHYSICS Gelczuk, L., Stokowski, H., Kopaczek, J., Zhang, L., Li, Y., Wang, K., Wang, P., Wang, S., Kudrawiec, R. 2016; 49 (11)