naa a22 4500 510816231 CHVBK 20180411083508.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11468-013-9561-7 doi (NATIONALLICENCE)springer-10.1007/s11468-013-9561-7 Tuning Ultrafast Photoresponse of Gold Nanorods [Elektronische Daten] [Sunil Kumar, M. Anija, A. Sood] 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 ∼75μJ/cm2. Springer Science+Business Media New York, 2013 Ultrafast spectroscopy nationallicence Gold nanorods nationallicence Surface plasmon resonance nationallicence Transient absorption nationallicence Coherent phonons nationallicence Kumar Sunil Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut Anija M. Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut Sood A. Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1477-1483 1557-1955 8:3<1477 2013 8 11468 https://doi.org/10.1007/s11468-013-9561-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-013-9561-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kumar Sunil Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut NATIONALLICENCE 700 1- Anija M. Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut NATIONALLICENCE 700 1- Sood A. Department of Physics, Indian Institute of Science, 560012, Bangalore, India aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1477-1483 1557-1955 8:3<1477 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer