Photonic jets from resonantly excited transparent dielectric microspheres

Abstract

We report on the theoretical investigations of the near-field diffraction patterns from micrometer-sized spherical dielectric particles illuminated by a light wave upon the excitation of morphology-dependent resonances in the internal field. The specific spatial area, which constitutes the so-called photonic jet (PJ), is studied. The longitudinal and transverse dimensions of the PJ are calculated along with its peak intensity as a function of the distance from a particle. The numerical calculations show that at a resonance depending on its quality factor, the PJ can "stick" to the particle; its intensity can increase to a several orders of magnitude, and its width can decrease but mostly near the microsphere surface. The average length of the PJ remains nearly unchanged.

Photonic jet generated by spheroidal particle with Gaussian-beam illumination

“…Later, Ding et al [14] analyzed the influence of refractive index contrast on the properties of the photonic jet by simulating the electric field distributions. Geints et al systematically investigated the spatial and amplitude characteristics of photonic jets emerging from homogeneous and layered dielectric particles [15][16][17], and theoretically analyzed differences between the resonant and nonresonant photonic jets [18][19][20].…”

An investigation of semiconductor nanoparticles for application to all-optical switching

“…The fringes result from i. longitudinal modes, which form along the optical axis and lead to the steep high-spatial-frequency fringes seen in the intensity map, and ii. coupled longitudinal-whispering-gallery modes [13] , which form interferometric beating and lead to the sloped low-spatial-frequency fringes. This resonance can be eliminated by using structures that are sufficiently large, compared to the wavelength, or pulse durations that are less than the round-trip cavity time.…”

Resonant laser focus light by uniformity dielectric microcylinder

“…Минимальный размер фокуса был получен FWHM = 0,46λ [6]. В [7,8] моделировалась резонансная фокусировка света микросферами. В [7] с помощью ди-электрической микросферы вместе с нанометровым ме-таллическим шариком получена резонансная фокуси-ровка света в пятно с диаметром FWHM = 0,25λ, а для диэлектрической микросферы получен резонансный фокус размером FWHM = 0,40λ [8].…”