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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:16 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Polymer Physics
Title:
Distributed Feedback Micro-Laser Array: Helixed Liquid Crystals Embedded in Holographically Sculptured Polymeric Microcavities
Authors:
V. Barna(1,2), G. Strangi(1), A. De Luca (1), C. Versace1, N. Scaramuzza (1), C. Umeton(1) and R. Bartolino(1)
Affiliation:
(1)LICRYL-INFM and Center of Excellence CEMIF.CAL
Department of Physics, University of Calabria, I-87036 Rende (CS), Italy
(2)Faculty of Physics, University of Bucharest, Magurele,CP MG-11,Romania.
E-mail
Keywords:
mesophases, liquid crystal, discrete cavity solitons
Abstract:
The concept of wave transport in complex media, in particular the propagation of electromagnetic waves in dielectric periodic structures represents a topic of great interest in various fields of scientific research. A color tunable DFB microcavity laser was created by confining self-organized mesophases doped with fluorescent guest molecules into holographically patterned polymeric microchannels. The LC micro-channels act as mirror-less cavity lasers, where the emitted laser light propagates along the liquid crystal superhelical axis behaving as Bragg resonator. The laser action was observed at the low energy edge of the bandgap where a sharp increase of the photonic density of states (DOS) is expected. The miniaturization process allows to obtain a micro-laser array possessing an ultralow lasing threshold (25nJ/pulse) while having directional control on the lasing emission, a fine wavelength tunability and the control over the emission intensity. 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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