In-plane interferometry of terahertz surface plasmon polaritons

A. K. Nikitin, O. V. Khitrov, V. V. Gerasimov, I. Sh Khasanov, T. A. Ryzhova

Research output: Contribution to journalConference articlepeer-review

Abstract

The paper is devoted to the development of interferometric schemes for determining the complex refractive index κ = κ′+i•κ″ κ of surface plasmon-polaritons (SPPs) of the terahertz (THz) spectral range. As the value of κ depends on the dielectric constant ϵm of the metal surface guiding the SPPs it can be used for determining m in the far infrared what other optical methods fail to do due to high reflectivity of metals. We discuss two types of THz SPP interferometers in which the interference pattern is formed as a result of the interaction of SPP beams themselves rather than bulk waves produced by these beams. The first type of interferometers are static devices that enable one to investigate fast processes on the metal surface, while the second type are dynamic ones that make it possible to realize Fourier spectroscopy of the metal surface and its transition layer at THz frequencies. Devices of the both types produce interferograms enabling one to determine the real and the imaginary parts of κ. The results of experiments on the interaction of THz SPPs with flat mirrors and beam - splitting plates, the key elements of the THz SPP interferometers, are presented.

Original languageEnglish
Article number012013
JournalJournal of Physics: Conference Series
Volume1421
Issue number1
DOIs
Publication statusPublished - 30 Dec 2019
Event15th International Conference on Optical Methods of Flow Investigation, OMFI 2019 - Moscow, Russian Federation
Duration: 24 Jun 201928 Jun 2019

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