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Different approaches for fabrication of planar system with metal-enhanced singlet oxygen: (i) Direct contact between photosensitizer molecules and metal nanoparticles, (ii) Using dielectric (e.g., silica or polymer) film as spacer between the metal nanoparticles and photosensitizer molecules, and (iii) Using a dielectric matrix (e.g., polydimethylsiloxane) containing both metal nanoparticles and photosensitizer molecules
