Amplitude- and phase-resolved optical near fields of split-ring-resonator-based metamaterials.
We investigate the local optical response of split-ring resonator-(SRR)-based metamaterials with an apertureless scanning near-field optical microscope. By mapping the near fields of suitably resonant micrometer-sized SRRs in the near-infrared spectral region with an uncoated silicon tip, we obtain a spatial resolution of better than lambda/50. The experimental results confirm numerical predictions of the near-field excitations of SRRs. Combining experimental near-field optical studies with near- and far-field optical simulations provides a detailed understanding of resonance mechanisms in subwavelength structures and will facilitate an efficient approach to improved designs.
Zentgraf
T
T
4. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany. t.zentgraf@fkf.mpg.de
Dorfmüller
J
J
Rockstuhl
C
C
Etrich
C
C
Vogelgesang
R
R
Kern
K
K
Pertsch
T
T
Lederer
F
F
Giessen
H
H