Journal
OPTICS AND LASER TECHNOLOGY
Volume 147, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2021.107666
Keywords
Laser ablation in liquid; Nanosecond laser pulses; Hybrid Au@Si microspheres; Nonlinear optics; Broadband photoluminescence
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Funding
- RFBR [20-32-70056, 20-52-04005, Phi21PM-105]
- BRFBR [20-32-70056, 20-52-04005, Phi21PM-105]
- Ministry of Science and Higher Education of the Russian Federation [MK-4321.2021.1.2]
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In this study, a one-step synthesis of hybrid Au@Si nanomaterial with unique composition and morphology was achieved using scalable and high-performing methods, enabling the integration of optical and all-dielectric concepts. The resulting nanomaterial exhibits the capability to efficiently absorb and enhance incident radiation across a broad spectral range, showing promise for plasmon-mediated optical effects amplification.
Hybrid nanomaterials with chemical composition integrating light-emitting low-loss semiconductors with plasmon-active metals are highly demanded for optoelectronics, nanophotonics and sensors. However, there is a still lack for high-performing and inexpensive methods allowing facile integration of plasmonic and all-dielectric concepts within unified practically relevant nanostructures and ensuring their production at gram-per-hour yield. Here, we report one-step synthesis of hybrid Au@Si nanomaterial with unique composition and morphology via scalable and high-performing pulsed laser irradiation of isopropanol solution containing commercial Si micropowder and AuCl4- ions. The resulting hybrid nanomaterial represents sub-micron nanocrystalline Si grains embedded into Au surrounding forming micro-spheres (MSs) additionally decorated with Au nanoparticles. Such unique structure and chemical composition of the Au@Si MSs permits to efficiently absorb and enhance incident radiation within rather broad spectral range spanning from visible to near-IR making the nanomaterial promising for plasmon-mediated amplification of linear and nonlinear optical effects. Efficient generation of broadband hot-carrier-induced photoluminescence of nanocrystalline Si grains upon IR femtosecond-laser sub-nJ pump proves the produced nanomaterial as advanced nanophotonic platform for nano-spectroscopy and sensing.
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