Enhanced THz radiation through a thick plasmonic electrode grating photoconductive antenna with tight photocarrier confinement

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...

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Bibliographic Details
Published in:Optics letters 2023-03, Vol.48 (5), p.1220-1223
Main Authors: Ponomarev, Dmitry S, Lavrukhin, Denis V, Glinskiy, Igor A, Yachmenev, Alexander E, Zenchenko, Nikolay V, Khabibullin, Rustam A, Goncharov, Yurii G, Otsuji, Taiichi, Zaytsev, Kirill I
Format: Article
Language:English
Subjects:
Antennas
Electric fields
Electrodes
Emitters
Excitation
Plasmonics
Waveguides
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Summary: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  W 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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.486431