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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">nguphys</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский физический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>SIBERIAN JOURNAL OF PHYSICS</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2541-9447</issn><publisher><publisher-name>Новосибирский государственный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25205/2541-9447-2022-17-1-78-92</article-id><article-id custom-type="elpub" pub-id-type="custom">nguphys-173</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА ТВЕРДОГО ТЕЛА, ПОЛУПРОВОДНИКОВ, НАНОСТРУКТУР</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SOLID-STATE AND SEMICONDUCTOR PHYSICS, PHYSICS OF NANOSTRUCTURES</subject></subj-group></article-categories><title-group><article-title>Разработка узкополосного фильтра для реализации метода андерсемплинга в импульсных терагерцовых спектрометрах</article-title><trans-title-group xml:lang="en"><trans-title>Design of a Narrowband Filter for Implementing the Undersamping Method in Terahertz Time-Domain Spectrometers</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3586-9526</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рыбак</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Rybak</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Алина Анатольевна Рыбак, аспирант 4-го курса НГУWoS Researcher ID AAR-1373-2020Scopus Author ID 57216637852 </p><p>Новосибирск </p></bio><bio xml:lang="en"><p>  Alina A. Rybak, Post-Graduate StudentWoS Researcher ID AAR-1373-2020Scopus Author ID 57216637852 </p><p>Novosibirsk </p></bio><email xlink:type="simple">a.rybak1@g.nsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1627-8125</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кузнецов</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuznetsov</surname><given-names>S. А.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Сергей Александрович КузнецовWoS Researcher ID A-6723-2014Scopus Author ID 56426776500 </p><p>Новосибирск </p></bio><bio xml:lang="en"><p>  Sergei A. KuznetsovWoS Researcher ID A-6723-2014Scopus Author ID 56426776500 </p><p>Novosibirsk </p></bio><email xlink:type="simple">serge_smith@ngs.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8074-9737</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аржанников</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Arzhannikov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Андрей Васильевич Аржанников, доктор физико-математических наукWoS ResearcherID C-2443-2019Scopus Author ID 7004910972 </p><p> Новосибирск </p></bio><bio xml:lang="en"><p>  Andrey V. Arzhannikov, Doctor of Sciences (Physics and Mathematics)WoS ResearcherID C-2443-2019Scopus Author ID 7004910972 </p><p>Novosibirsk </p></bio><email xlink:type="simple">arzhan1@ngs.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7106-3100</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Николаев</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nikolaev</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p> Назар Александрович Николаев, кандидат технических наукWoS Researcher ID AAH-1279-2019Scopus Author ID 56363884600 </p><p> Новосибирск </p></bio><bio xml:lang="en"><p> Nazar A. Nikolaev, Candidate of Science (Technology)WoS Researcher ID AAH-1279-2019Scopus Author ID 56363884600  </p><p>Novosibirsk </p></bio><email xlink:type="simple">nazar@iae.nsk.su</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Новосибирский государственный университет; Институт автоматики и электрометрии Сибирского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Novosibirsk State University; Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Новосибирский государственный университет; Институт автоматики и электрометрии Сибирского отделения Российской академии наук; Новосибирский филиал Института физики полупроводников им. А. В. Ржанова Сибирского отделения Российской академии наук «КТИПМ»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Novosibirsk State University; Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences; Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Новосибирский государственный университет; Институт автоматики и электрометрии Сибирского отделения Российской академии наук; Институт ядерной физики им. Г. И. Будкера Сибирского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Novosibirsk State University; Institute of Automation and Electrometry of the Siberian Branch of the Russian Academy of Sciences;  Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>15</day><month>04</month><year>2022</year></pub-date><volume>17</volume><issue>1</issue><fpage>78</fpage><lpage>92</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Рыбак А.А., Кузнецов С.А., Аржанников А.В., Николаев Н.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Рыбак А.А., Кузнецов С.А., Аржанников А.В., Николаев Н.А.</copyright-holder><copyright-holder xml:lang="en">Rybak A.A., Kuznetsov S.А., Arzhannikov A.V., Nikolaev N.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://nguphys.elpub.ru/jour/article/view/173">https://nguphys.elpub.ru/jour/article/view/173</self-uri><abstract><p>Рассмотрен подход к созданию узкополосного квазиоптического фильтра с центральной частотой ν = 806 ГГц (λ = 372 мкм), предназначенного для реализации метода андерсемплинга в импульсной терагерцовой спектроскопии. Частота выбрана с целью мониторинга линии поглощения молекулярного газа СО в локальном окне прозрачности атмосферы. Фильтр основан на эталоне Фабри – Перо и представляет собой полипропиленовую пленку с нанесенными с обеих сторон частотно-избирательными поверхностями (ЧИП) в форме квадратных прорезей в напыленном алюминиевом слое. Посредством численного моделирования пропускания предложенной структуры определено, что оптимум отношения ширины металлической перемычки a к латеральному периоду g ЧИП лежит в окрестности a/g = 0,5. При выборе g менее половины рабочей длины волны λ показано, что полная ширина на полувысоте пропускания получаемого квазиоптического фильтра составляет менее 4 %, что достаточно для реализации метода андерсемплинга в импульсных терагерцовых спектрометрах.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we propose a design of a narrow-band quasi-optical filter with a central frequency ν = 806 GHz (λ = 372 μm) suitable for the implementation of the undersampling technique in terahertz time-domain spectroscopy. The frequency was chosen to monitor the absorption line of the molecular gas CO in the local transparency window of the atmosphere. The filter is designed as the Fabry-Perot etalon based on a polypropylene film with frequencyselective surfaces (FFS) on both sides consisting of square slots in a sprayed aluminum layer. Through numerical simulation of the transmission of the proposed structure, we defined that the optimum ratio of the width of the metal bridge a to the pitch g of the FSS lies in the vicinity of a/g = 0.5. For g less than half of the operating wavelength λ, the FWHM of the filter is less than 4%, which is sufficient for the implementation of the undersampling method in terahertz time-domain spectroscopy.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>импульсная терагерцовая спектроскопия</kwd><kwd>частотно-избирательные поверхности</kwd><kwd>квазиоптические фильтры</kwd><kwd>андерсемплинг</kwd></kwd-group><kwd-group xml:lang="en"><kwd>terahertz time-domain spectroscopy</kwd><kwd>frequency-selective surfaces</kwd><kwd>quasi-optical filters</kwd><kwd>undersampling</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 20-32-90137.</funding-statement><funding-statement xml:lang="en">The reported study was funded by RFBR according to the research project № 20-32-90137</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Анцыгин В. 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