Friday, June 2, 2017

Abstract-Plasmonic Anti-reflection Coating for Photoconductive Terahertz Generation

Faezeh FesharakiAfshin JoosheshVahid Bahrami-YektaMahsa MahtabTom TiedjeThomas E. Darcie, and Reuven Gordon

Plasmon-enhanced photoconductive antennas allow for improved performance, particularly in below-bandgap absorption devices using low-temperature grown GaAs. Here we design the plasmonic nanostructures to act as anti-reflection coatings as well, achieving below 10% reflection at 1570 nm wavelength in an optimized device. Quantitative agreement is seen between experiment and theory. Terahertz emission field amplitudes demonstrate eighteen times enhancement compared to that of a conventional terahertz photoconductive antenna on the same substrate.

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