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We propose a plasmon resonator consisting of a cylindrical hole in a metal film that supports whispering gallery type surface plasmon polariton modes exhibiting record-high quality factors (>750) in the visible frequency range.
Manipulating ultraviolet light presents unique challenges in technology. Here we demonstrate circular polarization selection at ultraviolet wavelengths over subwavelength distances using a flat-optical device consisting of Al chiral nanospirals periodically patterned on a glass substrate.
We present results on the relaxation dynamics of photoexcited carriers in MoS2 using optical-pump terahertz-probe spectroscopy. Our measurements indicate that carrier recombination is accelerated at low temperatures where defect-assisted recombination becomes more efficient.
We present results on the relaxation dynamics of photoexcited carriers in graphene using optical-pump terahertz-probe spectroscopy. Our measurements indicate that carrier cooling is extremely slow at low temperatures where electron-optical phonon cooling becomes inefficient.
We present experimental results on the optical absorption spectrum of graphene from near-IR to THz frequencies for the first time. At near-IR and mid-IR wavelengths the interband optical absorption is found to have a flat spectrum consistent with the relativistic massless Dirac-Fermion energy dispersion relation of electrons and holes in graphene. At THz frequencies intraband absorption dominates...
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