alexa Ultrasensitive Time-resolved Random Laser Spectroscopy: Excited State Relaxation Of Dye Molecules Embedded In Hybrid Materials
ISSN: 2169-0022

Journal of Material Sciences & Engineering
Open Access

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3rd International Conference and Exhibition on Materials Science & Engineering
October 06-08, 2014 Hilton San Antonio Airport, USA

Joaquin Fernandez, Sara Garc?a-Revilla, Rolindes Balda, Luis Carlos, M Angeles Arriandiaga, I?aki Iparraguirre and Jon Azkargorta
Accepted Abstracts: Material Sci Eng
DOI: 10.4172/2169-0022.S1.017
Abstract
The understanding of energy transfer processes in biological systems occurring among optical centres which exhibit in homogeneously broadened spectral bands is of paramount importance to determine time constants and spatial distribution of energy flow. Here we report a new time resolved-spectroscopy based on the own random laser generation of the optical probes. As an example, we experimentally investigate the excited state relaxation of rhodamine B molecules in an organic-inorganic hybrid material. We demonstrate that even in the case of spectral overlap between donor and acceptor (monomer and dimer) emissions, this kind of spectroscopy may resolve not only the spectral features of the system but also provide a high speed picture of the energy transfer and excited state relaxation of the involved optical probes. Our results can be easily applied to any kind of efficient interacting chromophore pairs embedded in inhomogeneous scattering structures such as biological tissues.
Biography
Joaqu?n Fern?ndez is full Professor of Physics at the University of the Basque Country (Spain) since 1983. His field of specialization embraces light-matter interaction processes including among others: Laser and Photothermal spectroscopy, photonic devices, interionic interaction and energy transfer, laser cooling of solid state materials, and laser generation in inhomogeneous hybrid photonic materials. He is author of more than two hundred fifty publications in peer reviewed journals and member of various international scientific committees.
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