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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">15805</article-id><article-id pub-id-type="doi">10.22363/2312-9735-2017-25-2-182-191</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Physics and Astronomy</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Физика</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">Coherent Perfect Absorption Mediated Enhancement and Optical Bistability in Phase Conjugation</article-title><trans-title-group xml:lang="ru"><trans-title>Усиление и оптическая бистабильность при фазовом сопряжении, обусловленные идеальным когерентным поглощением света</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nireekshan</surname><given-names>Reddy Kothakapu</given-names></name><name xml:lang="ru"><surname>Нирикшан</surname><given-names>Редди Котакапу</given-names></name></name-alternatives><bio xml:lang="en">School of Physics</bio><bio xml:lang="ru">Институт физики</bio><email>knireekshanreddy@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gopal</surname><given-names>Venu Achanta</given-names></name><name xml:lang="ru"><surname>Гопал</surname><given-names>Вену Эчанта</given-names></name></name-alternatives><bio xml:lang="en">Department of Condensed Matter Physics and Material Sciences</bio><bio xml:lang="ru">Отдел физики конденсированных сред и наук о материалах</bio><email>achanta@tifr.res.in</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gupta</surname><given-names>Subhasish Dutta</given-names></name><name xml:lang="ru"><surname>Гупта</surname><given-names>Субхашиш Датта</given-names></name></name-alternatives><bio xml:lang="en">School of Physics</bio><bio xml:lang="ru">Институт физики</bio><email>sdghyderabad@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">University of Hyderabad</institution></aff><aff><institution xml:lang="ru">Университет Хайдерабада</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Tata Institute of Fundamental Research</institution></aff><aff><institution xml:lang="ru">Институт фундаментальных исследований Тата</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2017-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2017</year></pub-date><volume>25</volume><issue>2</issue><issue-title xml:lang="en">VOL 25, NO2 (2017)</issue-title><issue-title xml:lang="ru">ТОМ 25, №2 (2017)</issue-title><fpage>182</fpage><lpage>191</lpage><history><date date-type="received" iso-8601-date="2017-04-14"><day>14</day><month>04</month><year>2017</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 2017, Нирикшан Р.К., Гопал В.Э., Гупта С.Д.</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Нирикшан Р.К., Гопал В.Э., Гупта С.Д.</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/15805">https://journals.rudn.ru/miph/article/view/15805</self-uri><abstract xml:lang="en">Coherent perfect absorption has been one of the important research directions in optics in recent years because of its ability to absorb all the incident light. It has been extended to nonlinear regime to show multistability and gap solitons in nonlinear periodic structures. We study yet another nonlinear effect, namely, phase conjugation in a Kerr nonlinear composite slab when the counter propagating pump waves are completely absorbed by means of coherent perfect absorption. The theory is developed under the undepleted pump approximation, when the pump waves can be decoupled from the signal and the phase conjugated waves. Dynamical phase matching is also incorporated. The coupling constant and the phase conjugated reflectivity are shown to undergo a substantial increase. They also exhibit multivalued response. Both downward and upward switching are shown to be possible. The effect can be used for efficient switching of the phase conjugated reflectivity in photonic circuits and can find several application in photonic logic gates.</abstract><trans-abstract xml:lang="ru">Идеальное когерентное поглощение света стало одним из важных направлений исследований в последние годы в области оптики из-за его способности поглощать весь падающий свет. Это явление в данной работе распространено на нелинейный режим, что позволило продемонстрировать мультистабильность и существование щелевых солитонов в таких нелинейных периодических структурах. В работе также исследуется ещё один нелинейный эффект, а именно обращение волнового фронта (ОВФ) в керровской нелинейной композитной структуре, когда распространяющиеся волны накачки полностью поглощаются с помощью когерентного идеального поглощения. Теория разработана в предположении постоянной интенсивности волны накачки, тогда последняя может быть отделена от сигнальной и фазосопряжённой волн. Учитывается также динамическое согласование фаз. Показано, что постоянная связи и величина фазосопряжённой отражательной способности в этом случае значительно увеличиваются, при этом становятся многозначными функциями. Продемонстрирована возможность переключений как «вниз», так и «вверх». Эта возможность может быть использована для эффективного переключения фазосопряжённой отражательной способности в фотонных схемах, а также найти несколько приложений при построении логических оптических вентилей.</trans-abstract><kwd-group xml:lang="en"><kwd>phase conjugation</kwd><kwd>coherent perfect absorption</kwd><kwd>switching</kwd><kwd>Kerr medium</kwd><kwd>multistability</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фазовое сопряжение</kwd><kwd>идеальное когерентное поглощение</kwd><kwd>переключение</kwd><kwd>керровская среда</kwd><kwd>мультистабильность</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Yariv A. 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