Journal
OPTICS COMMUNICATIONS
Volume 202, Issue 1-3, Pages 17-20Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0030-4018(01)01722-9
Keywords
nonparaxial propagation; Gaussian beams
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We present a formalism describing optical propagation in a homogeneous medium of a fully vectorial highly nonparaxial field, characterized by a waist smaller than the wavelength. The method allows us to derive an analytical expression for a field possessing an initial Gaussian transverse distribution of width w, in the extreme nonparaxial regime w < lambda, valid for propagation distances z greater than or similar to d, where d = w(2)/lambda is the diffraction length. (C) 2002 Elsevier Science B.V. All rights reserved.
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