Fig. 5.
FDTD calculations for field enhancements around a silver sphere. (A) Zoomed image of 10 nm above the surface of the silver sphere maximum field intensity at z = 10 nm to correlate increased field enhancements in proximity to sphere surface with increased singlet oxygen generation. (B) |E|2 field intensity (incident plus scatter) distribution in the xz plane around a 100-nm silver sphere due to an incident TFSF wave propagating along the y axis and polarized along the z axis with a wavelength of 365 nm, which corresponds to the maximum wavelength of the UV source used to excite RB and generate singlet oxygen. (C) Distance dependence relationship between electric field enhancements and singlet oxygen on 100-nm Ag nanoparticles. (D) Distance dependence of singlet oxygen enhancement factor of RB on SiFs. The top layer is mixed solution of green sensor and RB. The SiOx layer was deposited by using thermal vapor deposition. Ag, silver island films; EF, enhancement factor.