Lightguides with core cross-section bounded by two spirals: Effect of curvature on dispersion curves

Citation
M. Joshi et al., Lightguides with core cross-section bounded by two spirals: Effect of curvature on dispersion curves, OPTIK, 111(8), 2000, pp. 375-377
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
OPTIK
ISSN journal
00304026 → ACNP
Volume
111
Issue
8
Year of publication
2000
Pages
375 - 377
Database
ISI
SICI code
0030-4026(2000)111:8<375:LWCCBB>2.0.ZU;2-#
Abstract
Recently Sing ct at. [1-2] investigated the dispersion characteristics and cutoff conditions of a wave guide whose guidng cross-section was assumed to be bounded by two spirals, r=ce-theta(2)/2 and r=be -theta(2)/2. In that p aper [2] the width (b - c) is allowed to change by changing the parameter b and keeping c fixed at 2.0 mu m. Here in this paper, we want to study how the dispersion characteristic change with curvature considering a few more fixed values of c. We choose c = 4.0 mu m and c = 6.0 mu m, so that the ave rage curvature may be less than curvature corresponding to c = 2.0 mu m. It is found that as the curvature of the guide decreases the number of sustai ned modes for a given value V shows a tendency to decrease.