Publications

Showing 188 results for Author: Ivan I. Kravchenko

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  • Aug, 2026

    Journal

    Spectrometer-free quantitative vapor sensing and classification via spatiotemporal imaging of porous silicon metasurfaces

    Metasurfaces offer a compact platform for optical vapor sensing, but their practical deployment has been limited by weak evanescent light–matter interactions and reliance on spectrally resolved instrumentation. Here, we report porous silicon (pSi) metasurfaces for spectrometer-free quantitative detection of volatile organic compounds (VOCs) with strongly enhanced light–mat…

  • Aug, 2026

    Conference Paper

    Injection Locking Dynamics of Oscillation Loop with Saturable Gain

    We analytically derive and experimentally verified the injection-locking range and phase-noise suppression ratio of an oscillation loop with saturable gain, establishing a general and straightforward approach for analyzing injection locking dynamics.

  • Aug, 2026

    Conference Paper

    Nonlocal Metasurface with Resonance-Selective Nonlinear Wavefront Shaping

    We demonstrate a nonlinear nonlocal metasurface supporting quasi-trapped modes that enable helicity-dependent wavefront shaping at third-harmonic wavelengths. The geometric phase is selectively modified near resonance, revealing a mechanism for polarization-dependent nonlinear phase control.

  • Jul, 2026

    Conference Paper

    Underwater Imaging via Wide Field of View Metalens

    We demonstrate a metasurface-based platform for underwater imaging in the blue range, enabling wavefront shaping and capturing images through scattering and absorbing media. Engineered metalenses achieve ultra-wide, 170° field-of-view performance for underwater imaging.

  • Jun, 2026

    Journal

    On-Chip Cavity Electroacoustics Using Lithium Niobate Phononic Crystal Resonators

    Mechanical systems are pivotal in quantum technologies because of their long coherent time and versatile coupling to qubit systems. So far, the coherent and dynamic control of gigahertz-frequency mechanical modes mostly relies on optomechanical coupling and piezoelectric coupling to superconducting qubits. Here, we demonstrate on-chip cavity electroacoustic dynamics using…

  • Jun, 2026

    Journal

    Topological shaping of vortex neutron beams using forked phase gratings

    Beams of light or matter that carry well-defined states of orbital angular momentum (OAM) are promising probes of topological and textured condensed matter systems such as magnetic skyrmions. Using spin-echo small-angle neutron scattering, a phase-sensitive technique that allows for a relatively low intensity beam, we demonstrate the production of vortex neutron beams from…

  • Mar, 2026

    Conference Paper

    Vertical GaN Superjunction Diode on Sapphire with Kilovolt Dynamic Breakdown Voltage

    The development of superjunction structures for use in vertical wide bandgap power devices promise to break the 1-D material limits. Additionally, the possibility of utilizing heteroepitaxial GaN-on-Sapphire wafer for vertical devices can significantly trim the material and device cost. This work introduces a quasi-vertical GaN-on-Sapphire superjunction PN diode design uti…

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