POLARIZATION-CONTROLLABLE WINGED NANOCONE TIP ANTENNA

2011 ◽  
Vol 20 (04) ◽  
pp. 415-425 ◽  
Author(s):  
MIKKO J. HUTTUNEN ◽  
JOUNI MÄKITALO ◽  
MARTTI KAURANEN
Keyword(s):  
Local Field ◽  
Near Field ◽  
Optical Antennas ◽  
Background Suppression ◽  
Far Field ◽  
Plasmon Resonances ◽  
Field Radiation ◽  
Efficient Coupling ◽  
Particle Plasmon ◽  
Field Enhancements

We propose winged metal nanocone optical antennas for efficient coupling of far-field radiation into the near-field of sharp metal tips. Unlike normal sharp metal tips, the winged nanocones require no oscillating field along the tip axis for the excitation of the tips. We calculate extinction spectra and local-field enhancements for single and winged gold nanocones and show that the field enhancements in the tips of the winged cones are due to a combination of particle plasmon resonances and a lightning-rod effect. We also propose that the winged nanocones could be used for optical far-field background suppression for tip-enhanced microscopy.

scholarly journals Scattering centers modeling of non-anechoic measurement environments

2012 ◽  
Vol 10 ◽  
pp. 69-73 ◽  
Author(s):  
K. A. Yinusa ◽  
C. H. Schmidt ◽  
T. F. Eibert
Keyword(s):  
Near Field ◽  
Field Measurements ◽  
Field Pattern ◽  
Far Field ◽  
Scattering Centers ◽  
Field Transformation ◽  
Field Radiation ◽  
Echo Suppression ◽  
Multipath Signals ◽  
Far Field Pattern

Abstract. Near-field measurements are established techniques to obtain the far-field radiation pattern of an Antenna Under Test via near-field measurements and subsequent near-field far-field transformation. For measurements acquired in echoic environments, additional post-processing is required to eliminate the effects of multipath signals in the resulting far-field pattern. One of such methods models the measurement environment as a multiple source scenario whereby the collected near-field data is attributed to the AUT and some scattering centers in the vicinity of the AUT. In this way, the contributions of the AUT at the probe can be separated from those of the disturbers during the near-field far-field transformation if the disturber locations are known. In this paper, we present ways of modeling the scattering centers on equivalent surfaces such that echo suppression is possible with only partial or no information about the geometry of the scatterers.

Classical connection between near-field interactions and far-field radiation and the relevance to quantum photoemission

2013 ◽  
Vol 81 (5) ◽  
pp. 351-358 ◽  
Author(s):  
Justin Peatross ◽  
John P. Corson ◽  
Grayson Tarbox
Keyword(s):  
Near Field ◽  
Far Field ◽  
Field Radiation
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