A new scheme of static surface plasmon polaritons(SPPs) interferometer of the terahertz (THz) range is described. The interference pattern is formed due to interaction of two converging SPP beams that have run different distances. The original SPP beam is splitted and reflected by a flat beam splitter and a mirror disposed of the waveguiding surface and normally to it. By varying the distance spacing the splitter and the coupling element one can change the pattern period. Execution of the pattern enables one to determine both the real and imaginary part of the SPPs refractive index, which is uniquely related to the dielectric constant of the surface and the optical characteristics of its transition layer. The operating time of the interferometer is determined by the photodetector time constant, which is extremely important for studying fast processes on a conducting surface. The interferometer can work with broadband THz radiation sources (such as synchrotrons or pulsed lasers) as well.

Authors

Publisher

INST MECHANICS CONTINUA & MATHEMATICAL SCIENCES

Language

English

Pages

642-650

Status

Published

Year

2019

Organizations

^{1}RAS, Sci & Technol Ctr Unique Instrumentat, Moscow, Russia^{2}RUDN Univ, Peoples Friendship Univ Russia, Moscow, Russia

Keywords

surface plasmon polaritons; terahertz radiation; static interferometers; plasmon sensors; thin film spectroscopy

Date of creation

24.12.2019

Date of change

24.12.2019

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JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES.
INST MECHANICS CONTINUA & MATHEMATICAL SCIENCES.
2019.
P. 632-641

JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES.
INST MECHANICS CONTINUA & MATHEMATICAL SCIENCES.
2019.
P. 651-660