Person:
Cai, Wenshan

Permanent Link
https://hdl.handle.net/1853/71133
Associated Organization(s)
ORCID
ArchiveSpace Name Record

Filters

3
2014 - 2019 2 2020 - 2021 1
3
3
3
3
Reset filters

Settings

Publication Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Field- and Carrier-Facilitated Nonlinear Nano-Optics
    (Georgia Institute of Technology, 2021-09-14) Cai, Wenshan
    Engineered photonic nanostructures offer the exciting potential to create customized nonlinear optical media with tailored high-order effects, which are essential to the active control of light and the generation of new spectral components. Leveraging the electrical and optical functions simultaneously supported in certain nanophotonic systems, we can realize externally triggered and dynamically controllable light-matter interactions for nonlinear optical generation and signal processing. In particular, we harness the transient disruption of the inversion symmetry for second-order optical processes, and facilitate the hot-carrier-induced perturbation of the dielectric permittivity for all-optical control of light. Such effects are exploited in a variety of nanophotonic platforms, including plasmonic structures, dielectric metasurfaces, and two-dimensional crystals. Our studies reveal a grand opportunity to exploit photonic nanostructures as self-contained platforms with intrinsically embedded electrical functionality and optical nonlinearity, and conversely, to elucidate the dynamics of carrier generation and transport via nonlinear optical means.
  • No Thumbnail Available
    Item
    Optical Metamaterials: From Linear Responses to Nonlinear Interactions and Beyond
    (Georgia Institute of Technology, 2014-11-11) Cai, Wenshan
    Metamaterials are commonly viewed as artificially-structured media capable of realizing arbitrary effective parameters, in which metals and dielectrics are delicately combined to facilitate the index contrast and plasmonic response required for a particular purpose. We aim to drive beyond this limited vision and explore the use of optical metamaterials as a generalizable platform for optoelectronic information technology: Metals will provide tailored plasmonic behavior as before, but will serve double duty by providing electrical functions including voltage input, carrier injection/extraction, and heat sinking, and dielectrics will consist of functional elements such as Kerr materials, electrooptic polymers, and p-n junctions. In this talk I will discuss our preliminary results on several topics in this category, including the electrically induced harmonic generation and optical rectification of light in a perfect metamaterial absorber, the nonlinear spectroscopy and imaging from a chiral metamaterial, and the backward phase-matching in an optical metamaterial where the fundamental and frequency-doubled waves possess opposite indices of refraction.
  • No Thumbnail Available
    Item
    Optical Metamaterials: From Linear Responses to Nonlinear Interactions and Beyond
    (Georgia Institute of Technology, 2014-10-06) Cai, Wenshan
    Metamaterials are commonly viewed as artificially-structured media capable of realizing arbitrary effective parameters, in which metals and dielectrics are delicately combined to facilitate the index contrast and plasmonic response required for a particular purpose. We aim to drive beyond this limited vision and explore the use of optical metamaterials as a generalizable platform for optoelectronic information technology: Metals will provide tailored plasmonic behavior as before, but will serve double duty by providing electrical functions including voltage input, carrier injection/extraction, and heat sinking, and dielectrics will consist of functional elements such as Kerr materials, electrooptic polymers, and p-n junctions. In this talk I will discuss our preliminary results on several topics in this category, including the electrically induced harmonic generation and optical rectification of light in a perfect metamaterial absorber, the nonlinear spectroscopy and imaging from a chiral metamaterial, and the backward phase-matching in an optical metamaterial where the fundamental and frequency-doubled waves possess opposite indices of refraction.