Internal and near-surface electromagnetic fields for a spherical particle irradiated by a focused laser beam

Abstract

A high-performance magnetic shield with large length-to-diameter ratio Rev. Sci. Instrum. 83, 065108 (2012) Radiation and near field in resistance-inductor circuit transients J. Appl. Phys. 111, 114907 (2012) Loss characterization of Mo-doped FeNi flake for DC-to-DC converter and MHz frequency applications J. Appl. Phys. 111, 07E329 (2012) The electron cyclotron resonance ion source with arc-shaped coils concept (invited) Rev. Sci. Instrum. 83, 02A312 (2012) Additional information on J. Appl. Phys.Theoretical expressions for the internal and external electromagnetic fields for an arbitrary electromagnetic beam incident upon a homogeneous spherical particle are derived, and numerical calculations based upon this theoretical development are presented. In particular, spatial distributions of the internal and near-surface electric field magnitude (source function) for a focused fundamental (TEMoo mode) Gaussian beam of 1.06.urn wavelength and 4.urn beam waist diameter incident upon a 5-,um-diam water droplet in air are presented as a function of the location of the beam focal point relative to the sphere center. The calculations indicate that the internal and near-surface electric field magnitude distribution can be strongly dependent upon relative focal point positioning and may differ significantly from the corresponding electric field magnitude distribution expected from plane-wave irradiation.

Plasmon spectra of nanospheres under a tightly focused beam

“…Morita et al [26], and Tsai and Pogorzelski [27] were the first to study the case of spherical particles illuminated by a Gaussian beam whose waist is smaller or larger than the particle size. A decade later, Barton et al [28] extended the study from the far field to the near and internal fields. Other authors have also considered the scattering properties of objects under Gaussian illumination [29,30,31,32].…”

Enhanced coupling to microsphere resonances with optical fibers

“…Even edge illumination with a focused beam excites MDR's more efficiently than do plane waves. 7,8 The offaxis Gaussian beam calculations have recently been realized by means of generalized Lorenz-Mie theory (GLMT). 9,10 In this paper we report, for the first time to our knowledge, exact formulas for the GLMT scattering cross sections to estimate the efficiency of the coupling (i.e., scattering) into the MDR's.…”

Biophotonics sensor acclimatization to stem cells environment

“…The theoretical model was simulated by adapting the Arbitrary Beam Theory (ABT) developed by [4,5]. The simulation was made using the same model as in [6,7].…”