Nonlinear light transmission through oxide-protected Au and Ag nanoparticles: an investigation in the nanosecond domain

Saturable and reverse saturable absorption in aqueous silver nanoparticles at off-resonant wavelength

“…Similar switching behaviors have also been previously observed for silver nanowires/silica gel glass composite (Zheng et al 2010), Au:SiO 2 , Ag:ZrO 2 (Anija et al 2003), platinum nanoparticles (Gao et al 2005) and silver nanoparticles in PMMA (Deng et al 2008), under nanosecond irradiation at 532 nm. Different reasonings are given in the literature to explain the observed behavior.…”

“…This intensity threshold for the switching behavior is substantially low compared to the previous results (Gao et al 2005;Deng et al 2008;Anija et al 2003;Zheng et al 2010).…”

“…They observed a flip over from SA to RSA behavior at higher input irradiance. Similar kind of nonlinear optical absorption behavior is previously observed in Au/Ag coreshells (Anija et al 2003), Au-Ag alloy nanoclusters (Philip and Kumar 2000), Au nanorods (Elim et al 2006), Au nanocubes and nano-octahedra (Lee et al 2009) and platinum nanoparticles (Gao et al 2005) depending on the intensity of the incident radiation. Saturable absorption is attributed to the ground state plasmon bleach due to intraband electron excitation at moderate input intensities, while RSA at higher input intensities is attributed to various processes like, transient absorption from free carriers and photoejection of electrons, two photon absorption, nonlinear scattering etc.…”

“…It has been reported earlier that, metal nanoparticles exhibits a switch over behavior from SA to RSA when parameters like laser energy, particle-size and shape are changed (Gurudas et al 2008;Elim et al 2006;Lee et al 2009;Gao et al 2005;Deng et al 2008;Karthikeyan et al 2005;Karavanskii et al 2004;Unnikrishnan et al 2003;Anija et al 2003;Zheng et al 2010). For example, Gurudas et al studied the picosecond optical nonlinearity in silver nanodots prepared by pulsed laser deposition at 532 nm (Gurudas et al 2008).…”

Single-step, size-controlled synthesis of colloidal silver nanoparticles stabilized by octadecylamine

“…(3) Nonlinear optical study: Open aperture z-scans [30,31] were performed at the surface plasmon resonance wavelength of 430 nm, using 100 fs laser pulses to measure the optical nonlinearity of Ag nanoparticles. A frequency-doubled Ti:Sapphire laser system (TSA-10, Spectra Physics) emitting at 430 nm was used for exciting the samples.…”