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Quasi-BIC metasurfaces enable rapid, localized singlet-oxygen generation.

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Area of Science:

  • Photonics
  • Materials Science
  • Photochemistry

Background:

  • Bound states in the continuum (BIC) offer efficient light confinement.
  • Hot carriers are crucial for photocatalysis and photodynamic applications.
  • Interfacial charge transfer in metal-semiconductor nanostructures is key for energy conversion.

Purpose of the Study:

  • To engineer metasurfaces for enhanced hot-carrier generation and singlet oxygen (¹O₂) production.
  • To leverage BIC resonance for efficient photon-to-chemical conversion.
  • To demonstrate wavelength- and position-selective photodynamic effects.

Main Methods:

  • Fabrication of Au-TiO₂ metasurfaces with coupled q-BIC resonance.
  • Utilizing photonic engineering to increase optical absorption and reduce electron-hole recombination.
  • Investigating hot-carrier-mediated ¹O₂ generation under continuous-wave excitation.

Main Results:

  • Achieved a six-order-of-magnitude increase in local ¹O₂ concentration.
  • Demonstrated rapid molar-level ¹O₂ concentration within seconds.
  • Enabled selective phototoxicity by tuning structural asymmetry and excitation wavelength.

Conclusions:

  • BIC-engineered metasurfaces provide a general platform for efficient photon-to-chemical conversion.
  • The approach decouples strong absorption from noble metal usage, prolonging carrier lifetimes.
  • Offers significant potential for photodynamic therapy, selective oxidation, and microreactor applications.