Nonlinear optical properties of Au nanoclusters encapsulated into hybrid block copolymer micelles

Iliopoulos, Konstantinos; Athanasiou, Dimitrios; Meristoudi, Anastasia; Vainos, N.A.; Pispas, Stergios; Couris, Stelios

doi:10.1002/pssa.200780179

Cited by 8 publications

(9 citation statements)

References 9 publications

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“…63,64 However, some studies have reported switching from SA to RSA 71,81 and some others only RSA. 67,82 Similarly for Ag NPs, both switching from SA to RSA 69,74 and only RSA have been reported. 34 The wealth of all these different NLO behaviors can be explained by considering the complex interplay of several factors, such as the size, the dielectric environment, 83 the presence of capping agents and/ or stabilizers, 84−86 the colloidal state and the laser intensity.…”

Section: Discussionmentioning

confidence: 96%

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

et al. 2015

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The synthesis of variable composition Au x Ag (1−x) alloyed nanoparticles prepared by laser ablation in water is reported. The nanoalloys exhibited a single characteristic surface plasmon resonance peak, whose spectral position was lying between the surface plasmon resonance peaks of neat Ag and Au nanoparticles, at about 400 and 530 nm respectively, depending directly on the composition of the alloyed nanoparticles. The nonlinear optical response of the nanoalloys was studied in details under 532 nm (visible) 35 ps and 4 ns laser excitation and it was found to be significant and greatly influenced by the position of the plasmonic band relative to the laser excitation wavelength. In this respect, increase of the Au molar fraction resulted in shifting of the nanoalloy plasmon band toward the location of the plasmon band of neat Au nanoparticles, i.e., at about 530 nm, closer to the laser excitation wavelength, hence causing more efficient resonance enhancement of the nonlinear optical response. Moreover, the nanoalloys were found to exhibit strong saturable absorption behavior when excited by ps or ns pulses, in the latter case this behavior changing to reverse saturable absorption at high laser intensity. The origin, the magnitude and the sign of the observed optical nonlinearities of the alloyed nanoparticles are explained and discussed in terms of the hot-electron and the interband contributions taking place under laser excitation in such nanostructures. The possibility of controlling the magnitude and the sign of the nonlinear optical response of Au x Ag (1−x) nanoalloys through their composition provides an attractive and efficient way to tailor the optical nonlinearities of noble metal nanoalloys, making them very useful for various emerging photonic, biophotonic, and optoelectronic applications.

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Section: Discussionmentioning

confidence: 96%

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

et al. 2015

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“…Later, the NLO response of Au NPs suspensions encapsulated into hybrid block copolymer micelles was investigated by using Z -scan technique, with 35 ps pulse at 532 nm . The block copolymer used for the encapsulation of the Au NPs was poly(isoprene- b -acrylic acid).…”

Section: Inorganic Materialsmentioning

confidence: 99%

“…525 Later, the NLO response of Au NPs suspensions encapsulated into hybrid block copolymer micelles was investigated by using Z-scan technique, with 35 ps pulse at 532 nm. 526 The block copolymer used for the encapsulation of the Au NPs was poly(isoprene-b-acrylic acid). All dispersions were exhibiting strong OL action, and real and imaginary parts of the third-order nonlinear susceptibility χ (3) of the dispersions were determined.…”

Section: Metal Nanoparticlesmentioning

confidence: 99%

“…It was found positive nonlinear absorption and negative nonlinear refraction for the Au colloidal suspensions. In particular, it was reported a nonlinear absorption coefficient of 9.4 × 10 −12 cm/W, which is in agreement with the value determined by Iliopoulos et al 526 for the Au nanoclusters, and an opposite sign nonlinear refraction. However, because no details were given on the size of Au NPs and/or any datum of UV−vis absorption spectrum, it is difficult to proceed to a more direct comparison.…”

Section: Metal Nanoparticlesmentioning

confidence: 99%

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Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.

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“…Recent efforts have been done on the nonlinear optical (NLO) properties determination of metal clusters with the number of metal atoms higher than 10 [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], while the only reported nonlinear optical properties of gold cluster with a number of metal atoms lower than 10 has been for the gold nanocluster Au 6 (GSH) 2 (MPA) 2 having six gold atoms [23]. We herein present density functional theory (DFT) calculations of the nonlinear optical (NLO) properties of gasphase gold clusters Au n (n=2-10) as a first approach towards the theoretical exploration of their NLO properties.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Effects on Neutral Gold Clusters Au<sub>2-10</sub>: A First-Principles Theoretical Survey of the First- and Second-Order Hyperpolarizabilities

Sani¹

2021

SJC

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Herein we report the density functional theory (DFT) calculations of nonlinear optical (NLO) properties of neutral gold clusters Au n (n=2-10) applying long-range corrected LC-M06L functional and Los-Alamos National Laboratory double-ζ polarized basis set. The effects of the incident frequency on the first and second-order hyperpolarizability together with the influence of the external electric field on the frontier orbitals of neutral gold clusters are investigated. It is found that the application of external electric field can increase or decrease the gap energy of neutral gold clusters depending on the direction and magnitude of the applied field. More importantly, by correctly controlling the direction and magnitude of the external electric field, reactive gold clusters having low gap energies can be achieved. Furthermore, the external electric field has more important effect on the virtual orbitals of gold hexamer and decreases the energy of these orbitals along the directions parallel to the molecular plane, resulting in low-energy excitations. The low-energy excitations are expected to play important role in the high second-order hyperpolarizability and better response to the applied field. The third-order nonlinear (NLO) properties of gold hexamer are also strongly affected by the frequency of the incident light and thus can be tuned using the incident frequency for applications. The present work may propose new strategies for enhancing the nonlinear optical response of neutral gold clusters.

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Nonlinear optical properties of Au nanoclusters encapsulated into hybrid block copolymer micelles

Cited by 8 publications

References 9 publications

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

Electric Field Effects on Neutral Gold Clusters Au<sub>2-10</sub>: A First-Principles Theoretical Survey of the First- and Second-Order Hyperpolarizabilities

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Nonlinear optical properties of Au nanoclusters encapsulated into hybrid block copolymer micelles

Cited by 8 publications

References 9 publications

Effect of the Composition on the Nonlinear Optical Response of AuxAg1–x Nano-Alloys

Effect of the Composition on the Nonlinear Optical Response of AuxAg1–x Nano-Alloys

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

Electric Field Effects on Neutral Gold Clusters Au&lt;sub&gt;2-10&lt;/sub&gt;: A First-Principles Theoretical Survey of the First- and Second-Order Hyperpolarizabilities

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Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

Electric Field Effects on Neutral Gold Clusters Au<sub>2-10</sub>: A First-Principles Theoretical Survey of the First- and Second-Order Hyperpolarizabilities