TY - JOUR
T1 - Nonlinear microscopy of localized field enhancements in fractal shaped periodic metal nanostructures
AU - Beermann, I.
AU - Evlyukhin, A.
AU - Boltasseva, Alexandra
AU - Bozhevolnyi, S.I.
PY - 2008
Y1 - 2008
N2 - Fractal shaped periodic nanostructures formed with a 100 nm period square lattice of gold nanoparticles placed on a gold film are characterized using far-field nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly focused femtosecond laser beam (in the wavelength range of 730-790 nm) is detected. TPL images obtained for all wavelengths in the laser range feature diffraction-limited (~0.6 µm) bright spots corresponding to intensity enhancements of up to ~170, whose positions are dictated by the incident light wavelength and polarization. We relate the observed TPL enhancements to constructive interference of surface plasmon polaritons partially reflected inside the structure boundaries and support the analysis with numerical simulations using the Green dyadic field propagator.
AB - Fractal shaped periodic nanostructures formed with a 100 nm period square lattice of gold nanoparticles placed on a gold film are characterized using far-field nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly focused femtosecond laser beam (in the wavelength range of 730-790 nm) is detected. TPL images obtained for all wavelengths in the laser range feature diffraction-limited (~0.6 µm) bright spots corresponding to intensity enhancements of up to ~170, whose positions are dictated by the incident light wavelength and polarization. We relate the observed TPL enhancements to constructive interference of surface plasmon polaritons partially reflected inside the structure boundaries and support the analysis with numerical simulations using the Green dyadic field propagator.
U2 - 10.1364/JOSAB.25.001585
DO - 10.1364/JOSAB.25.001585
M3 - Journal article
SN - 0740-3224
VL - 25
SP - 1585
EP - 1592
JO - Journal of the Optical Society of America - B - Optical Physics
JF - Journal of the Optical Society of America - B - Optical Physics
IS - 10
ER -