Світловий тиск на наночастинки у полі зустрічних біхроматичних хвиль з додатковим каналом релаксації населеності збудженого стану

• Дата: 2023
• Автори: Romanenko, V.I., Kornilovska, N.V., Yatsenko, L.P.
• Формат: Стаття
• Мова: English; Ukrainian
• Опубліковано: Publishing house "Academperiodika" 2023
• Теми: atoms; nanoparticles; laser radiation; light pressure; атоми; наночастинки; лазерне випромiнювання; свiтловий тиск
• Онлайн доступ: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2022599
• Назва журналу: Ukrainian Journal of Physics

Light pressure on nanoparticles containing impurity atoms or color centers interacting resonantly with the field has been considered. In the general case, the available crystalline environment of atoms prohibits the formation of a two-level interaction scheme of the atom or the color center with the field by eliminating the prohibition on some transitions with spontaneous radiation emission. As a result, some atoms remain temporarily in the states that do not interact with the laser radiation field, but relax in time to the ground state. A theory which enables the calculation of the light-pressure force on atoms or color centers (and, accordingly, on the nanoparticle, where they are located) and its dependence on the atom–field interaction parameters, as well as the relaxation parameters of the excited and intermediate states, has been developed. To analyze the influence of various factors on the light-pressure force, calculations are made for a model set of parameters and for the parameters corresponding to the interaction between triply charged erbium ions in erbium-doped Y2SiO5 crystals and color centers that emerge owing to the occupation of defects in diamond crystals by silicon atoms. It turned out that the color centers make it possible to reinforce the light pressure on small, much smaller than the light wavelength, nanoparticles by several orders of magnitude.