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Researchers developed a tunable random laser on a flexible substrate. Bending the substrate controllably shifts the lasing wavelength, offering new applications for random lasers.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Random lasers offer unique light emission properties.
  • Tunable lasing is crucial for advanced photonic applications.
  • Flexible optoelectronic devices require adaptable laser sources.

Purpose of the Study:

  • To demonstrate a flexible random laser with tunable emission.
  • To investigate the mechanism of wavelength tunability via mechanical strain.
  • To explore the potential applications of strain-tunable random lasers.

Main Methods:

  • Fabrication of a flexible random laser on a polyethylene terephthalate (PET) substrate.
  • Utilizing Rhodamine 6G (R6G) as the gain medium and silver nanoprisms (Ag NPRs) for localized surface plasmon resonance (LSP).
  • Employing dark-field microscopy to analyze the scattering spectra of Ag NPRs under varying bending strains.

Main Results:

  • Achieved tunable random lasing emissions through resonance coupling between R6G and Ag NPRs.
  • Demonstrated monolithic blue-shifting of the lasing wavelength with increasing bending strain on the PET substrate.
  • Observed a maximum wavelength shift of approximately 15 nm at 50% bending strain, with high repeatability and reversibility.

Conclusions:

  • The study successfully demonstrates a flexible, strain-tunable random laser.
  • The tunability is attributed to the modulation of localized surface plasmon resonance by mechanical strain.
  • This flexible random laser technology is expected to open new avenues for applications in tunable photonic devices.