Microchip Random Laser based on a disordered TiO2-nanomembranes arrangement.

Area of Science:

• Photonics and Materials Science
• Nanotechnology and Optics

Background:

• Random lasers offer unique properties but often lack coherent feedback.
• Titanium dioxide nanomembranes (TiO(2)-NM) are emerging as versatile building blocks for micro- and nano-electromechanical systems (MEMS/NEMS).

Purpose of the Study:

• To develop a novel scheme for achieving coherent random lasing.
• To investigate the use of TiO(2)-NM as scatterers for laser feedback.
• To explore the potential for new active/passive photonic devices.

Main Methods:

• Fabrication of a chip with a polymer film doped with Rhodamine 6G.
• Integration of butterfly-like TiO(2)-NM as scatterers on a glass substrate.
• Characterization of laser emission properties, focusing on feedback mechanisms.

Main Results:

• Successful generation of coherent random lasing.
• Confirmation of multiple scattering by TiO(2)-NM as the primary feedback mechanism.
• Observation of the characteristic above-threshold multiple spikes signature for random laser emission.

Conclusions:

• The developed scheme effectively produces coherent random lasing.
• TiO(2)-NM serve as efficient scatterers, enabling feedback for laser action.
• This work paves the way for novel integrated photonic devices utilizing nanomembranes.