Optical Phenomena in Mesoscale Dielectric Spheres and Immersion Lenses Based on Janus Particles: A Review

Magnetic Concentric Hot-Circle Generation at Optical Frequencies in All-Dielectric Mesoscale Janus Particles

“…Detailed studies of the resonance properties of such a Janus particle are given in previous literature [29]. The work of the Janus particle can be clearly explained based on the geometric-optical approximation shown in Figure 3 [30]. When radiation is incident at an angle of total internal reflection χ 0 = arcsin(n m /n p ), flat surfaces play the role of a mirror.…”

“…The interference of the waves incident on a flat surface at angles of total internal reflection creates high-intensity evanescent fields near the surface, for example, at n = 1.5 and χ 0 ∼ = 41.8 0 < 45 0 ; however, for small truncations of a cylindrical particle, the first resonance should be observed at χ ≈ π/4 = 45 • . The difference in the angle value χ is explained by the fact that on the line of the intersection of a flat section with a cylindrical surface, a wave phase-jump occurs, which can be determined from the generalized law of refraction [30][31][32]:…”

“…where dΦ/dx is the change in the phase gradient of the wave depending on the height of the truncated element h. In this case, the angle of total internal reflection changes as [30]:…”

“…Since the refractive index of water is intermediate between the refractive index of the particle and vacuum, this part of the particle acts as a dielectric matching layer that reduces reflection from a flat surface [34]. The formation of a photonic jet, in this case, is due to the specific distribution of the hot spots and vortices [26,30] inside the particle and the low-index dielectric layer in its shadow portion, which is shown in Figure 5. With an increase in the contrast of the refractive index and in the dielectric layer with a high refractive index, zones of hot spots with high intensities are formed, as shown in Figure 6.…”

О Суперразрешении В Мнимом Изображении В Прозрачной Диэлектрической Сфере

“…Матрица рассеяния S действует на разложение источников в ближней зоне, в предположении что источники находятся вне частицы. При построении матрицы рассеяния S будем исходить из соотношений (13), (14). Пусть четные компоненты вектора E im 1/2 содержат четные компоненты разности E im 1 − AE, а нечетные компоненты E im 1/2 cодержат нечетные компоненты E im 2 .…”