Nonlinear microscopy of localized field enhancements in fractal shaped periodic metal nanostructures
JOSA B, Vol. 25, Issue 10, pp. 1585-1592 doi:10.1364/JOSAB.25.001585
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- OCIS Codes:
- (180.5810) Microscopy : Scanning microscopy
- (240.4350) Optics at surfaces : Nonlinear optics at surfaces
- (240.6680) Optics at surfaces : Surface plasmons
- (290.4210) Scattering : Multiple scattering
Optics at Surfaces
Citation
Jonas Beermann, Andrey Evlyukhin, Alexandra Boltasseva, and Sergey I. Bozhevolnyi, "Nonlinear microscopy of localized field enhancements in fractal shaped periodic metal nanostructures," J. Opt. Soc. Am. B 25, 1585-1592 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-10-1585
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MendeleyAbstract
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.
© 2008 Optical Society of America
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History
Original Manuscript: July 10, 2008
Manuscript Accepted: July 13, 2008
Published: September 8, 2008
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Author Affiliations
DTU Photonics
University of Southern Denmark
Vladimir State University
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