Header menu link for other important links
X
Femtosecond laser-pumped plasmonically enhanced near-infrared random laser based on engineered scatterers
Venkata Siva Gummaluri, Radhika V. Nair, ,
Published in OSA - The Optical Society
2017
PMID: 29216166
Volume: 42
   
Issue: 23
Pages: 5002 - 5005
Abstract
In this Letter, we report on the design, fabrication, and implementation of a novel plasmon-mode-driven low-threshold near-infrared (NIR) random laser (RL) in the 850–900 nm range based on plasmonic ZnS@Au core-shell scatterers. Plasmon modes in the NIR region are used for nanoscale scatterer engineering of ZnS@Au core-shell particles to enhance scattering, as against pristine ZnS. This plasmonic scattering enhancement coupled with femtosec-ond (fs) laser pumping is shown to cause a three-fold lasing threshold reduction from 325 μJ∕cm2 to 100 μJ∕cm2 and a mode Q-factor enhancement from 200 to 540 for ZnS@Au-based RL, as compared to pristine ZnS-based RL. Local field enhancement due to plasmonic ZnS@Au scatterers, as evidenced in the finite-difference time-domain simulation, further adds to this enhancement. This work demonstrates a novel scheme of plasmonic mode coupling in the NIR region and fs excitation in a random laser photonic system, overcoming the inherent deficiencies of weak absorption of gain media and poor scattering cross sections of dielectric scatterers for random lasing in the NIR spectrum. © 2017 Optical Society of America.
About the journal
JournalData powered by TypesetOptics Letters
PublisherData powered by TypesetOSA - The Optical Society
ISSN01469592
Impact Factor1.230
Open AccessNo
Citation Styleunsrt
Sherpa RoMEO Archiving PolicyGreen
Concepts (20)
  •  related image
    Absorption spectroscopy
  •  related image
    Electric excitation
  •  related image
    Finite difference time domain method
  •  related image
    Laser beams
  •  related image
    Laser excitation
  •  related image
    Plasmons
  •  related image
    PUMPING (LASER)
  •  related image
    Q factor measurement
  •  related image
    Shells (structures)
  •  related image
    Time domain analysis
  •  related image
    Zinc sulfide
  •  related image
    CORE SHELL PARTICLES
  •  related image
    DIELECTRIC SCATTERERS
  •  related image
    FINITE DIFFERENCE TIME DOMAIN SIMULATIONS
  •  related image
    Lasing threshold
  •  related image
    Local field enhancement
  •  related image
    PHOTONIC SYSTEMS
  •  related image
    PLASMONIC MODES
  •  related image
    SCATTERING CROSS SECTION
  •  related image
    Infrared devices