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Proceedings Paper

High-multipole excitations of atoms by twisted photons near phase singularity (Conference Presentation)
Author(s): Andrei Afanasev; Carl E. Carlson; Asmita Mukherjee
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Paper Abstract

We calculate transition amplitudes and cross sections for excitation of hydrogen-like atoms by the twisted photon states, or photon states with more than one unit of angular momentum projection along the direction of propagation. If the target atom is located at distances of the order of atomic size near the vortex center, the transitions rates into $l_f>1$ states become comparable with the rates for standard electric dipole transitions. It is shown that when the transition rates are normalized to the local photon flux, the resulting cross sections for $l_f>1$ are singular near the optical vortex center, i.e., high-multipole excitations take place in the region of zero field intensity near phase singularity. Relation to the "quantum core" concept introduced by Berry and Dennis is discussed.

Paper Details

Date Published: 10 November 2016
PDF: 1 pages
Proc. SPIE 9922, Optical Trapping and Optical Micromanipulation XIII, 99220O (10 November 2016); doi: 10.1117/12.2238828
Show Author Affiliations
Andrei Afanasev, The George Washington Univ. (United States)
Carl E. Carlson, The College of William & Mary (United States)
Asmita Mukherjee, Indian Institute of Technology Bombay (India)

Published in SPIE Proceedings Vol. 9922:
Optical Trapping and Optical Micromanipulation XIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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