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Enhanced random laser by metal surface-plasmon channel waveguide.

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Area of Science:

Photonics and Optics
Materials Science
Nanotechnology

Background:

Random lasers (RL) utilize strong scattering in disordered gain media, differing from conventional lasers.
Metal surface plasmon (SP) waveguides offer unique light confinement properties.

Purpose of the Study:

To investigate random lasing in a 1D metal SP waveguide enhanced by gold-plated silicon pyramids.
To explore methods for improving RL performance and enabling subwavelength optical applications.

Main Methods:

Fabrication of gold-plated self-formed silicon pyramids on a 1D metal SP waveguide.
Experimental investigation of random lasing characteristics.
Finite-difference time-domain (FDTD) simulations to analyze field enhancement.

Main Results:

Au-coated Si spiky tips dramatically enhanced RL emission intensity.
Significant reduction in the RL threshold was observed.
1D metal SP channel waveguides confined light with a small divergence angle.
FDTD simulations attributed enhancement to localized surface plasmon (LSP) fields.

Conclusions:

The LSP field near spiky tips enhances light-matter interaction, benefiting lasing at small scales.
This study presents a feasible method for applying RL in subwavelength optical elements.
The developed approach offers improved performance for random laser devices.