https://scholars.lib.ntu.edu.tw/handle/123456789/442976
標題: | A Highly-Efficient Single Segment White Random Laser | 作者: | Haider, G. Hung-I Lin Kanchan Yadav Kun-Ching Shen Yu-Ming Liao Han-Wen Hu Pradip Kumar Roy Krishna Prasad Bera Kung-Hsuan Lin Hsien-Ming Lee Yit-Tsong Chen Fu-Rong Chen YANG-FANG CHEN |
公開日期: | 2018 | 卷: | 3 | 期: | 1 | 起(迄)頁: | 11847-11859 | 來源出版物: | ACS Nano | 摘要: | Production of multicolor or multiple wavelength lasers over the full visible-color spectrum from a single chip device has widespread applications, such as superbright solid-state lighting, color laser displays, light-based version of Wi-Fi (Li-Fi), and bioimaging, etc. However, designing such lasing devices remains a challenging issue owing to the material requirements for producing multicolor emissions and sophisticated design for producing laser action. Here we demonstrate a simple design and highly efficient single segment white random laser based on solution-processed NaYF 4 :Yb/Er/Tm@NaYF 4 :Eu core-shell nanoparticles assisted by Au/MoO 3 multilayer hyperbolic meta-materials. The multicolor lasing emitted from core-shell nanoparticles covering the red, green, and blue, simultaneously, can be greatly enhanced by the high photonic density of states with a suitable design of hyperbolic meta-materials, which enables decreasing the energy consumption of photon propagation. As a result, the energy upconversion emission is enhanced by ∼50 times with a drastic reduction of the lasing threshold. The multiple scatterings arising from the inherent nature of the disordered nanoparticle matrix provide a convenient way for the formation of closed feedback loops, which is beneficial for the coherent laser action. The experimental results were supported by the electromagnetic simulations derived from the finite-difference time-domain (FDTD) method. The approach shown here can greatly simplify the design of laser structures with color-tunable emissions, which can be extended to many other material systems. Together with the characteristics of angle free laser action, our device provides a promising solution toward the realization of many laser-based practical applications. Copyright © 2018 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/442976 | DOI: | 10.1021/acsnano.8b03035 | SDG/關鍵字: | Coherent scattering; Color; Core shell nanoparticles; Display devices; Electromagnetic simulation; Energy utilization; Laser beams; Metamaterials; Shells (structures); Solid state lasers; Time domain analysis; Material requirements; Multi-color emissions; Multiple wavelengths; Photonic density of state; Random lasers; Single segments; Solid state lighting; Up conversion; Finite difference time domain method |
顯示於: | 物理學系 |
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