Gambhir, Kaweri and Sharma, Parag and Sharma, Chhavi and Kumar, Mahesh and Mehrotra, Ranjana (2019) Morphology induced plasmonic-excitonic interaction revealed by pump-probe spectroscopy. Optics and Laser Technology , 119. pp. 105674-105681. ISSN 0030-3992

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Abstract

Structure dependent relaxation and recombination dynamics of plasmons in three distinct colloidal plasmonic nanoshapes namely gold nanoflowers (GNF), gold nanopebbles (GNP), gold nanospheres (GNS) and a gold nanoislands film has been investigated with the help of ultrafast pump-probe spectroscopy. The structural transformation study revealed that the geometry plays a vital role in modulating the relaxation time of the plasmons. Further, an organic fluorescent dye (Eosin yellow, EY) is coupled with the aforementioned gold nanoshapes, to decipher the morphology directed excited state intermolecular interaction, amongst the plasmonic-organic hybrids in terms of their temporal and spectral modulations. Indeed, the experimental observations depict a reduction in the fluorescence lifetime of all the hybrids thereby confirming the presence of a non-radiative energy transfer within the hybrids. Variation in the coupling configuration of the EY with the aforementioned gold nanoshapes, lead to a tunable response time, providing a powerful means to alter the optical properties of plasmonic-organic hybrids. Overall, this study may not only help in a better understanding of excited the state dynamics of a coupled hybrid but also pave a way towards the realization of plasmonic-based active photonic devices.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Applied Physics/Condensed Matter Optics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	31 Dec 2020 11:33
Last Modified:	31 Dec 2020 11:33
URI:	http://npl.csircentral.net/id/eprint/4291

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