Nonlinear optical response of platinum nanoparticles and platinum ions embedded in sapphire

Abstract

We report on the fabrication of sapphire samples containing platinum nanoparticles (Pt-NPs) and platinum ions (Pt-ions) and the investigation of their third-order nonlinear (NL) optical properties. The presence of Pt-NPs was confirmed by electronic microscopy and by the linear absorption spectrum that shows a localized surface plasmon band centered at 290 nm. A sample without NPs but containing Pt-ions was also studied. The absorptive and refractive contributions to the nonlinearity were studied using the z-scan technique with 100 fs pulses at 800nm. The experiments revealed a NL refractive index, +3.8×10^-13 < n₂ < +1.3×10^-12cm²/W and NL absorption coefficient (β < 9.3 cm/GW). The results show enhancement of about five orders of magnitude with respect to the NL refractive index of sapphire.

High-order optical nonlinearities in plasmonic nanocomposites—a review

“…Many publications related to the basic characteristics of metal nanocolloids and solidstate metal composites appeared in the past years [65][66][67][68][69][70][71][72][73][74][75][76][77][78]. In the majority of the experiments the authors focused on the third-order properties of the materials.…”

Plasmonic Nanoparticles in Dielectrics Synthesized by Ion Beams: Optical Properties and Photonic Applications

“…According to the sign of n 2 , the nonlinear refraction can be classified as self‐defocusing and self‐focusing. [ 27,157–159 ] With the increase of excitation intensity, the transmittance will increase (decrease) at first and decrease (increase) to the original intensity finally for self‐defocusing (self‐focusing), which behaves like a concave (convex) lens. As displayed in Figure 7b, typical self‐defocusing phenomenon (peak‐valley) is observed under the excitation at 532 nm.…”

“…In photonics, the synergistic effect between NPs and functional dielectric crystals shows significant potential for material modification with unprecedented optical phenomena, e.g., electron transfer mechanism, high‐order nonlinearity enhancement, modulation, and so on. [ 6,8,25,27 ] To promote the interaction effect between NPs and dielectrics, some well‐developed techniques have been proposed to embed NPs into the matrix for designed nanocomposite systems, such as ion beam implantation/irradiation, ion exchange, and femtosecond laser processing. [ 27–29 ]…”

“…[ 6,8,25,27 ] To promote the interaction effect between NPs and dielectrics, some well‐developed techniques have been proposed to embed NPs into the matrix for designed nanocomposite systems, such as ion beam implantation/irradiation, ion exchange, and femtosecond laser processing. [ 27–29 ]…”

Nonlinear Mechanooptical Transmittance Controlled by a Rotating TiO2 Thin Solid Film with Embedded Bimetallic Au-Pt Nanoparticles

“…The incorporation of Platinum NPs in dielectric substrates with high refractive index pointed out the possibility of employing nanocomposites for designing plasmonic schemes [13]. Nevertheless, third-order nonlinear optical properties exhibited by metallic NPs seem to be strongly modulated by different parameters that depend on resonance and irradiation conditions such as pulse duration and wavelength [14]. In this direction, it has been reported that bimetallic NPs may be able to distinctively enhance the nonlinear optical response of nanosystems [15].…”