vestifmИзвестия Национальной академии наук Беларуси. Серия физико-математических наукProceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series1561-24302524-2415The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-2430-2022-58-2-221-230vestifm-645Research ArticleФИЗИКАPHYSICSПоглощение неполяризованного света двумерным ансамблем сферических частиц серебра при наклонном освещенииAbsorption of nonpolarized light by a two-dimensional ensemble of spherical silver particles under oblique illuminationЛойкоВ. А.LoikoV. A.

Лойко Валерий Александрович – доктор физико-математических наук, профессор, главный научный сотрудник Центра «Оптическое дистанционное зондирование»

пр. Независимости, 68-2, 220072, Минск

Valery A. Loiko – Dr. Sc. (Physics and Mathematics), Professor, Chief Researcher the Center for Optical Remote Sensing

68-2, Niezalezhnastsi Ave., 220072, Minsk

loiko@ifanbel.bas-net.byМискевичА. А.MiskevichA. A.

Мискевич Александр Амуратович – кандидат физико-математических наук, ведущий научный сотрудник Центра «Оптическое дистанционное зондирование»

пр. Независимости, 68-2, 220072, Минск

Alexander A. Miskevich – Ph. D. (Physics and Mathematics), Leading Researcher of the Center for Optical Remote Sensing

68-2, Niezalezhnastsi Ave., 220072, Minsk

miskevic@ifanbel.bas-net.byИнститут физики имени Б. И. Степанова Национальной академии наук БеларусиB. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus202205072022582221230Copyright © Лойко В.А., Мискевич А.А., 20222022Лойко В.А., Мискевич А.А.Loiko V.A., Miskevich A.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestifm.belnauka.by/jour/article/view/645

Рассмотрена проблема поглощения неполяризованного (естественного) света двумерным ансамблем (монослоем) сферических частиц при наклонном освещении. Для ее решения использована статистическая теория многократного рассеяния волн. Записанные уравнения позволяют находить оптимальные условия поглощения направленного излучения для увеличения эффективности поглощения монослоев c периодическим и частично упорядоченным пространственным расположением частиц. Приведены результаты расчетов коэффициента поглощения поляризованного и естественного излучения ансамблями частиц серебра в непоглощающей среде. Размер частиц и фактор заполнения монослоя выбраны так, чтобы проиллюстрировать зависимость поглощения от угла падения в условиях проявления резонансных эффектов, обусловленных пространственной организацией частиц. Показано, что в области резонансного пика поглощения при освещении по нормали монослой с треугольной решеткой из частиц серебра может поглощать почти на порядок больше падающего излучения, чем частично упорядоченный слой. Коэффициент поглощения монослоя при направленном наклонном освещении может быть почти на порядок больше, чем при освещении по нормали. Результаты могут быть использованы для оптимизации конструкций оптоэлектронных устройств на основе монослоев частиц.

The problem of absorption of nonpolarized (natural) light by a two-dimensional ensemble (monolayer) of spherical particles under oblique illumination is considered. The solution is based on the statistical theory of multiple scatteing of waves. The written equations make it possible to find the optimal conditions for the absorption of directed light to increase the absorption efficiency of monolayers with a periodic and partially ordered spatial arrangement of particles. The results of the calculations are presented for the absorption coefficient of polarized and natural light by ensembles of silver particles in a nonabsorbing medium. The particle size and monolayer filling factor are chosen so as to illustrate the dependence of absorption on the angle of incidence under conditions of resonance effects caused by the spatial organization of particles. It is shown that in the region of the resonant absorption peak a normally illuminated monolayer with a triangular lattice of silver particles can absorb almost an order of magnitude more incident light than a partially ordered layer. The absorption coefficient of a monolayer under directional oblique illumination can be almost an order of magnitude larger than under normal illumination. The results can be used to optimize the design of opto-electronic devices based on particulate layers.

поглощение светаполяризация светапространственно организованные нано- и микроструктурыметаповерхностиlight absorptionpolarization of lightspatially organized nano- and microstructuresmetasurfacesРабота выполнена при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований (проект № Ф20КИ-004). Авторы выражают благодарность профессору Н. А. Лойко за плодотворные дискуссии.This work was performed with the financial support of the Belarusian Republican Foundation for Fundamental Research (Grant № Ф20КИ-004). The authors are grateful to Professor N. A. Loiko for fruitful discussions.ReferencesVecchi, G. Surface modes in plasmonic crystals induced by diffractive coupling of nanoantennas / G. Vecchi, V. Giannini, J. G. Rivas // Phys. Rev. B. – 2009. – Vol. 80, № 20. – P. 201401-4. https://doi.org/10.1103/PhysRevB.80.201401Vecchi G., Giannini V., Rivas J. G. Surface modes in plasmonic crystals induced by diffractive coupling of nanoantennas. 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The authors declare that there are no conflicts of interest present.