Abstract
A nonlinear photoacoustic (PA) response from solutions of 40 nm plasmonic titanium nitride nanoparticles (NPs) synthesized by laser ablation in a liquid environment (acetone) is reported. Using a photoacoustic Z-scan with 5 ns pumping pulses, values of effective nonlinear absorption (NLA) coefficients ${\beta _{\text{PA,eff}}}$ were measured and found to be 3.27±0.17 × 10-8, 6.41±0.32 × 10-8, and 3.22±0.16 × 10-8 for 600, 700, and 800 nm pumping wavelengths, respectively. To take into account the influence of nonlinear scattering, absorption-dependent PA measurements were carried out together with the optical Z-scan, and the obtained data were compared. The origin of the effective absorptive nonlinearity is discussed based on combined NLA in NPs, nonlinear scattering, and bubble generation triggered by NP-mediated light absorption. Potential applications include biomedical diagnostics and therapy.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Nikolaos Karampitsos, Dimitrios Kyrginas, and Stelios Couris
Opt. Lett. 45(7) 1814-1817 (2020)
Rajesh Kumar Yadav, J. Aneesh, Rituraj Sharma, Tuhin Kumar Maji, Debjani Karmakar, and K. V. Adarsh
Opt. Lett. 45(24) 6655-6658 (2020)
Yu-Hsin Chen, J. Ryan Peterson, Luke A. Johnson, Theodore G. Jones, Bahman Hafizi, Alexander B. Stamm, Antonio C. Ting, John P. Palastro, Michael H. Helle, and Dmitri Kaganovich
Opt. Lett. 45(15) 4344-4347 (2020)