28 February 2006 Resonant absorption in nanometer gold spherical particles
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Abstract
Resonance effects can occur upon laser absorption by micro and nanoparticles when a train of pulses is used. The pressure generated by the train of pulses may be significantly different than the pressure generated by a single pulse with the same total energy. For pulsed lasers with a gap duration between pulses that is an integer multiple of the characteristic oscillation time of the absorber, constructive interference occurs and the pressure is increased. For pulsed lasers with a gap duration between pulses that is an half integer multiple of the characteristic oscillation time of the absorber, destructive interference occurs and the pressure is significantly decreased. We present numerical computations showing the manifestation of this effect in gold particles with a radius of 100 nm. The resonance effects have implications for damage thresholds and therapeutic applications of laser radiation.
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Eshel Faraggi, Eshel Faraggi, Bernard S. Gerstman, Bernard S. Gerstman, } "Resonant absorption in nanometer gold spherical particles", Proc. SPIE 6084, Optical Interactions with Tissue and Cells XVII, 608405 (28 February 2006); doi: 10.1117/12.644815; https://doi.org/10.1117/12.644815
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