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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">8543</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Interference Refractometry of Terahertz Surface Plasmon-Polaritons Launched by a Free-Electron Laser</article-title><trans-title-group xml:lang="ru"><trans-title>Интерференционная рефрактометрия терагерцовых поверхностных плазмон-поляритонов, генерированных лазером на свободных электронах</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gerasimov</surname><given-names>V V</given-names></name><name xml:lang="ru"><surname>Герасимов</surname><given-names>Василий Валерьевич</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Knyazev</surname><given-names>B A</given-names></name><name xml:lang="ru"><surname>Князев</surname><given-names>Борис Александрович</given-names></name></name-alternatives><email>knyazev@phys.nsu.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikitin</surname><given-names>A K</given-names></name><name xml:lang="ru"><surname>Никитин</surname><given-names>Алексей Константинович</given-names></name></name-alternatives><email>alnikitin@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikitin</surname><given-names>V V</given-names></name><name xml:lang="ru"><surname>Никитин</surname><given-names>В В</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rijova</surname><given-names>T A</given-names></name><name xml:lang="ru"><surname>Рыжова</surname><given-names>Татьяна Александровна</given-names></name></name-alternatives><bio xml:lang="en">General Physics Department</bio><bio xml:lang="ru">Кафедра общей физики</bio><email>-</email><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Budker Institute of Nuclear Physics SB RAS</institution></aff><aff><institution xml:lang="ru">Институт ядерной физики им. Г. И. Будкера СО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Novosibirsk State University</institution></aff><aff><institution xml:lang="ru">Новосибирский государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Scientific and Technological Center for Unique Instrumentation of RAS</institution></aff><aff><institution xml:lang="ru">Научно-технологический центр уникального приборостроения РАН</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">People’s Friendship University of Russia</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2013-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2013</year></pub-date><issue>2</issue><issue-title xml:lang="en">NO2 (2013)</issue-title><issue-title xml:lang="ru">№2 (2013)</issue-title><fpage>191</fpage><lpage>200</lpage><history><date date-type="received" iso-8601-date="2016-09-08"><day>08</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2013, Герасимов В.В., Князев Б.А., Никитин А.К., Никитин В.В., Рыжова Т.А.</copyright-statement><copyright-year>2013</copyright-year><copyright-holder xml:lang="ru">Герасимов В.В., Князев Б.А., Никитин А.К., Никитин В.В., Рыжова Т.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/8543">https://journals.rudn.ru/miph/article/view/8543</self-uri><abstract xml:lang="en">The problem of terahertz (THz) surface plasmon-polaritons (SPP) refractometry, i.e. determination of their complex refractive index κ = κ′ + i ⋅ κ′′ employing interferometric measurements, is considered in the paper. It is stated that one can determine both parts of κ provided the interference pattern formed by a reference bulk wave and the wave produced by the SPP is recorded. The idea was tested for SPP generated by monochromatic radiation (wavelength 140 μm) of Novosibirsk THz free-electron laser on gold samples covered with diﬀerent thickness ZnS layers. Besides, intensity distribution of the SPP ﬁeld in air over the track has been registered instantly with an uncooled vanadium oxide microbolometer focal plane array consisting of 320×240 sensitive elements. The results obtained are in good agreement with the theory provided the covering layer thickness is equal or exceeds 2 μm.</abstract><trans-abstract xml:lang="ru">В статье рассмотрена проблема интерференционной рефрактометрии монохроматических терагерцовых (ТГц) поверхностных плазмон-поляритонов (ППП), т.е. задача определения их комплексного показателя преломления κ = κ′ + i ⋅ κ′′. Показано, что интерференционная картина, полученная в результате взаимодействия опорного пучка объёмного излучения и объёмной волны, порождаемой ППП, содержит информацию об обеих частях κ. Метод апробирован для ППП, генерируемых излучением Новосибирского лазера на свободных электронах (длина волны 140 мкм) на поверхности золотых образцов с ZnS покрытием различной толщины. Кроме того, с помощью неохлаждаемой матрицы (320 × 240 пикселей) микроболометров на основе окиси ванадия получены изображения распределения интенсивности поля в воздухе над треком ППП. Результаты измерений хорошо согласуются с расчётными для покровного слоя толщиной 2 мкм и более.</trans-abstract><kwd-group xml:lang="en"><kwd>terahertz radiation</kwd><kwd>surface plasmon-polaritons</kwd><kwd>refractometry</kwd><kwd>surface electromagnetic waves</kwd><kwd>free-electron laser</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рефрактометрия монохроматических терагерцовых поверхностных плазмон-поляритонов</kwd><kwd>поверхностные электромагнитные волны</kwd><kwd>лазер на свободных электронах</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Maier S.A. Plasmonics: Fundamentals and Applications. — Springer, 2007. — 223 p.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Surface Polaritons. Surface Electromagnetic Waves at Surfaces and Interfaces / Ed. by V.M. Agranovich, D.L. 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