Ultraviolet and visible random lasers assisted by diatom frustules

Area of Science:

• Photonics and Materials Science
• Biophotonics
• Nanotechnology

Background:

• Random lasers offer unique properties for advanced optical applications.
• Diatom frustules, with their intricate porous structures, present potential as novel optical materials.
• Low optical loss materials are crucial for efficient laser operation.

Purpose of the Study:

• To demonstrate random laser actions using bio-inspired diatom frustules as scattering centers.
• To investigate the potential of diatom structures for wide spectrum random lasers.
• To explore eco-friendly biophotonics devices with high performance.

Main Methods:

• Fabrication of composites using diatom frustules with Gallium Nitride (GaN) film and Rhodamine 6G (Rh6G) dye.
• Utilizing diatom frustules as scattering centers in random laser setups.
• Characterization of laser actions in ultraviolet and visible spectral regions.

Main Results:

• Achieved random laser actions in both ultraviolet and visible regions using diatom frustule composites.
• Observed very sharp laser peaks, indicating efficient optical confinement.
• Correlated optical cavity length with the average size of diatom frustules, confirming their role in confinement.

Conclusions:

• Diatom frustules serve as effective scattering centers for wide spectrum random lasers.
• The bio-inspired approach offers a pathway towards high-performance, eco-friendly biophotonics.
• This proof-of-concept study opens avenues for novel photonic devices with broad spectral response.