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Spectral Dependence of the Naximum Near-Field Efficiency for Spherical Gold Nanoparticlesстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 ноября 2020 г.
- Авторы: Stuchbryukov S.D., Sukhov V.M.
- Журнал: Protection of Metals and Physical Chemistry of Surfaces
- Том: 56
- Номер: 2
- Год издания: 2020
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 459
- Последняя страница: 467
- DOI: 10.1134/S2070205120020252
- Аннотация: A method for constructing the spectral dependence of near-field maximum efficiency Qmaxnf on the surface of a spherical nanoparticle has been suggested. It has been shown that, for preset wavelength λ and a selected refractive index of the environment n, the dependences of near-field efficiency Qnf on particle radius a had the form of smooth curves with a maximum. Therefore, with knowledge of a sufficient number of such curves, one can find both the values of Qmaxnf(λ, n) and corresponding radii of the particles a (Qmaxnf(λ, n)). The suggested approach has been used to construct spectral dependences Qmaxnf(λ) for gold nanoparticles in a homogeneous isotropic nonabsorbing medium (in the range of λ from 200 to 1950 nm). Air (n = 1.0), water (n = 1.33), and a model organic compound with n = 1.5 have been selected as typical media. It has been demonstrated that, from a practical point of view, the sections of curves Qmaxnf(λ) from ≅ 480 to 1950 nm are of particular interest. Within this range of wavelengths, the dependences of Qmaxnf on λ represent asymmetric resonant-type curves. Absolute values of Qmaxnf(λ), the positions of their maxima, and the half-widths of all the curves have been found. It has been shown that, with the increase of n, the positions of a maximum and a half-width of each curve have changed insignificantly, while the extreme values of Qmaxnf themselves have increased substantially. Regular patterns of the behavior of functions a (Qmaxnf(λ, n)) have been determined. In order to illustrate the possibilities of the developed approach, two physical phenomena based on the use of near-field electromagnetic fields of high intensity have been discussed. It has been demonstrated that, in both cases, there was a satisfactory agreement between the values of a(Qmaxnf(λ, n)) calculated by us and the experimentally determined values found in published works for the radii of gold spherical nanoparticles at which the observed action of the near-field was manifested to the maximum extent. Prospects for application of the suggested approach to study the spectral behavior of the maximum efficiency of extinction, scattering, and absorption efficiency of spherical nanoparticles have been discussed.
- Добавил в систему: Сухов Виктор Михайлович