Random stack of resonant dielectric layers as a laser system

Area of Science:

• Photonics
• Condensed Matter Physics
• Materials Science

Background:

• Random lasers offer unique light emission properties.
• Controlling light propagation in disordered media is challenging.
• Dielectric resonators can create frequency-dependent optical properties.

Purpose of the Study:

• To propose and investigate a novel random laser system using resonant dielectric layers.
• To explore the impact of engineered band structures on laser performance.
• To demonstrate a method for significantly reducing the random laser threshold.

Main Methods:

• Fabrication of a random stack of resonant dielectric layers.
• Characterization of light propagation and band structure within the system.
• Analysis of optical gain positioning relative to the system's passband and stop band.

Main Results:

• The system exhibits frequency-dependent light propagation due to Fabry-Perot resonances.
• Strategic placement of optical gain within the stop band dramatically reduces the laser threshold.
• Performance is significantly enhanced compared to completely disordered systems.

Conclusions:

• Resonant dielectric layer stacks provide a promising platform for random laser studies.
• Engineered band structures are crucial for optimizing random laser efficiency.
• This approach offers a pathway to more efficient and controllable random laser devices.