Picosecond optical nonlinearity in monolayer-protected gold, silver, and gold-silver alloy nanoclusters

Philip, Reji; Kumar, G. Ravindra; Sandhyarani, N.; Pradeep, Thalappil

doi:10.1103/physrevb.62.13160

Cited by 293 publications

(185 citation statements)

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“…The surface plasmon resonance in metal nanoparticles is not only responsible for their linear optical properties but also governs the nonlinear optical effects. Near the surface plasmon resonance, metal nanoparticles exhibit immensely enhanced optical nonlinearities as compared to their bulk counterparts [3][4][5][6]. Smaller metal nanoparticles, namely, the nanoclusters containing a few atoms are a new class of materials with characteristics in between those of atoms and nanoparticles [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast photoinduced enhancement of nonlinear optical response in 15-atom gold clusters on indium tin oxide conducting film

et al. 2013

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Abstract:We show that the third order optical nonlinearity of 15-atom gold clusters is significantly enhanced when in contact with indium tin oxide (ITO) conducting film. Open and close aperture z-scan experiments together with non-degenerate pump-probe differential transmission experiments were done using 80 fs laser pulses centered at 395 nm and 790 nm on gold clusters encased inside cyclodextrin cavities. We show that two photon absorption coefficient is enhanced by an order of magnitude as compared to that when the clusters are on pristine glass plate. The enhancement for the nonlinear optical refraction coefficient is ~3 times. The photo-induced excited state absorption using pump-probe experiments at pump wavelength of 395 nm and probe at 790 nm also show an enhancement by an order of magnitude. These results attributed to the excited state energy transfer in the coupled gold cluster-ITO system are different from the enhancement seen so far in charge donor-acceptor complexes and nanoparticle-conjugate polymer composites. 4553-4558 (1983). 4.D. Ricard, P. Roussignol, and C. Flytzanis, "Surface-mediated enhancement of optical phase conjugation in metal colloids," Opt. Lett. 10(10), 511-513 (1985). 5.M. J. Bloemer, J. W. Haus, and P. R. Ashley, "Degenerate four-wave mixing in colloidal gold as a function of particle size," J. Opt. Soc. Am. B 7(5), 790-795 (1990). 6. R. Philip, G. R. Kumar, N. Sandhyarani, and T. Pradeep, "Picosecond optical nonlinearity in monolayer-protected gold, silver and goldsilver alloy nanoclusters," Phys. Rev. B 62(19), 13160-13166 (2000). 7.T

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Section: Introductionmentioning

confidence: 99%

Ultrafast photoinduced enhancement of nonlinear optical response in 15-atom gold clusters on indium tin oxide conducting film

et al. 2013

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“…Absorption saturation associated with SPR in metallic nanoparticles has been reported before. 8,38 Generally SPR will decay through the channels of radiative emission, interband excitation, and intraband excitation. As CuS has no radiative emission around 800 nm (1.55 eV) and interband transition requires a relatively higher energy of 2.3 eV, plasmon excitation decays mainly through intraband excitation generating more free carriers.…”

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confidence: 99%

Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots

2014

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We report facile preparation of water dispersible CuS quantum dots (2–4 nm) and nanoparticles (5–11 nm) through a nontoxic, green, one-pot synthesis method. Optical and microstructural studies indicate the presence of surface states and defects (dislocations, stacking faults, and twins) in the quantum dots. The smaller crystallite size and quantum dot formation have significant effects on the high energy excitonic and low energy plasmonic absorption bands. Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles.

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“…Nonetheless, the Ar irradiation, and consequently the NPls formation, seems to have a strong effect on the corresponding saturation intensities which resulted to be very different for the two systems. This is particularly important since it is the saturation intensity that controls the dominant behavior of these materials at high laser intensities, which changes from primarily RSA before Ar irradiation to SA after irradiation.The occurrence of SA and RSA processes at the same laser wavelength for different intensities has been observed in the past by Philip et al in chemically synthesized AuAg nanoclusters in liquid solutions [11]. According to the authors, the ground-state plasmon bleaching is responsible for the SA behavior observed at moderate intensities; conversely, RSA is due to free carrier absorption and becomes significant for increased pump intensities.…”

Section: Resultsmentioning

confidence: 78%

Nonlinear optical properties of Au–Ag nanoplanets made by ion beam processing of bimetallic nanoclusters in silica

Cesca

Pellegrini

Bello

et al. 2010

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tThe nonlinear absorption of Au-Ag nanoplanets made by Ar irradiation of bimetallic nanoclusters in silica has been experimentally investigated by means of the single beam z-scan technique. The measurements have been performed in the picoseconds regime in order to isolate the fast electronic contribution to the third-order nonlinearity. The results reveal large nonlinear absorption properties of these systems, characterized by the concomitance of saturable and reverse saturable absorption. A phenomenological expression has been developed to fit the z-scan curves and to quantitatively determine the nonlinear optical parameters.

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Picosecond optical nonlinearity in monolayer-protected gold, silver, and gold-silver alloy nanoclusters

Cited by 293 publications

References 40 publications

Ultrafast photoinduced enhancement of nonlinear optical response in 15-atom gold clusters on indium tin oxide conducting film

Ultrafast photoinduced enhancement of nonlinear optical response in 15-atom gold clusters on indium tin oxide conducting film

Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots

Nonlinear optical properties of Au–Ag nanoplanets made by ion beam processing of bimetallic nanoclusters in silica

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