Controlling the lasing modes in random lasers operating in the Anderson localization regime

Area of Science:

• Optics and Photonics
• Materials Science
• Condensed Matter Physics

Background:

• Random lasers offer simpler, cost-effective alternatives to traditional Fabry-Pérot lasers.
• Controlling lasing modes in random lasers is challenging due to chaotic fluctuations and instability.

Purpose of the Study:

• To investigate the use of random indium phosphide nanowire (InP NW) arrays operating in the Anderson localization regime for stable random lasing.
• To demonstrate control over lasing properties by modifying the design parameters of InP NW arrays.

Main Methods:

• Fabrication of random InP nanowire arrays with varying design parameters.
• Characterization of lasing modes, including number of modes, wavelengths, and threshold.
• Analysis of Anderson localization effects in the nanowire arrays.

Main Results:

• Stable lasing modes were achieved in the Anderson localization regime.
• Lasing properties such as mode number, wavelength, and threshold were successfully controlled.
• Key design parameters influencing lasing properties were identified: filling factor, NW dimensions, randomness, and array size.

Conclusions:

• Indium phosphide nanowire arrays provide a viable platform for developing stable and controllable random lasers.
• The study demonstrates a method to engineer random laser properties through precise control of material and structural design parameters.