Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-13-14781
Timestamp: 2019-04-21 18:47:08+00:00

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Enhanced photoacoustic (PA) intensity from gold nanosphere and nanorod colloidal suspensions in water under tightly-focused femtosecond pulsed laser irradiation was systematically investigated. PA signal amplitudes were measured by ultrasound transducers at frequencies of 5, 10, and 25 MHz. The experimental results revealed a linear-dependence of the relative photoacoustic amplitude on the laser power and the mechanism was attributed to non-radiative relaxation dynamics of surface plasmon oscillations. When gold nanorod with longitudinal absorption/extinction peak at 800 nm coincides with the wavelength of femtosecond laser pulses, the most efficient PA signal is generated. Laser excitation was kept within a thermal stability region of gold nanoparticles, i.e., colloidal suspension can be continuously reused for PA generation.
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Fig. 1 (a) TEM images of Au nanospheres with a diameter of 20 nm and nanorods with dimensions of 12 × 35 nm or aspect ratio of 2.92. (b) Absorption spectra of Au nanospheres and nanorods together with emission spectrum of femtosecond laser centered at 800 nm.
Fig. 2 (a) Experimental setup for photoacoustic detection. (b) Schematics of photoacoustic signal measurement. (c) The typical photoacoustic transient observed with oscilloscope; arrows mark the first and second waves, respectively (see, (b)).
Fig. 3 Dependence of PA signal amplitude on laser power in H2O (a), Au nanosphere (b), and Au nanorod (c) colloidal suspensions. Comparison of PA amplitudes at different frequencies when the laser power was set at 100 mW (d).
Fig. 4 Absorption spectra of Au nanospheres (a) and nanorods (b) before and after laser irradiation. Transverse (T-) and longitudinal (L-) modes of nanorods are shown.
Fig. 5 Numerical modeling of light field, E, enhancement for Au nanorod and nanosphere by finite difference time domain (FDTD) method (Lumerical). Au nanorods of 35-nm-long and 12-nm-wide had plasmonic resonances at 505 and 710 nm wavelengths for the transverse and longitudinal bands, respectively (these wavelengths are slightly different from experimental extinction peaks (Fig. 4), most probably, due to slight difference in size). Light enhancement maps of Au nanosphere of 20-nm-diameter is shown on the bottom row. Incident field intensity of a plane wave was E2 = 1. The field enhancement values are from 3 to 10.

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