Z-scan studies of nonlinear optical properties of colloidal gold nanorods and nanoshells

被引：9
|
作者：
Gordel, Marta [1 ,2 ]
Kolkowski, Radoslaw [1 ,3 ]
Olesiak-Banska, Joanna [1 ]
Matczyszyn, Katarzyna [1 ]
Buckle, Malcolm [2 ]
Samoc, Marek [1 ]
机构：
[1] Wroclaw Univ Technol, Inst Phys & Theoret Chem, PL-50370 Wroclaw, Poland
[2] CNRS, Ecole Normale Super, Lab Biol & Pharmacol Appl, F-94230 Cachan, France
[3] CNRS, Ecole Normale Super, Lab Photon Quant & Mol, F-94230 Cachan, France
来源：
JOURNAL OF NANOPHOTONICS | 2014年 / 9卷
关键词：
gold nanorods; gold nanoshells; Z-scan technique; nonlinear optical properties; REFRACTIVE-INDEX; NANOPARTICLES; ABSORPTION; DYNAMICS;
D O I：
10.1117/1.JNP.9.093797
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A quantitative comparison of third-order nonlinear optical properties of colloidal gold nanoshells (NSs) and gold nanorods (NRs) in water solutions has been carried out using open- and closed-aperture Z-scan measurements, performed with femtosecond laser pulses over a broad range of wavelengths. Absorption saturation was found to be a dominant effect for all the studied nanoparticles; however, two-photon absorption (2PA) properties were also detected, and were clearly resolved especially at the shortest wavelengths used. The value of the merit factor sigma(2)/M (2PA cross section scaled by the molecular weight) for the NRs (10 x 35 nm) at 530 nm is 7.5 (GM . mol/g), while for the NSs it is 1.9 (GM . mol/g) at the same wavelength. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
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页数：11
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