The excitation efficiency of a morphology-dependent resonance (MDR) by an incident beam is defined as the fraction of the beam power channeled into the MDR. The efficiency is calculated for a focused Gaussian beam of arbitrary width incident on either a spherical particle or a cylindrical fiber located at an arbitrary position in the plane of the beam waist. In each case a simple formula for the efficiency is derived by use of the localized approximation for the beam-shape coefficients in the partial-wave expansion of the beam. The physical interpretation of the efficiency formulas is also discussed.
© 1998 Optical Society of America
Original Manuscript: June 17, 1998
Revised Manuscript: August 21, 1998
Manuscript Accepted: September 1, 1998
Published: December 1, 1998
James A. Lock, "Excitation efficiency of a morphology-dependent resonance by a focused Gaussian beam," J. Opt. Soc. Am. A 15, 2986-2994 (1998)