Metal–Dielectric Core–Shell Nanoparticles: Advanced Plasmonic Architectures Towards Multiple Control of Random Lasers

Abstract

Random lasing properties of dye solutions suspended with gold–silica core–shell nanoparticles are investigated. The core–shell architecture allows adjustment of plasmon coupling strength between metal and optical gain media by varying the thickness of dielectric shell. Consequently, multiple aspects of random lasers can be controlled, such as mode interactions, lasing spikiness, and pump threshold. The results show that bare gold nanoparticles give rise to the most profound lasing spikes that are evenly separated in resonant wavelength. The lowest threshold is observed when the shell thickness is ~14.6 nm. The experimental observations are interpreted in terms of resonant coupling between metal nanoparticles and fluorophores, localization of pump light and lasing modes at the surface of metal, as well as plasmonic modifications of absorption and pump rates of fluorophores. The results suggest that metal–dielectric core–shell nanostructures can serve as promising candidates towards development of well‐controlled random lasers.

A RGB random laser on an optical fiber facet

“…[1][2][3][4][5][6][7][8] The lasing threshold of a plasmonic random laser is much lower than that of a conventional random laser because of its large scattering cross-section and the localized surface plasmon resonance of the metal nanoparticles (NPs) used in the structure. [9][10][11][12][13] Additionally, red-greenblue (RGB) plasmonic random lasers have been studied as potential multicolor output devices. [14][15][16] Recently, the use of a combination of random lasers and optical bers has been shown to improve the miniaturization of laser sources.…”

Hybrid Multilayered Plasmonic Nanostars for Coherent Random Lasing

“…Similar correlations between the lasing thresholds and the field enhancement were reported also by others. 40 …”

Металлодиэлектрические Наночастицы Типа Ядро–оболочка

“…Такие частицы в современной научной терминологии получили название частиц типа ядро-оболочка. Исследовательский интерес к теоретическому изучению металлодиэлектрических наночастиц типа ядрооболочка подтверждается большим количеством публикаций на эту тему в научных изданиях [1][2][3][4][5][6][7].…”