Abstract
A strong influence of mechanical action in nonlinear optical transmittance experiments with bimetallic nanoparticles integrated by gold and platinum was observed. The nanostructured samples were synthesized by a sol-gel method and contained in an ethanol suspension. UV-VIS spectroscopy evaluations, Transmission electron microscopy studies and input-output laser experiments were characterized. A two-photon absorption effect was induced by nanosecond pulses at 532 nm wavelength with an important contribution from the plasmonic response of the nanomaterials. All-optical identification of acoustical waves was remarkably improved by optical nonlinearities. High sensitivity for instrumentation of mechano-optical signals sensing particular fluids was demonstrated by using a variable carbon dioxide incorporation to the system.
Highlights
The success of noble metal nanoparticles (NPs) has been empowered by their fascinating improved properties in comparison with bulk materials [1]
platinum NPs (Pt NPs) may give rise to new photo-thermal agents [17] that may be assisted by biostability and adhesion properties that are strongly attractive for nano/micro-engineered systems for neurological diagnostic [18]
The results revealed that nonlinear optical absorption effects of the Au-Pt NPs are at least three orders of magnitude higher than the magnitudes that corresponded to ethanol or quartz
Summary
The success of noble metal nanoparticles (NPs) has been empowered by their fascinating improved properties in comparison with bulk materials [1]. Is effective the participation of third-order optical nonlinearities of nanostructured samples for designing photo-thermal processes [30]. It has been pointed out a large enhancement in the performance of optical systems by recent advances in plasmonics [31,32]. An infinite number of new configurations with different nanomaterials can be considered for nanophotonic and acousto-optical signals processing [33,34] In this direction, this paper has been devoted to study acousto-optic and nonlinear optical properties exhibited by Au-Pt nanoparticles with plasmonic properties associated with their bimetallic nature. Potential applications for instrumentation of mecano-optical signals and gas sensing were experimentally explored
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