Education & Certifications
BSE, University of Michigan, Materials Science and Engineering (2019)
Universal Narrowband Wavefront Shaping with High Quality Factor Meta-Reflect-Arrays.
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.
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
2021; 10 (1): 83–88
View details for DOI 10.1515/nanoph-2020-0510
View details for Web of Science ID 000597359300007