Plasmon-Enhanced Terahertz Photodetection in Graphene.

Title of dissertation : BROADBAND PHOTODETECTION IN GRAPHENE

Title of dissertation: BROADBAND PHOTODETECTION IN GRAPHENE Xinghan Cai, Doctor of Philosophy, 2015 Dissertation directed by: Professor, Michael S. Fuhrer, Department of Physics Graphene, a single-atom-thick plane of carbon, has unique optoelectronic properties that result in a variety of potential photonic applications, such as optical modulators, plasmonic devices and THz emitters. In this th...

Photocurrent in graphene harnessed by tunable intrinsic plasmons.

Graphene's optical properties in the infrared and terahertz can be tailored and enhanced by patterning graphene into periodic metamaterials with sub-wavelength feature sizes. Here we demonstrate polarization-sensitive and gate-tunable photodetection in graphene nanoribbon arrays. The long-lived hybrid plasmon-phonon modes utilized are coupled excitations of electron density oscillations and sub...

Terahertz and infrared photodetection using p-i-n multiple-graphene-layer structures

Nonlinear Terahertz Absorption of Graphene Plasmons.

Subwavelength graphene structures support localized plasmonic resonances in the terahertz and mid-infrared spectral regimes. The strong field confinement at the resonant frequency is predicted to significantly enhance the light-graphene interaction, which could enable nonlinear optics at low intensity in atomically thin, subwavelength devices. To date, the nonlinear response of graphene plasmon...

Scattering of terahertz radiation on a graphene-based nano-antenna

Scattering of the terahertz radiation on a graphene-based nano-antenna is considered. Different electromagnetic models of graphene are discussed and applied to calculate extinction, scattering and absorption cross sections of the nanoantenna. Scattering resonances in the terahertz band are identified as longitudinal Fabry-Perot resonances of surface plasmon polaritons supported by the graphene ...