Strong Enhancement of Two-Photon Absorption and Emergence of Unusual Extinction Saturation in Silver Sulfide Quantum Dots Integrated with Gold and Silica Nanostructures DOI Creative Commons
Marta Gordel, Radosław Kołkowski, Marcin Nyk

и другие.

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер 17(19), С. 28484 - 28494

Опубликована: Май 3, 2025

Hybrid nanosystems, such as those combining plasmonic, dielectric, and quantum-confined nanostructures, have long been of interest for enhancing tailoring diverse light-matter interactions. Here, we present a series hybrid nanomaterials exhibiting strongly enhanced nonlinear optical (NLO) properties, fabricated by silver sulfide quantum dots (Ag2S QDs) with silica gold nanostructures. We studied their NLO properties (two-photon absorption saturable absorption) in colloidal solutions over wide spectral range (500-1600 nm) using the femtosecond Z-scan technique. Embedding Ag2S QDs into nanospheres gives rise to remarkable enhancement two-photon (up factor 16 increase merit σ2/M compared bare QDs), whereas covering QD-doped nanoparticles or attaching surface nanoshells (NSs) leads even further 73-fold σ2/M), accompanied competing effect absorption. Furthermore, case spheres covered continuous layer, observe previously unreported saturation extinction near-infrared region that follows an unusual intensity dependence, suggesting involvement pumping mechanism. In addition experimental studies, performed numerical simulations, revealing plasmonic origin observed dependences underlying mechanisms involving local field and, possibly, also coupling between plasmon modes QD excitons, giving double peak σ2 spectrum. Our findings demonstrate unique potential quantum-confined, dielectric components.

Язык: Английский

Strong Enhancement of Two-Photon Absorption and Emergence of Unusual Extinction Saturation in Silver Sulfide Quantum Dots Integrated with Gold and Silica Nanostructures DOI Creative Commons
Marta Gordel, Radosław Kołkowski, Marcin Nyk

и другие.

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер 17(19), С. 28484 - 28494

Опубликована: Май 3, 2025

Hybrid nanosystems, such as those combining plasmonic, dielectric, and quantum-confined nanostructures, have long been of interest for enhancing tailoring diverse light-matter interactions. Here, we present a series hybrid nanomaterials exhibiting strongly enhanced nonlinear optical (NLO) properties, fabricated by silver sulfide quantum dots (Ag2S QDs) with silica gold nanostructures. We studied their NLO properties (two-photon absorption saturable absorption) in colloidal solutions over wide spectral range (500-1600 nm) using the femtosecond Z-scan technique. Embedding Ag2S QDs into nanospheres gives rise to remarkable enhancement two-photon (up factor 16 increase merit σ2/M compared bare QDs), whereas covering QD-doped nanoparticles or attaching surface nanoshells (NSs) leads even further 73-fold σ2/M), accompanied competing effect absorption. Furthermore, case spheres covered continuous layer, observe previously unreported saturation extinction near-infrared region that follows an unusual intensity dependence, suggesting involvement pumping mechanism. In addition experimental studies, performed numerical simulations, revealing plasmonic origin observed dependences underlying mechanisms involving local field and, possibly, also coupling between plasmon modes QD excitons, giving double peak σ2 spectrum. Our findings demonstrate unique potential quantum-confined, dielectric components.

Язык: Английский

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