Faculty of Physics - University of Bucharest

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Conference: Bucharest University Faculty of Physics 2005 Meeting

Section: Polymer Physics

Title:

DFB Micro-Laser Array: Helixed Liquid Crystals Embedded in Holographically Sculptured Polymeric Microcavities

Authors:

G. Strangi, V. Barna, R. Caputo, A. De Luca, C. Versace, N. Scaramuzza, C. Umeton, R. Bartolino and G. N. Price

Affiliation:

LICRYL-INFM and Center of Excellence CEMIF.CAL

Department of Physics, University of Calabria, I-87036 Rende (CS), Italy and Department of Physics and FLCMRC - Ferroelectric Liquid Crystal Materials Research Center, University of Colorado, Boulder, Colorado 80309-0390, USA

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Keywords:

Abstract:

Distributed feedback microstructures play a fundamental role in confining and manipulating light to obtain lasing in media with gain. Here, we present an innovative array of organic, color-tunable, micro-lasers which are intrinsically phase locked. Dye-doped helixed liquid crystals were embedded within periodic, polymeric micro-channels sculptured by light through a single-step process. The helical superstructure of the liquid crystal was oriented along the planar micro-channels; the lasing was observed along the same direction at the red-edge of the stop band. This level of integration of guest-host systems (self-organized mesophases doped with fluorescent molecules), embedded in artificially patterned small sized structures, might lead to new photonic chip architectures and devices such as zero-threshold micro-lasers, phased array, discrete cavity solitons, filters and routers. References: [1] P. Rigby, T.F. Krauss, Nature 390, 125 (1997) [2] G. Strangi, et al. Physical Review Letters 94, 063903 (2005)