Saturable absorption and reverse saturable absorption in platinum nanoparticles

Gao, Yachen; Zhang, Xueru; Li, Yuliang; Liu, Hanfan; Wang, Yuxiao; Chang, Qing; Jiao, Weiyan; Song, Yinglin

doi:10.1016/j.optcom.2005.03.003

Cited by 246 publications

(99 citation statements)

References 20 publications

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“…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.…”

supporting

confidence: 79%

“…Thus by varying the input intensity in the range 28-175 MW/cm 2 , the sample exhibited SA as well as RSA behavior. Such a changeover in the sign of nonlinearity can be generally modelled by defining a nonlinear absorption coefficient α(I ) which is a sum of independent positive and negative transmissioon coefficients (Gao et al 2005). To interpret the flip of SA around the beam waist, we combine the SA coefficeint and the TPA coefficient to yield the total absorption coefficient as,…”

Section: Resultsmentioning

confidence: 99%

“…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).…”

mentioning

confidence: 99%

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

et al. 2011

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Silver nano-colloid was prepared by chemical reduction method and its nonlinear absorption properties were investigated by using open aperture z-scan experiment with nanosecond laser pulses operating at 532 nm. Interestingly, a switch over from saturable absorption to reverse saturable absorption was observed when the input intensity is increased from 28.1 to 175.8 MW/cm 2 . The underlying mechanism responsible for the observed switching behaviour is the interplay between ground state plasmon band bleaching and excited state absorption. Theoretical fitting was done by using a model in which nonlinear absorption coefficient as well as saturation intensity are incorporated.

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supporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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

et al. 2011

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“…I is the intensity of light averaged over a period and 2 η is the nonlinear refractive index of the material. The total absorption, α, under saturation can be expressed as [22]:…”

Section: Optical Properties Of Metal Nanoparticlesmentioning

confidence: 99%

“…The electric field of a Gaussian beam having waist radius 0 w and traveling in the Z + direction is represented as 22 ( …”

Section: φ=∆ =mentioning

confidence: 99%