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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">ntv</journal-id><journal-title-group><journal-title xml:lang="ru">Научно-технический вестник информационных технологий, механики и оптики</journal-title><trans-title-group xml:lang="en"><trans-title>Scientific and Technical Journal of Information Technologies, Mechanics and Optics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-1494</issn><issn pub-type="epub">2500-0373</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2226-1494-2025-25-2-222-228</article-id><article-id custom-type="elpub" pub-id-type="custom">ntv-441</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>ОПТИЧЕСКИЕ СИСТЕМЫ И ТЕХНОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>OPTICAL ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Повышение чувствительности рефрактивного волоконно-оптического датчика на основе поверхностного плазмонного резонанса и MMF-SMF-MMF структуры с помощью диэлектрических покрытий</article-title><trans-title-group xml:lang="en"><trans-title>Increasing the sensitivity of a refractive fiber-optic sensor based on surface plasmon resonance and MMF-SMF-MMF fiber using dielectric coatings</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8021-0678</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зыкина</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zykina</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зыкина Аделия Алексеевна — инженер, Университет ИТМО.</p><p>Санкт-Петербург, 197101, sc 58527719900</p></bio><bio xml:lang="en"><p>Adeliia A. Zykina — Engineer, ITMO University.</p><p>Saint Petersburg, 197101, sc 58527719900</p></bio><email xlink:type="simple">adeliya.zykina@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5764-0960</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Плясцов</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Plyastsov</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Плясцов Семён Алексеевич — кандидат технических наук, заведующий лабораторией, ассистент, Университет ИТМО.</p><p>Санкт-Петербург, 197101, sc 57195587476</p></bio><bio xml:lang="en"><p>Semyon A. Plyastsov — PhD, Head of Laboratory, Assistant, ITMO University.</p><p>Saint Petersburg, 197101, sc 57195587476</p></bio><email xlink:type="simple">s.plyastsov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6389-1611</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гладских</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gladskikh</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гладских Игорь Аркадьевич — кандидат физико-математических наук, старший научный сотрудник, Университет ИТМО.</p><p>Санкт-Петербург, 197101, sc 56020051200</p></bio><bio xml:lang="en"><p>Igor A. Gladskikh — PhD (Physics &amp; Mathematics), Senior Researcher, ITMO University.</p><p>Saint Petersburg, 197101, sc 56020051200</p></bio><email xlink:type="simple">138020@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет ИТМО</institution><country>Россия</country></aff><aff xml:lang="en"><institution>ITMO University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>24</day><month>04</month><year>2025</year></pub-date><volume>25</volume><issue>2</issue><fpage>222</fpage><lpage>228</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Зыкина А.А., Плясцов С.А., Гладских И.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Зыкина А.А., Плясцов С.А., Гладских И.А.</copyright-holder><copyright-holder xml:lang="en">Zykina A.A., Plyastsov S.A., Gladskikh I.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://ntv.elpub.ru/jour/article/view/441">https://ntv.elpub.ru/jour/article/view/441</self-uri><abstract><sec><title>Введение</title><p>Введение. Представлены теоретические и экспериментальные исследования возможности повышения чувствительности рефрактивного волоконно-оптического датчика, принцип работы которого основан на эффекте поверхностного плазмонного резонанса. Конструкция чувствительного элемента состоит из последовательного соединения многомодового (MMF), одномодового (SMF) и многомодового волокна со структурой MMF-SMFMMF. Для создания эффекта поверхностного плазмонного резонанса на одномодовый участок наносятся последовательно покрытия из металла (меди (Cu)) и диэлектрика (оксида алюминия (Al2O3), диоксида титана (TiO2)), что позволяет получить более узкие резонансные пики. В результате упрощается процесс детектирования изменения длины волны и повышается чувствительность датчика.</p></sec><sec><title>Метод</title><p>Метод. Математическое моделирование чувствительного элемента с многослойной поверхностной структурой выполнено с применением характеристических матриц. Матрицы составляются для каждого слоя чувствительного элемента в отдельности, после чего формируется характеристическая матрица всей структуры и рассчитывается коэффициент пропускания. По результатам моделирования выбираются варианты диэлектрического покрытия, определяются толщины слоев, позволяющие получить наименьшую ширину резонансного пика. Основные результаты. Для апробации результатов моделирования изготовлены образцы чувствительных элементов c диэлектрическим покрытием Al2O3 толщиной 60 и 100 нм и с покрытием TiO2 толщиной 50 и 100 нм. Получены спектры пропускания чувствительных элементов на воздухе, в воде и спирте. Показано, что покрытие TiO2 толщиной 50 нм позволяет повысить чувствительность волоконно-оптического датчика на основе поверхностного плазмонного резонанса в три раза по сравнению с чувствительным элементом без диэлектрического покрытия.</p></sec><sec><title>Обсуждение</title><p>Обсуждение. Предложенный подход к усовершенствованию конструкции волоконно-оптического датчика дает возможность сместить получаемые резонансные максимумы в инфракрасную область спектра. Показана возможность применения более доступных волоконно-оптических элементов для работы с исследуемым датчиком.</p></sec></abstract><trans-abstract xml:lang="en"><p>This paper presents theoretical and experimental research on improving the sensitivity of a refractive fiber-optic sensor operating on the principle of surface plasmon resonance (SPR). The sensitive element consists of a multimodesinglemode-multimode (MMF-SMF-MMF) fiber structure. To induce the SPR effect, the single-mode fiber section is sequentially coated with metal (Cu) and dielectric layers (Al2O3, TiO2), which results in narrower resonance peaks. This enhances wavelength shift detection and increases sensor sensitivity. Mathematical modeling of the sensitive element with a multilayer surface structure was conducted using characteristic matrices. Each layer of the sensitive element was individually characterized, followed by the formulation of the overall characteristic matrix to calculate the transmission coefficient. Based on the simulation results, optimal dielectric coatings and layer thicknesses were selected to achieve the narrowest resonance peak. To validate the simulation findings, sensitive element samples with dielectric coatings of Al2O3 (60 nm and 100 nm) and TiO2 (50 nm and 100 nm) were fabricated. Transmission spectra were obtained in air, water, and ethanol. The results demonstrate that the proposed coating increases the sensitivity of the fiber-optic SPR sensor threefold compared to an uncoated sensitive element. The proposed approach not only enhances sensor sensitivity but also shifts the resonance peaks into the infrared spectral region. Additionally, the study highlights the feasibility of using more accessible fiber-optic components for the investigated sensor system.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>поверхностный плазмонный резонанс</kwd><kwd>гетеросердцевинная структура</kwd><kwd>оптоволоконный датчик</kwd><kwd>повышение чувствительности волоконно-оптических датчиков</kwd><kwd>многослойные покрытия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>surface plasmon resonance</kwd><kwd>heterocore structure</kwd><kwd>fiber-optic sensor</kwd><kwd>increasing the sensitivity of fiber-optic sensors</kwd><kwd>multilayer coatings</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Yadav P.K., Srivastava R., Chaurasiya N. Optical fiber sensor: review and applications // International Journal of Creative Research Thoughts. 2018. V. 6. N 1. 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