Graphitic carbon nitride nanosheets as scatterers for random laser action

Area of Science:

• Materials Science
• Optics
• Condensed Matter Physics

Background:

• Random lasers (RLs) offer potential for low-cost coherent light sources.
• Developing efficient scattering media is crucial for achieving RL emission.
• Graphitic carbon nitride (g-C₃N₄) is a promising material for photonic applications.

Purpose of the Study:

• To demonstrate random laser emission using graphitic carbon nitride (g-C₃N₄) nanosheets.
• To investigate the role of g-C₃N₄ nanosheets as scattering centers in providing feedback for RL.
• To characterize the transition from photonic paramagnet to photonic spin glass and analyze feedback mechanisms.

Main Methods:

• Synthesis of g-C₃N₄ nanosheets via thermal polymerization.
• Preparation of liquid suspensions with varying g-C₃N₄ concentrations.
• Characterization of RL emission, including threshold determination.
• Analysis of RL spectra using Fast Fourier Transform (FFT) to probe optical path lengths.

Main Results:

• Successful demonstration of random laser emission from rhodamine 610 using g-C₃N₄ nanosheets.
• Observation of replica symmetry breaking, indicating a transition to a photonic spin glass state.
• Identification of coherent feedback and localized optical modes within the g-C₃N₄ nanosheets.
• FFT analysis provided insights into photon scattering and feedback mechanisms.

Conclusions:

• g-C₃N₄ nanosheets effectively serve as scattering gain media for random laser action.
• The observed phenomena confirm the presence of coherent feedback essential for RL.
• The study highlights the potential of engineered nanomaterials for developing novel laser systems.