Affiliation:
1. Prokhorov General Physics Institute of the Russian Academy of Sciences
2. Moscow Institute of Physics and Technology
3. MIREA—Russian Technological University (RTU MIREA)
4. Bauman Moscow State Technical University
5. Tohoku University
Abstract
We propose the design of a photoconductive antenna (PCA) emitter with a plasmonic grating featuring a very high plasmonic Au electrode with a thickness of 170 nm. As we show numerically, the increase in h significantly changes the electric field distribution, owing to the excitation of higher-order plasmon guided modes in the Au slit waveguides, leading to an additional increase in the emitted THz power. We develop the plasmonic grating geometry with respect to maximal transmission of the incident optical light, so as to expect the excitation of higher-order plasmon guided Au modes. The fabricated PCA can efficiently work with low-power laser excitation, demonstrating an overall THz power of 5.3 μW over an ∼4.0 THz bandwidth, corresponding to a conversion efficiency of 0.2%. We believe that our design can be used to meet the demands of modern THz spectroscopic and high-speed imaging applications.
Funder
Ministry of Education and Science of the Russian Federation
Research Institute of Electrical Communication, Tohoku University
Russian Science Foundation
Subject
Atomic and Molecular Physics, and Optics
Cited by
6 articles.
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