Resonance scattering of a dielectric sphere illuminated by electromagnetic Bessel non-diffracting (vortex) beams with arbitrary incidence and selective polarizations

Mitri, F.G.; Li, R.X.; Guo, Lixin; Ding, Chunying

doi:10.1016/j.aop.2015.06.004

Cited by 49 publications

(8 citation statements)

References 65 publications

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“…(37) since the scattering coefficients for a perfectly conducting cylinder [given by Eq. (22)] do not depend on the refractive index m. The factor cond sca Q corresponds to a "background" that may be subtracted from the scattering efficiency sca Q (or the scattering cross-section σ sca ) to allow adequate isolation of the resonances of a dielectric sphere in plane waves [37][38][39] and Bessel (vortex) beams [43].…”

Section: Efficiencies Of An Absorptive Circular Cylinder In Plane Wavmentioning

confidence: 99%

Generalization of the optical theorem for monochromatic electromagnetic beams of arbitrary wavefront in cylindrical coordinates

Mitri

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Section: Efficiencies Of An Absorptive Circular Cylinder In Plane Wavmentioning

confidence: 99%

Generalization of the optical theorem for monochromatic electromagnetic beams of arbitrary wavefront in cylindrical coordinates

Mitri

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Since the incident Bessel waves constitute a superposition of plane waves propagating over a cone with a half-angle , it is then anticipated that the scattering would be large at   , which corresponds to the forward scattering of the individual n th plane-wave component with half-cone angle  n . For instance, recent investigations in optical scattering of Bessel waves from a sphere revealed a similar behavior [55][56][57][58]. Significant changes appear in the plots the more prolate the spheroid becomes, as shown in panels (D)-(E); at ka = 7, the scattering enhancement is extended over a large region in (, ), for which its values decrease as ka increases.…”

Section: B Computations Of the Near-and Far-field Scattering From Sph...mentioning

confidence: 56%

Section: B Computations Of the Near-and Far-field Scattering From Spmentioning

confidence: 85%

Axisymmetric scattering of an acoustical bessel beam by a rigid fixed spheroid

Mitri

2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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-Based on the partial-wave series expansion (PWSE) method in spherical coordinates, a formal analytical solution for the acoustic scattering of a zeroth-order Bessel acoustic beam centered on a rigid fixed (oblate or prolate) spheroid is provided. The unknown scattering coefficients of the spheroid are determined by solving a system of linear equations derived for the Neumann boundary condition. Numerical results for the modulus of the backscattered pressure ( = ) in the near-field and the backscattering form function in the far-field for both prolate and oblate spheroids are presented and discussed, with particular emphasis on the aspect ratio (i.e., the ratio of the major axis over the minor axis of the spheroid), the half-cone angle of the Bessel beam , and the dimensionless frequency. The plots display periodic oscillations (versus the dimensionless frequency) due to the interference of specularly reflected waves in the backscattering direction with circumferential Franz' waves circumnavigating the surface of the spheroid in the surrounding fluid. Moreover, the 3D directivity patterns illustrate the nearand far-field axisymmetric scattering. Investigations in underwater acoustics, particle levitation, scattering, and the detection of submerged elongated objects and other related applications utilizing Bessel waves would benefit from the results of the present study.

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“…All these properties make the optical HOBVB an attractive candidate from the standpoint of particle manipulation and handling applications. Various investigations recognizing the importance and utility of the HOBVB considered the case of a sphere, and examined the resonance scattering [49], radiation forces [42,43,50,51] and torques [45,46,48]. Nonetheless, in some instances, the actual shapes of a variety of objects deviate significantly from the spherical geometry.…”

Section: Introductionmentioning

confidence: 99%

Optical Bessel beam illumination of a subwavelength prolate gold (Au) spheroid coated by a layer of plasmonic material: radiation force, spin and orbital torques

Mitri

2017

J. Phys. Commun.

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The optical radiation force, spin and orbital torques exerted on a subwavelength prolate gold spheroid coated by a layer of plasmonic material with negative permittivity and illuminated by either a zerothorder (non-vortex) or a first-order vector Bessel (vortex) beam are computed in the framework of the electric dipole approximation method. Calculations for the Cartesian components of the optical radiation force on a subwavelength spheroid with arbitrary orientation in space are performed, with emphasis on the order (or topological charge), half-cone angle of the beam, and the plasmonic layer thickness on-and off-resonance. A repulsive (pushing) force is predicted for the layered subwavelength prolate spheroid, on-and off-resonance along the direction of wave propagation. Moreover, the Cartesian components of the spin radiation torque are computed where a negative longitudinal spin torque component can arise, suggesting a rotational twist of the spheroid around its center of mass in either the counter-clockwise or the clockwise (negative) direction of spinning. In addition, the longitudinal component of the orbital radiation torque exhibits sign reversal, indicating a revolution around the beam axis in either the counter-clockwise or the clockwise directions. The results show that the plasmonic resonance strongly alters the force, spin and orbital torque components, causing major amplitude enhancements, signs twists, and complex distributions in the transverse plane.

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Resonance scattering of a dielectric sphere illuminated by electromagnetic Bessel non-diffracting (vortex) beams with arbitrary incidence and selective polarizations

Cited by 49 publications

References 65 publications

Generalization of the optical theorem for monochromatic electromagnetic beams of arbitrary wavefront in cylindrical coordinates

Generalization of the optical theorem for monochromatic electromagnetic beams of arbitrary wavefront in cylindrical coordinates

Axisymmetric scattering of an acoustical bessel beam by a rigid fixed spheroid

Optical Bessel beam illumination of a subwavelength prolate gold (Au) spheroid coated by a layer of plasmonic material: radiation force, spin and orbital torques

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