A Highly-Efficient Single Segment White Random Laser

0499173 - ÚFCH JH 2019 RIV US eng J - Journal Article
Haider, Golam - Lin, H. I. - Yadav, K. - Shen, K. C. - Liao, Y.-Y. - Hu, H. W. - Roy, P. K. - Bera, K. P. - Lin, K. H. - Lee, H. M. - Chen, Y. T. - Chen, F. R. - Chen, Y. F.
A Highly-Efficient Single Segment White Random Laser.
ACS Nano. Roč. 12, č. 12 (2018), s. 11847-11859. ISSN 1936-0851. E-ISSN 1936-086X
R&D Projects: GA MŠMT(CZ) LTC18039; GA MŠMT(CZ) EF16_027/0008355
Institutional support: RVO:61388955
Keywords : high photonic density of states * hyperbolic meta-materials * single segment multicolor laser * up-conversion * white random laser
OECD category: Physical chemistry
Impact factor: 13.903, year: 2018

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 NaYF4:Yb/Er/Tm@NaYF4:Eu core-shell nanoparticles assisted by Au/MoO3 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.
Permanent Link: http://hdl.handle.net/11104/0291430