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Continuous wave random lasing in naturally occurring biocompatible pigments and reduction of lasing threshold by using triangular silver nanostructures as scattering media

Abstract

Random lasers find enormous applications in several fields, including in speckle free imaging and in bio-imaging. Thus, recently random laser (RL) generation (mostly under pulsed operation) have been demonstrated in several commercial organic dyes having high photoluminescence quantum yields (PLQY). Although the commercials organic dyes have high PLQY but it has several limitations, particularly all of those dyes are not bio-compatible and so cannot be used in in-vivo bio-imaging. In this work, a rarely reported bio-inspired continuous-wave (CW) RL generation has been demonstrated at ca. 674 nm, pumped by a low power He-Ne laser, in naturally occurring pigments of Hibiscus rosa-sinensis leaves extract (HRLe). The lasing threshold has been reduced by ~2.4 times from 40.7 W/cm2 (without scatterer) to 16.8 W/cm2 by using anisotropic triangular nanostructures of silver (TNS) as scatterer with a typical number density of 8×1015 nos./ml. Further RL generation at ca. 691.7 nm with spectrally narrowed emission modes having line-width of ca. 1 nm along-with a very low lasing threshold of 15 W/cm2 has been demonstrated, unprecedentedly, in a thin film of polyvinyl alcohol doped with methylene blue dye and TNS. This work will open a new era of development of bio-inspired RL for bio-photonics applications.

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Supplementary files

Publication details

The article was received on 19 Aug 2017, accepted on 09 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR06183H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Continuous wave random lasing in naturally occurring biocompatible pigments and reduction of lasing threshold by using triangular silver nanostructures as scattering media

    S. Biswas and P. KUMBHAKAR, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06183H

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