On optimal conditions for generation of terahertz surface plasmon-polaritons by the end-fire coupling technique

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Abstract

The results of an experimental study of the generation of surface plasmon-polaritons in the terahertz range are presented. The end-fire coupling technique has been used for generation, when the beam is focused on the metal–dielectric interface. It has been found that at normal beam incidence, the efficiency of plasmon-polaritons generation is maximum, and the half-width of the dependence of the generation efficiency on the angle of radiation incidence in the sample plane is 6.0° ± 0.5°. It is shown that the generation efficiency has a maximum at a certain shift of the center of the incident beam relative to the metal–dielectric interface. The half-width of this maximum is 590 ± 50 μm, which is consistent with theory within the error limits.

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About the authors

P. А. Nikitin

Scientific and Technological Centre of Unique Instrumentation RAS

Author for correspondence.
Email: nikitin.pavel.a@gmail.com
Russian Federation, Moscow

V. V. Gerasimov

Novosibirsk State University; Budker Institute of Nuclear Physics SB RAS

Email: v.v.gerasimov3@gmail.com
Russian Federation, Novosibirsk; Novosibirsk

A. G. Lemzyakov

Budker Institute of Nuclear Physics SB RAS; Shared Research Center “Siberian Ring Photon Source”, Boreskov Institute of Catalysis SB RAS

Email: nikitin.pavel.a@gmail.com
Russian Federation, Novosibirsk; Novosibirsk

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Supplementary files

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2. Fig. 1. Scheme of generation of plasmon-polaritons by the edge diffraction method: a – side view; b – top view.

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3. Fig. 2. Theoretical dependence of the efficiency of generation of plasmon-polaritons in the THz range on the position of the central part of the incident radiation beam.

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4. Fig. 3. Schematic diagram of the experimental setup: 1 — THz radiation beam; 2 — flat mirror; 3 — cylindrical mirror; 4 — sample; 5 — screen; 6 — radiation receiver.

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5. Fig. 4. Experimental dependence of the efficiency of generation of plasmon-polaritons in the THz range on the position of the central part of the incident radiation beam.

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6. Fig. 5. Experimental dependence of the efficiency of generation of plasmon-polaritons in the THz range on the angle of incidence of the radiation beam.

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