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We experimentally demonstrate high-contrast, ultrafast switching of infrared light at 2.1 μm via intraband pumping of a high quality factor perfect absorber made from a highly doped cadmium oxide thin film.
Second order nonlinearity vanishes for centrosymmetric materials in the dipole approximation. For metamaterial this means second-harmonic-generation is negligible in highly symmetric meta-atoms. We show a new type of meta-atom in which the dipolar approximation breaks down.
Using a high-electron-mobility cadmium oxide perfect absorber and intraband optical pumping, we experimentally demonstrate a reflective polarizer with a polarization extinction ratio of 91 that can be switched on and off within 800 fs.
We experimentally demonstrated an epsilon-near-zero (ENZ) mode in an n-doped GaAs layer at 0.8 THz and study its ultrafast dynamics using optical pump terahertz probe spectroscopy. Notable plasmon damping was observed upon optical pumping.
We experimentally observe large enhancement of second-harmonic generation (SHG) from GaAs metasurfaces. The SHG polarization when excited at the electric and magnetic dipole resonances is orthogonal and can be attributed to different nonlinear generation mechanisms.
We present an experimental demonstration of a metasurface analogue of electromagnetically induced transparency based on silicon instead of lossy plasmonic metal, therefore achieved a record-high quality factor of 483 and a sensing figure-of-merit of 103.
In this talk, I will discuss our recent efforts to develop purely dielectric metamaterials possessing low absorption loss at optical frequencies. I will discuss implementations ranging from wavefront control to high Q-factor resonances.
We present an experimental demonstration of an optical metamaterial with a nearly isotropic low-index response, leading to angular selectivity of transmission and enhanced directive emission from quantum dots placed within the metamaterial.
We propose an optical lens that focuses light from all angles of incidence to a singular point based on a lossy anisotropic ε-near-zero metamaterial. Full-wave numerical simulations are carried out with realistic material properties.
We investigate resonant transmission of planar asymmetric metamaterials made from double split-ring resonators. More than 50% amplitude modulation is observed at the fundamental inductive-capacitive resonance due to circular polarization conversion.
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