title: Quasi-scaling of the extinction efficiency of spheres in high frequency Bessel beams.
abstract: The extinction efficiency Qext of a sphere is defined to be the ratio of its extinction cross section to the area of its profile. For non-dissipative situations Qext reduces to the scattering efficiency. For a sphere centered on the axis of a Bessel beam Qext has a complicated dependence on dimensionless frequency ka and on the conic angle β of the beam, even in the simple case of a rigid sphere. With appropriate scaling using Babinet's principle, however, the dependence reduces approximately to a function of ka sin(β) when ka is large. An example is also shown for a metal shell in water.
authors.affiliation: Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814.
authors.forename: Philip L
authors.initials: PL
authors.lastname: Marston