journal article·2025

Graphitic carbon nitride nanosheets as scatterers for random laser action

Pablo I. R. Pincheira, Igor M. Gonçalves, Olga Rubilar, Ana Obreque, Edward Hermosilla, Alyson J. A. Carvalho, Leonardo de S. Menezes

Nanoscale· Volume 17· Issue 35
Publisher page

Abstract

We demonstrate random laser (RL) emission from rhodamine 610 using graphitic carbon nitride (g-C3N4) nanosheets synthesized using a thermal polymerization method as scatterers in a liquid suspension to provide feedback for the RL emission. To characterize RL action and its threshold value, we observed replica symmetry breaking that leads to a transition from a photonic paramagnet to a photonic spin glass for four concentrations of g-C3N4. Additionally, we applied a fast Fourier transform to the RL spectra to gain insights into the photon optical path lengths, which aids in evaluating the feedback mechanism. The photonic disorder introduced by the g-C3N4 nanosheets creates multiple scattering paths of different natures. An important aspect revealed by our experimental results is the existence of coherent feedback in the system. At the same time, localized optical modes are generated within each nanosheet due to intrinsic structural defects and surface states, providing a coherent feedback mechanism.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Random lasers and scattering media · Advanced Optical Imaging Technologies · Surface Roughness and Optical Measurements

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departamento de Ciencias Fisicas, Universidad de La Frontera, Avenida Francisco Salazar 01145, Casilla 54-D, Temuco, 4811230, de La Araucanía, Chile

Departamento de Física, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universitária, Recife, PE 50670-901, Brazil

Departamento de Ingeniería Química, Universidad de La Frontera, Avenida Francisco Salazar 01145, Casilla 54-D, Temuco, 4811230, de La Araucanía, Chile

Centro de excelencia en Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA), Universidad de La Frontera, Avenida Francisco Salazar 01145, Casilla 54-D, Temuco, 4811230, de La Araucanía, Chile

Departamento de Física-CCT-UEPB, 58.109-790, Campina Grande, PB, Brazil

Chair in Hybrid Nanosystems, Faculty of Physics, Ludwig-Maximilians-University München, Königinstrasse 10, 3. OG, 80539 Munich, Germany

Funding

Conselho Nacional de Desenvolvimento Científico e Tecnológico · Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco · Coordenação de Aperfeiçoamento de Pessoal de Nível Superior · Fondo Nacional de Desarrollo Científico y Tecnológico · Ludwig-Maximilians-Universität München

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