Education & Certifications

  • BSE, University of Michigan, Materials Science and Engineering (2019)

Contact

  • Academic
    daglis@stanford.edu
    University - Student Department: Materials Science and Engineering Position: Graduate

Additional Info

  • Mail Code: 4034

All Publications

  • Universal Narrowband Wavefront Shaping with High Quality Factor Meta-Reflect-Arrays. Nano letters Lin, L., Hu, J., Dagli, S., Dionne, J. A., Lawrence, M. 2023

    Abstract

    Optical metasurfaces offer unprecedented flexibility in light wave manipulation but suffer weak resonant enhancement. Tackling this problem, we experimentally unveil a new phase gradient metasurface platform made entirely from individually addressable high quality factor (high-Q) silicon meta-atoms. Composed of pairs of nearly identical nanoblocks, these meta-atoms support dipolar-guided-mode resonances that, due to the controlled suppression of radiation loss, serve as highly sensitive phase pixels when placed above a mirror. A key novelty of this platform lies in the vanishingly small structural perturbations needed to produce universal phase fronts. Having fabricated elements with Q-factor 380 and spaced by lambda/1.2, we achieve strong beam steering, up to 59% efficient, to angles 32.3°, 25.3°, and 20.9°, with variations in nanoantenna volume fractions across the metasurfaces of ≤2.6%, instead of >50% required by traditional versions. Aside from extreme sensitivity, the metasurfaces exhibit near-field intensity enhancement over 1000*. Taken together, these properties represent an exciting prospect for dynamic and nonlinear wave shaping.

    View details for DOI 10.1021/acs.nanolett.2c04621

    View details for PubMedID 36745385

  • High-Quality-Factor Silicon-on-Lithium Niobate Metasurfaces for Electro-optically Reconfigurable Wavefront Shaping. Nano letters Klopfer, E., Dagli, S., Barton, D. 3., Lawrence, M., Dionne, J. A. 1800

    Abstract

    Dynamically reconfigurable metasurfaces promise compact and lightweight spatial light modulation for many applications, including LiDAR, AR/VR, and LiFi systems. Here, we design and computationally investigate high-quality-factor silicon-on-lithium niobate metasurfaces with electrically driven, independent control of its constituent nanobars for full phase tunability with high tuning efficiency. Free-space light couples to guided modes within each nanobar via periodic perturbations, generating quality factors exceeding 30,000 while maintaining a bar spacing of

    View details for DOI 10.1021/acs.nanolett.1c04723

    View details for PubMedID 35112873

  • High-Q nanophotonics: sculpting wavefronts with slow light NANOPHOTONICS Barton, D., Hu, J., Dixon, J., Klopfer, E., Dagli, S., Lawrence, M., Dionne, J. 2021; 10 (1): 83–88

    View details for DOI 10.1515/nanoph-2020-0510

    View details for Web of Science ID 000597359300007