TY - JOUR
T1 - Mapping magnetic near-field distributions of plasmonic nanoantennas
AU - Denkova, Denitza
AU - Verellen, Niels
AU - Silhanek, Alejandro V.
AU - Valev, Ventsislav K.
AU - Dorpe, Pol Van
AU - Moshchalkov, Victor V.
PY - 2013/4/23
Y1 - 2013/4/23
N2 - We present direct experimental mapping of the lateral magnetic near-field distribution in plasmonic nanoantennas using aperture scanning near-field optical microscopy (SNOM). By means of full-field simulations it is demonstrated how the coupling of the hollow-pyramid aperture probe to the nanoantenna induces an effective magnetic dipole which efficiently excites surface plasmon resonances only at lateral magnetic field maxima. This excitation in turn affects the detected light intensity enabling the visualization of the lateral magnetic near-field distribution of multiple odd and even order plasmon modes with subwavelength spatial resolution.
AB - We present direct experimental mapping of the lateral magnetic near-field distribution in plasmonic nanoantennas using aperture scanning near-field optical microscopy (SNOM). By means of full-field simulations it is demonstrated how the coupling of the hollow-pyramid aperture probe to the nanoantenna induces an effective magnetic dipole which efficiently excites surface plasmon resonances only at lateral magnetic field maxima. This excitation in turn affects the detected light intensity enabling the visualization of the lateral magnetic near-field distribution of multiple odd and even order plasmon modes with subwavelength spatial resolution.
KW - hollow-pyramid probe
KW - near-field imaging
KW - optical magnetic field
KW - optical nanobar antenna
KW - probe-sample coupling
KW - surface plasmon resonance
UR - http://www.scopus.com/inward/record.url?scp=84876526015&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1021/nn305589t
U2 - 10.1021/nn305589t
DO - 10.1021/nn305589t
M3 - Article
C2 - 23464670
AN - SCOPUS:84876526015
SN - 1936-0851
VL - 7
SP - 3168
EP - 3176
JO - ACS Nano
JF - ACS Nano
IS - 4
ER -