Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons
With the intensive development of data transmitting and processing devices in the terahertz (THz) frequency range, an important part of which are integrated plasmonic components and communication lines, it becomes necessary to measure correctly the optical constants of their conductive surfaces. In...
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MDPI AG
2023-07-01
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| author | Vasily Valerievich Gerasimov Alexey Konstantinovich Nikitin Alexey Georgievich Lemzyakov Ivan Aleksandrovich Azarov Igor Aleksandrovich Kotelnikov |
| author_facet | Vasily Valerievich Gerasimov Alexey Konstantinovich Nikitin Alexey Georgievich Lemzyakov Ivan Aleksandrovich Azarov Igor Aleksandrovich Kotelnikov |
| author_sort | Vasily Valerievich Gerasimov |
| collection | DOAJ |
| description | With the intensive development of data transmitting and processing devices in the terahertz (THz) frequency range, an important part of which are integrated plasmonic components and communication lines, it becomes necessary to measure correctly the optical constants of their conductive surfaces. In this paper, we describe a reliable method for determining the effective permittivity <i>ε</i><sub>m</sub> of a metal surface from the measured characteristics (refractive and absorption indices) of THz surface plasmon polaritons (SPPs). The novelty of the method is the conduction of measurements on a metal surface with a dielectric layer of subwavelength thickness, suppressing the radiative losses of SPPs, which are not taken into account by the SPP dispersion equation. The method is tested on a number of flat “gold sputtering–zinc sulfide layer–air” structures with the use of the THz radiation (<i>λ</i><sub>0</sub> = 141 μm) from the Novosibirsk free electron laser (NovoFEL). The SPP characteristics are determined from interferograms measured with a plasmon Michelson interferometer. It is found that the method allows a significant increase in the accuracy of the <i>ε</i><sub>m</sub> in comparison with measurements on the same metal surface without a dielectric layer. |
| first_indexed | 2024-03-11T01:46:36Z |
| format | Article |
| id | doaj.art-e644bb75d19d448dae204b586fb649d4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T01:46:36Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-e644bb75d19d448dae204b586fb649d42023-11-18T16:13:02ZengMDPI AGApplied Sciences2076-34172023-07-011313789810.3390/app13137898Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon PolaritonsVasily Valerievich Gerasimov0Alexey Konstantinovich Nikitin1Alexey Georgievich Lemzyakov2Ivan Aleksandrovich Azarov3Igor Aleksandrovich Kotelnikov4Department of Physics, Novosibirsk State University, 1 Pirogova Street, 630090 Novosibirsk, RussiaScientific and Technological Centre of Unique Instrumentation of the Russian Academy of Sciences, 15 Bytlerova Street, 117342 Moscow, RussiaBudker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, 11 Lavrentiev Prospect, 630090 Novosibirsk, RussiaDepartment of Physics, Novosibirsk State University, 1 Pirogova Street, 630090 Novosibirsk, RussiaBudker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, 11 Lavrentiev Prospect, 630090 Novosibirsk, RussiaWith the intensive development of data transmitting and processing devices in the terahertz (THz) frequency range, an important part of which are integrated plasmonic components and communication lines, it becomes necessary to measure correctly the optical constants of their conductive surfaces. In this paper, we describe a reliable method for determining the effective permittivity <i>ε</i><sub>m</sub> of a metal surface from the measured characteristics (refractive and absorption indices) of THz surface plasmon polaritons (SPPs). The novelty of the method is the conduction of measurements on a metal surface with a dielectric layer of subwavelength thickness, suppressing the radiative losses of SPPs, which are not taken into account by the SPP dispersion equation. The method is tested on a number of flat “gold sputtering–zinc sulfide layer–air” structures with the use of the THz radiation (<i>λ</i><sub>0</sub> = 141 μm) from the Novosibirsk free electron laser (NovoFEL). The SPP characteristics are determined from interferograms measured with a plasmon Michelson interferometer. It is found that the method allows a significant increase in the accuracy of the <i>ε</i><sub>m</sub> in comparison with measurements on the same metal surface without a dielectric layer.https://www.mdpi.com/2076-3417/13/13/7898terahertz plasmonicssurface plasmon polaritonsplasmon Michelson interferometerdielectric permittivity of metalsconducting surfacethin dielectric layers |
| spellingShingle | Vasily Valerievich Gerasimov Alexey Konstantinovich Nikitin Alexey Georgievich Lemzyakov Ivan Aleksandrovich Azarov Igor Aleksandrovich Kotelnikov Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons Applied Sciences terahertz plasmonics surface plasmon polaritons plasmon Michelson interferometer dielectric permittivity of metals conducting surface thin dielectric layers |
| title | Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons |
| title_full | Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons |
| title_fullStr | Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons |
| title_full_unstemmed | Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons |
| title_short | Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons |
| title_sort | obtaining the effective dielectric permittivity of a conducting surface in the terahertz range via the characteristics of surface plasmon polaritons |
| topic | terahertz plasmonics surface plasmon polaritons plasmon Michelson interferometer dielectric permittivity of metals conducting surface thin dielectric layers |
| url | https://www.mdpi.com/2076-3417/13/13/7898 |
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