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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">10.17586/2226-1494-2024-24-6-892-898</article-id><article-id custom-type="elpub" pub-id-type="custom">ntv-394</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>Оптимизация геометрии двумерного фотоннокристаллического волновода для телекоммуникационных применений и сенсорики</article-title><trans-title-group xml:lang="en"><trans-title>Optimization of geometry of two-dimensional photonic crystal waveguide for telecommunications and sensorics</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0008-0353-643X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Еланская</surname><given-names>К. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Elanskaia</surname><given-names>K. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Еланская Кристина Геннадьевна - аспирант, </p><p>Санкт-Петербург, 197022</p></bio><bio xml:lang="en"><p>Kristina G. Elanskai - PhD Student,</p><p>Saint Petersburg, 197022,</p></bio><email xlink:type="simple">k@xarsis.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/0000-0001-8730-4389</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сидоров</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidorov</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сидоров Александр Иванович - доктор физико-математических наук, доцент, ведущий научный сотрудник, Университет ИТМО, Санкт-Петербург, 197101;</p><p>профессор, Санкт-Петербург, 197022</p></bio><bio xml:lang="en"><p>Alexander I. Sidorov - D.Sc. (Physics &amp; Mathematics), Associate Professor, Leading Researcher, Saint Petersburg, 197101;</p><p>Professor, Saint Petersburg, 197022, Russian Federation</p></bio><email xlink:type="simple">ai.sido@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный электротехнический университет «ЛЭТИ» им. В.И. Ульянова (Ленина)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint Petersburg Electrotechnical Universuty “LETI”, Saint Petersburg, 197022</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Университет ИТМО;&#13;
Санкт-Петербургский государственный электротехнический университет «ЛЭТИ» им. В.И. Ульянова (Ленина)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>ITMO University;&#13;
Saint Petersburg Electrotechnical Universuty “LETI”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>27</day><month>12</month><year>2024</year></pub-date><volume>24</volume><issue>6</issue><fpage>892</fpage><lpage>898</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Еланская К.Г., Сидоров А.И., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Еланская К.Г., Сидоров А.И.</copyright-holder><copyright-holder xml:lang="en">Elanskaia K.G., Sidorov A.I.</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/394">https://ntv.elpub.ru/jour/article/view/394</self-uri><abstract><sec><title>Введение</title><p>Введение. Представлены результаты оптимизации геометрии двумерного фотонно-кристаллического волновода с целью минимизации оптических потерь и стабилизации волноводных мод. Без учета поглощения основным фактором, приводящим к уменьшению пропускания фотоннокристаллического волновода, является возникновение брэгговского отражения. Брэгговское отражение может быть снижено путем уменьшения областей перекрытия участков фотонного кристалла с высоким показателем преломления и волноводом на границе фотонный кристалл–волновод. Для этого отверстия в фотонном кристалле на границе с волноводом могут быть изготовлены не целыми, а в виде половин отверстий. Для стабилизации волноводных мод выполнено изменение ширины волновода.</p></sec><sec><title>Метод</title><p>Метод. Оптимизация проводилась путем численного моделирования с использованием метода конечных разностей во временной области в среде Comsol Multiphisics 5.5. Энергетическая зонная структура фотонного кристалла, окружающего волновод, вычислялась методом блоховских функций. При моделировании применена свободная треугольная сетка с качеством «extremely fine». Проведено исследование в области длин при частоте собственных значений равной 190–200 ТГц. Длая решения поставленных задач использовались процедуры ARPACK FORTRAN, которые работают на основе итерации Арнольди.</p></sec><sec><title>Основные результаты</title><p>Основные результаты. Показано, что изменение геометрии фотонно-кристаллического волновода на границе фотонный кристалл–волновод позволяет уменьшить модуляцию эффективного показателя преломления и за счет этого снизить брэгговское отражение от волновода. Расчеты показали, что примененная геометрическая оптимизация фотонно-кристаллического волновода позволяет уменьшить брэгговское отражение в 1,75 раз. Установлено, что потери фотонно-кристаллического волновода, в данном случае, не превышают 0,4 дБ/см. Показано, что уменьшение диаметра отверстий в фотонном кристалле при постоянном периоде фотонно-кристаллической решетки приводит к уменьшению ширины фотонной запрещенной зоны. Установлено, что в волноводе оптимальной ширины модуляция волноводной моды сохраняется, но ее амплитуда значительно уменьшается.</p></sec><sec><title>Обсуждение</title><p>Обсуждение. Полученные результаты могут быть использованы при разработке интегрально-оптических устройств для телекоммуникаций и сенсорики с малыми оптическими потерями.</p></sec></abstract><trans-abstract xml:lang="en"><p>The results of geometry optimization of the two-dimensional photonic crystal waveguide for minimization of optical losses and stabilization of waveguide modes are presented. The main factor (not including absorption) is the appearance of Bragg reflection. Bragg reflection can be decreased by the decrease of the regions of overlaps with high refractive index in photonic crystal. For this purpose, the holes in photonic crystal can be fabricated not as the whole holes but as the parts of the holes. For waveguide modes stabilization the varying of waveguide width was performed. Computer simulation was performed in Comsol Multiphisics 5.5. Energy zone structure of photonic crystal surrounding waveguide was computed by Bloch functions method. In modeling, the free-triangle grid with quality “extremely fine” was used. The frequency near which eigenvalues were looked for has range of 190–200 THz. For the solving of the problems procedures ARPACK FORTRAN were used which work on base of iteration of Arnoldi (IRAM). Modeling have shown that the used geometrical optimization makes possible to decrease the Bragg reflection by 1.75 times. It was established that the losses of photon crystal waveguide in this case do not exceed 0.4 dB/cm. It was shown that the the decrease in the photonic crystal holes diameter with a constant period of the photonic crystal lattice leads to a decrease in the width of the photonic forbidden bandgap. It was shown also that in the waveguide with optimum width the modulation of waveguide mode is maintained but its amplitude decreases significantly. The obtained results can be used in the development of integrated-optical devices for telecommunications and sensorics with low optical losses.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фотонный кристалл</kwd><kwd>волновод</kwd><kwd>фотонная запрещенная зона</kwd><kwd>телекоммуникации</kwd><kwd>сенсорика</kwd></kwd-group><kwd-group xml:lang="en"><kwd>photonic crystal</kwd><kwd>waveguide</kwd><kwd>photonic bandgap</kwd><kwd>telecommunications</kwd><kwd>sensorics</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке программой «Приоритет 2030».</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">Joannopoulos J.D., Meade R.D., Winn J.N. Photonic Crystals: Molding the Flow of Light. 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