Tuning ultrafast photoresponse of gold nanorods

Kumar, Sunil and Anija, M and Sood, AK (2013) Tuning ultrafast photoresponse of gold nanorods. In: Plasmonics, 8 (3). pp. 1477-1483.

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Abstract

Nondegenerate pump probe differential transmission experiments on gold nanorods with varying longitudinal surface plasmon resonance have revealed a new phenomenon where the polarity of the transient transmission signal can be reversibly switched between photo bleaching and photo-induced absorption by controlling probe fluence. Under the usual case where probe fluences are nominal, photo bleaching effect is observed for the nanorods with longitudinal surface plasmon resonance energy smaller than the probe photon energy. The laser-induced melting of the nanorods or change in their shape is ruled out for the observed optical switching effect. A quantitative understanding of the results is attempted by invoking a cascaded two-photon absorption dominant beyond a threshold probe fluence of similar to 75 mu J/cm(2).

Item Type:	Journal Article
Publication:	Plasmonics
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Ultrafast Spectroscopy; Gold Nanorods; Surface Plasmon Resonance; Transient Absorption; Coherent Phonons
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	23 Sep 2013 09:54
Last Modified:	23 Sep 2013 09:54
URI:	http://eprints.iisc.ac.in/id/eprint/47391

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