Surface Plasmon polaritons have long been utilized to enhance and confine optical fields at the nanoscale. They have been proven effective in the control and enhancement of optical processes at metal-dielectric boundaries with a variety of applications including nonlinear optics. In this paper we review the application of plasmonic metasurfaces to enhance non-linear processes on semiconductors, crystals, 2-D materials (graphene) and in the metal itself forming the metasurface. We consider applications such as harmonic generation, the generation of vortex beams, and the enhancement of nonlinear processes in 2D materials (graphene).
This paper studies the role of plasmonic modes for guided-wave propagation of THz/far infrared in metalclad
planar waveguides, including metal-dielectric interfaces, dielectric-loaded metal slabs and parallel plate
waveguides. The dispersion of modal characteristics of the plasmonic guided waves, such as the effective index,
attenuation constant and the field confinement, as a function of geometrical features for different consisting
materials and wavelengths are examined. Moreover, comparison is made between the THz plasmonic modes to
their optical counterparts at visible/near infrared within the similar physical structures. Peculiar features of
each structure are highlighted and regimes of interest are distinguished.
This paper investigates the use of plasmonic optical waveguides in superconductive traveling-wave photodetectors
(STWPDs) as a promising technique to efficiently couple the input optical field into the superconducting detecting
structures. Field analysis is employed to study the propagation of the light through the integrated device and
the coupling of optical power from the plasmonic waveguide to the superconducting film as a function of physical
dimensions of the guide. A sample plasmonic waveguide, based on the LaAlO3-YBCO-Au multilayer, will be
discussed in detail and important design rules are addressed.
The ultrafast and sensitive detection of an optical beat signal generated from an optical heterodyne system in
an integrated traveling-wave photoconductive detector with high-temperature superconducting (HTS) coplanar
electrode lines has been introduced for generating THz signals.While the optical beat signal has been absorbed
by photoconductive substrate and an HTS center strip, the THz signal is gradually bulit up on the HTS coplanar
waveguide (CPW). The kinetic inductive photoresponse of the HTS strip contributes excessively in the generation
of multi-THz signal while the response of the photoconductor substrate decreases with increasing THz frequency.
A rigorous optical analysis of a multilayer waveguide in conjunction of optical-to-THz signal conversion analysis
have been carried out to find the external conversion effciency of such a photodetector. Our simulation shows
that the GaAs-based structure with YBCO electrode at1.5 μm exhibits more output THz power than its Si
counterpart in 850 nm wavelength.