Observation of a fifth order optical nonlinearity in 29kDa Au@alkanethiol clusters excited in the visible

Thomas, Jinto; Anija, M.; Cyriac, Jobin; Pradeep, Thalappil; Philip, Reji

doi:10.1016/j.cplett.2005.01.019

Cited by 31 publications

(24 citation statements)

References 19 publications

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“…2 we note that the nonlinear threshold (incident intensity where the transmission begins to decrease) is much smaller at ~10 GW/cm 2 for the Au 15 clusters as compared to ~10 4 GW/cm 2 obtained for 140 atom gold-clusters [13] using 100 fs pulses centered at 400 nm. Much smaller threshold intensities for optical limiting in femtosecond regime are known as compared to nanosecond regime [32].…”

Section: Discussionmentioning

confidence: 99%

“…These have been shown to exhibit several novel properties [10][11][12]. A few ultrafast studies on gold clusters have been reported in the literature [13][14][15]. On bigger gold clusters containing 140 atoms, Thomas et al, [13] observed optical limiting using nanosecond laser pulses at 532 nm, suggesting its origin to fifth order nonlinearity,  (5) with a three photon absorption coefficient of ~2.9x10 -15 cm 3 /W 2 .…”

Section: Introductionmentioning

confidence: 99%

“…A few ultrafast studies on gold clusters have been reported in the literature [13][14][15]. On bigger gold clusters containing 140 atoms, Thomas et al, [13] observed optical limiting using nanosecond laser pulses at 532 nm, suggesting its origin to fifth order nonlinearity,  (5) with a three photon absorption coefficient of ~2.9x10 -15 cm 3 /W 2 . Such a conclusion was drawn from fitting the z-scan data with equations incorporating two-and three-photon absorption coefficients.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Hence the observed nonlinearity in the present case is not pure 3PA, rather, it is an ''effective'' three-photon nonlinearity, arising from two-photon absorption (2PA) followed by excited state absorption. Such an effective v (5) nonlinearity v (3) : v (1) type has been observed in semiconductors [19] and metal nanoparticles [20] where the excited state absorption is brought about by free charge carriers. The observed nonlinearity of HA P is controlled by phosphate moiety since phosphate possesses delocalization of electron cloud.…”

Section: Nonlinear Optical Studiesmentioning

confidence: 97%

Synthesis and optical limiting studies of HAP and HAP@SiO2 core–shell nanoparticles

Rahulan

Vinitha

Ganesan

et al. 2011

J Mater Sci: Mater Electron

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We report the spectral and optical limiting properties of two kinds of HA P nanoparticles (pure HA P and HA P @SiO 2 core-shell nanoparticles) that were wetchemically prepared and coated with silica by means of Stober method. The size, framework substitution and silica coating formation of the resultant particles were confirmed by Transmission Electron Microscopy, X-ray diffraction, Fourier Transform Infrared Spectroscopy and Thermogravimetric analysis. The nonlinear optical limiting properties of HA P and HA P @SiO 2 nanoparticles suspended in ethylene glycol is studied at 532 nm using 5 ns Nd:YAG laser pulses. Observations indicate that effective threephoton absorption is found to be responsible for strong optical limiting characteristics in these nanoparticles and it is seen that the optical nonlinearity is enhanced in coreshell structures as compared with single counterparts. The nonlinear optical parameters calculated from the data show that these materials are efficient optical limiters.

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“…A two-photon induced excited state absorption, which is a sequential v (3) :v (1) process, also can result in nonlinear transmission curves that fit numerically to a three-photon (v (5) ) process. We have previously reported such nonlinearities in Au and Ag nanocluster systems [11,13]. Specifically, two-photon absorption at 532 nm due to interband transitions can generate free carriers in metal nanoclusters, which will sequentially absorb more photons.…”

Section: Resultsmentioning

confidence: 97%

Nonlinear optical properties of MeV and keV ion beam synthesized Ag nanoclusters

Joseph

Sandeep

Sekhar

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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Observation of a fifth order optical nonlinearity in 29kDa Au@alkanethiol clusters excited in the visible

Cited by 31 publications

References 19 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

Synthesis and optical limiting studies of HAP and HAP@SiO2 core–shell nanoparticles

Nonlinear optical properties of MeV and keV ion beam synthesized Ag nanoclusters

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