Title:
Lambda/4 Resonance of an Optical Monopole Antenna Probed by Single Molecule Fluorescence
Author(s):
Tim H. Taminiau, Robert J. Moerland, Frans B. Segerink,
Laurens Kuipers, and Niek F. van Hulst
Source:
NANO LETTERS
Vol./Issue/Date:
Vol. 7, No. 1, 2007
Year:
2007
Page(s):
28-33
Keywords:
Abstract:
We present a resonant optical nanoantenna positioned at the end of a metal-coated glass fiber near-field probe. Antenna resonances, excitation
conditions, and field localization are directly probed in the near field by single fluorescent molecules and compared to finite integration
technique simulations. It is shown that the antenna is equivalent to its radio frequency analogue, the monopole antenna. For the right antenna
length and local excitation conditions, antenna resonances occur that lead to an enhanced localized field near the antenna apex. Direct
mapping of this field with single fluorescent molecules reveals a spatial localization of 25 nm, demonstrating the importance of such antennas
for nanometer resolution optical microscopy.
Document:
Reference Id:
322
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