Experimental cross-polarization detection of coupling far-field light to highly confined plasmonic gap modes via nanoantennas

Abstract

We experimentally demonstrate the coupling of far-field light to highly confined plasmonic gap modes via connected nanoantennas. The excitation of plasmonic gap modes is shown to depend on the polarization, position and wavelength of the incident beam. Far-field measurements performed in crossed polarization allow for the detection of extremely weak signals re-emitted from gap waveguides and can increase the signal-to-noise ratio dramatically.

arXiv comment5 figures; http://apl.aip.org/

References in corpus (2)

• Impedance matching and emission properties of optical antennas in a nanophotonic circuit
• Experimental demonstration of fiber-accessible metal nanoparticle plasmon waveguides for planar energy guiding and sensing

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