Спиновый угловой момент в остром фокусе цилиндрического векторного пучка с оптическим вихрем
Автор: Котляр В.В., Стафеев С.С., Телегин А.М.
Журнал: Компьютерная оптика @computer-optics
Рубрика: Дифракционная оптика, оптические технологии
Статья в выпуске: 6 т.47, 2023 года.
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Рассмотрена острая фокусировка светового поля с двойной (фазовой и поляризационной) сингулярностью. С помощью метода Ричардса-Вольфа получено точное аналитическое выражение для продольной проекции вектора спинового углового момента в фокусе. Из этого выражения следует, что в фокусе формируются 4( n - 1) субволновые области, n - порядок цилиндрического векторного пучка, центры которых лежат на окружности определенного радиуса с центром на оптической оси. Причем в соседних областях знак спинового углового момента разный. Это означает, что в соседних областях в фокусе свет имеет левую и правую эллиптические поляризации (спиновый эффект Холла). В центре фокуса вблизи оптической оси имеет место правая эллиптическая поляризация ( m > 0) или левая эллиптическая поляризация, если m 0 против часовой стрелки, а при m
Спиновый угловой момент, острая фокусировка, цилиндрический векторный пучок, оптический вихрь
Короткий адрес: https://sciup.org/140303254
IDR: 140303254 | DOI: 10.18287/2412-6179-CO-1347
Spin angular momentum at the sharp focus of a cylindrical vector vortex beam
Sharp focusing of a light field with double (phase and polarization) singularity is studied. Using the Richards-Wolf method, an exact analytical expression for the longitudinal projection of the spin angular momentum (SAM) vector at the focus is obtained. The expression derived suggests that 4 ( n -1) subwavelength regions are formed at the focus, where n is the cylindrical vector beam order, with their centers located on a certain circle centered on the optical axis. Notably, the SAM projections are found to have the opposite sign in the neighboring regions. This means that in the neighboring focal regions, the light has alternating left or right elliptical polarization (manifestation of a spin Hall effect). At the center of the focal spot near the optical axis, the field is right-handed elliptically polarized at m > 0, or left-handed elliptically polarized at m 0, and clockwise for m
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