Magnetic field control over microscopic symmetry properties of an optical pattern-forming system: theory

Citation
Ya. Logvin et al., Magnetic field control over microscopic symmetry properties of an optical pattern-forming system: theory, J OPT B-QUA, 2(3), 2000, pp. 426-431
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS
ISSN journal
1464-4266 → ACNP
Volume
2
Issue
3
Year of publication
2000
Pages
426 - 431
Database
ISI
SICI code
1464-4266(200006)2:3<426:MFCOMS>2.0.ZU;2-A
Abstract
Recent experimental work demonstrates a rich transition scenario between pa tterns of different symmetry (hexagons and squares) close to and beyond thr eshold in a sodium vapour cell with optical feedback dependent on the magni tude of an external magnetic field. We reproduce the observations in numeri cal simulations and explain them by calculating the quadratic coupling coef ficient between inhomogeneous modes which determines the pattern selection close to threshold. The observed scenario is in accordance with expectation s based on general symmetry principles and should occur in many systems, bu t apparently only in optical systems is it possible to tune the parameters continuously over a sufficiently large area to observe the complete bifurca tion scenario.