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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:47 |
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Conference: Bucharest University Faculty of Physics 2007 Meeting
Section: Polymer Physics
Title:
Fluorescence and Laser Action in Cylindrical Micro-Resonators
Authors:
Valentin Barna
Affiliation:
Facultatea de Fizica, Universitatea din Bucuresti, P.O.B MG-11,Ro-077125, Bucharest, Romania
E-mail
Keywords:
light emission,thermal wavelength tunability
Abstract:
Peculiar light emission properties have been observed in cylindrical microcavity hosting dye doped helixed liquid crystals, which behaves as a fiber-like multidirectional distributed feed-back laser. Experimental studies performed for this level of confinement show that laser action is exhibited both axially and radially, indicating a self-organized 3D blue phase-like configuration.
Thermal wavelength tunability was observed emphasizing two different linear behaviours. The distributed feedback mechanism and the Q factor of the mirrorless resonant cavity result enhanced for axial stimulated emission because of the significant increase in the number of helical periods. In addition, long-lived spectrally narrow defect modes appear within the photonic bandgap owing to optical phase jumps which take place in local structural defects. This level of integration might lead to new photonic chip architectures and devices, such as zero-threshold micro-lasers, phased array, discrete cavity solitons, filters and routers.
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