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Dielectric Metasurfaces for Integrated Imaging Devices and Active Optical Elements


Kwon, Hyounghan (2021) Dielectric Metasurfaces for Integrated Imaging Devices and Active Optical Elements. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/j08n-0q77.


Optical dielectric metasurfaces have shown great advances in the last two decades and become promising candidates for next-generation free-space optical elements. In addition to their compatibility with scalable semiconductor fabrication technology, metasurfaces have provided new and efficient ways to manipulate diverse characteristics of light. In this thesis, we demonstrate the potential of dielectric metastructures in the realization of compact imaging devices, reconfigurable optical elements, and multi-layer inverse-designed metasurfaces. With the metasurfaces’ extreme capability to simultaneously control phase and polarization, we first showcase their potential toward optical field imaging applications. In this regard, we demonstrate a system of dielectric metasurfaces and designed random metasurfaces for single-shot phase gradient microscopes and computational complex field imaging system, respectively. Then, we propose nano-electromechanically tunable resonant dielectric metasurfaces as a general platform for active metasurfaces. For example, we demonstrate two different types of the phase and amplitude modulators. While one utilizes resonant eigenmodes in the lattice such as leaky guided mode resonances and bound-states in the continuum modes, the other is based on the high-Q Mie resonances in the dielectric nanostructures where symmetry is broken. In addition to the modulation of the phase and amplitude, we also show tuning of strong chiroptical responses in dielectric chiral metasurfaces. Next, we experimentally demonstrate inverse-designed multi-layer metasurfaces. Not only do they provide increased degree of freedom in the design space, but also overcome limits of conventional design methods of the metasurfaces. Finally, we summarize the presented works and conclude this thesis with a brief outlook on what aspects of the metasurfaces can be important for their real-world applications in the future and what challenges and opportunities remain.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Optics, Metasurfaces, Nanophotonics, NEMS
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Faraon, Andrei
Group:Kavli Nanoscience Institute
Thesis Committee:
  • Yang, Changhuei (chair)
  • Atwater, Harry Albert
  • Marandi, Alireza
  • Faraon, Andrei
Defense Date:26 April 2021
Non-Caltech Author Email:hyounghankwon (AT)
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)HR00111720035
ILJU Academy and Culture FoundationUNSPECIFIED
Record Number:CaltechTHESIS:05112021-170331252
Persistent URL:
Related URLs:
URLURL TypeDescription adapted for Chapter 2. adapted for Chapter 3. adapted for Chapter 4. adapted for parts of Chapter 7.
Kwon, Hyounghan0000-0002-9257-687X
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14140
Deposited By: Hyounghan Kwon
Deposited On:19 May 2021 15:49
Last Modified:17 May 2022 19:03

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