期刊
JOURNAL OF APPLIED PHYSICS
卷 116, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4895836
关键词
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资金
- European FP7 Research Project NAMDIATREAM [NMP4-LA-2010-246479]
- PHC Ulysses program [32032WG]
Second Harmonic Generation (SHG) from BiFeO3 nanocrystals is investigated for the first time to determine their potential as biomarkers for multiphoton imaging. Nanocrystals are produced by an auto-combustion method with 2-amino-2-hydroxymethyl-propane-1,3-diol as a fuel. Stable colloidal suspensions with mean particle diameters in the range 100-120 nm are then obtained after wet-milling and sonication steps. SHG properties are determined using two complementary experimental techniques, Hyper Rayleigh Scattering and nonlinear polarization microscopy. BiFeO3 shows a very high second harmonic efficiency with an averaged < d > coefficient of 79 +/- 12 pm/V. From the nonlinear polarization response of individual nanocrystals, relative values of the independent d(ij) coefficients are also determined and compared with recent theoretical and experimental studies. Additionally, the particles show a moderate magnetic response, which is attributed to gamma-Fe2O3 impurities. A combination of high nonlinear optical efficiency and magnetic response within the same particle is of great interest for future bio-imaging and diagnostic applications. (C) 2014 AIP Publishing LLC.
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