Localized field enhancements in fractal shaped periodic metal nanostructures

Jonas Beermann, Ilya Radko, Alexandra Boltasseva, Sergey I. Bozhevolnyi

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Fractal shaped structures formed with a 100-nm-period square lattice of gold nanoparticles placed on a gold film are characterized by using far-field nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly focused laser beam (in the wavelength range of 730 – 790 nm) is detected. The TPL images recorded for all wavelengths exhibit diffraction-limited (~ 0.6 μm) bright spots corresponding to the field intensity enhancement of up to 150, whose positions are dictated by the incident light wavelength and polarization. We relate these field enhancements to the occurrence of constructive interference of surface plasmons (SPs), which are excited by the incident radiation (due to scattering by nanoparticles) and partially reflected by fractal shaped boundaries due to a difference in the SP effective index at a flat and periodically corrugated gold surface. The conjecture on SP index difference is verified with observations (using leakage radiation microscopy) of SP focusing by circular and waveguiding by rectangular areas filled with periodically arranged nanoparticles.
OriginalsprogEngelsk
TidsskriftOptics Express
Vol/bind15
Udgave nummer23
Sider (fra-til)15234-15241
ISSN1094-4087
DOI
StatusUdgivet - 2007

Fingeraftryk

fractals
plasmons
augmentation
metals
gold
nanoparticles
wavelengths
microscopy
photoluminescence
incident radiation
photons
far fields
leakage
laser beams
occurrences
interference
scanning
polarization
radiation
scattering

Citer dette

Beermann, Jonas ; Radko, Ilya ; Boltasseva, Alexandra ; Bozhevolnyi, Sergey I. / Localized field enhancements in fractal shaped periodic metal nanostructures. I: Optics Express. 2007 ; Bind 15, Nr. 23. s. 15234-15241.
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title = "Localized field enhancements in fractal shaped periodic metal nanostructures",
abstract = "Fractal shaped structures formed with a 100-nm-period square lattice of gold nanoparticles placed on a gold film are characterized by using far-field nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly focused laser beam (in the wavelength range of 730 – 790 nm) is detected. The TPL images recorded for all wavelengths exhibit diffraction-limited (~ 0.6 μm) bright spots corresponding to the field intensity enhancement of up to 150, whose positions are dictated by the incident light wavelength and polarization. We relate these field enhancements to the occurrence of constructive interference of surface plasmons (SPs), which are excited by the incident radiation (due to scattering by nanoparticles) and partially reflected by fractal shaped boundaries due to a difference in the SP effective index at a flat and periodically corrugated gold surface. The conjecture on SP index difference is verified with observations (using leakage radiation microscopy) of SP focusing by circular and waveguiding by rectangular areas filled with periodically arranged nanoparticles.",
author = "Jonas Beermann and Ilya Radko and Alexandra Boltasseva and Bozhevolnyi, {Sergey I.}",
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Localized field enhancements in fractal shaped periodic metal nanostructures. / Beermann, Jonas; Radko, Ilya; Boltasseva, Alexandra; Bozhevolnyi, Sergey I.

I: Optics Express, Bind 15, Nr. 23, 2007, s. 15234-15241.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Localized field enhancements in fractal shaped periodic metal nanostructures

AU - Beermann, Jonas

AU - Radko, Ilya

AU - Boltasseva, Alexandra

AU - Bozhevolnyi, Sergey I.

PY - 2007

Y1 - 2007

N2 - Fractal shaped structures formed with a 100-nm-period square lattice of gold nanoparticles placed on a gold film are characterized by using far-field nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly focused laser beam (in the wavelength range of 730 – 790 nm) is detected. The TPL images recorded for all wavelengths exhibit diffraction-limited (~ 0.6 μm) bright spots corresponding to the field intensity enhancement of up to 150, whose positions are dictated by the incident light wavelength and polarization. We relate these field enhancements to the occurrence of constructive interference of surface plasmons (SPs), which are excited by the incident radiation (due to scattering by nanoparticles) and partially reflected by fractal shaped boundaries due to a difference in the SP effective index at a flat and periodically corrugated gold surface. The conjecture on SP index difference is verified with observations (using leakage radiation microscopy) of SP focusing by circular and waveguiding by rectangular areas filled with periodically arranged nanoparticles.

AB - Fractal shaped structures formed with a 100-nm-period square lattice of gold nanoparticles placed on a gold film are characterized by using far-field nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly focused laser beam (in the wavelength range of 730 – 790 nm) is detected. The TPL images recorded for all wavelengths exhibit diffraction-limited (~ 0.6 μm) bright spots corresponding to the field intensity enhancement of up to 150, whose positions are dictated by the incident light wavelength and polarization. We relate these field enhancements to the occurrence of constructive interference of surface plasmons (SPs), which are excited by the incident radiation (due to scattering by nanoparticles) and partially reflected by fractal shaped boundaries due to a difference in the SP effective index at a flat and periodically corrugated gold surface. The conjecture on SP index difference is verified with observations (using leakage radiation microscopy) of SP focusing by circular and waveguiding by rectangular areas filled with periodically arranged nanoparticles.

U2 - 10.1364/OE.15.015234

DO - 10.1364/OE.15.015234

M3 - Journal article

VL - 15

SP - 15234

EP - 15241

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 23

ER -