title: An exact transverse Helmholtz equation.
abstract: We derive an exact equation for the transverse component of the electric field propagating along a given longitudinal z direction in the presence of an isotropic refractive-index distribution n(x,y).
authors.affiliation: Dipartimento di Fisica, Universita' dell'Aquila, 67100 L'Aquila, Italy, and Centro di Ricerca e Sviluppo SOFT.CNR, Universita' di Roma La Sapienza, 00185 Roma, Italy. bcross@caltech.edu
authors.forename: Bruno
authors.initials: B
authors.lastname: Crosignani
authors.forename: Paolo
authors.initials: P
authors.lastname: Di Porto
authors.forename: Amnon
authors.initials: A
authors.lastname: Yariv