Use of Self-assembled Plasmonic Hole Arrays on AlGaAs/GaAs 2DEG for Large Area Terahertz Applicaton

TL;DR

This paper demonstrates large-area, high-sensitivity terahertz plasmonic detectors using self-assembled nanosphere lithography on AlGaAs/GaAs 2DEG, enabling rapid fabrication of tunable, polarization-independent devices.

Contribution

It introduces a novel, rapid fabrication method for large-area terahertz plasmonic detectors using self-assembly nanosphere lithography, overcoming limitations of previous small, polarization-dependent devices.

Findings

Achieved 25% transmission change at 80 K

Demonstrated blue shift with decreasing aperture size

Confirmed magneto plasmon dispersion

Abstract

Plasmonic detectors have the potential to provide a method of rapid spectroscopy without the need of moving mirrors or gratings. Previous measurements have demonstrated frequency tunable detection based on plasmonic excitations, however these devices were either small area, polarization dependent and/or required e-beam lithography. We demonstrate that large area high sensitivity THz plasmonic detection can be achieved using self-assembly nanosphere lithography. We achieve a submicron feature size grid covering a detector area of 4 mm^2. Measurements at 80 K show a large transmission change of 25% and a blue shift with decreasing aperture size due to coupling of disk lattice. The resonant frequencies of our device are function of radius, not periodicity. We also confirmed a magneto plasmon dispersion of the device. In conclusion we find that fabrication of self-assembled grids is a rapid and reliable method for plasmonic devices in the terahertz range.