Nanofocusing with channel plasmon polaritons.
We investigate radiation nanofocusing with channel plasmon polaritons (CPPs) propagating along subwavelength metal grooves that are tapered synchronously in depth and in width. Efficient CPP nanofocusing at telecom wavelengths with the estimated field intensity enhancement of up to approximately 90 is directly demonstrated using near-field microscopy. Experimental observations are concurred with electromagnetic simulations, predicting the possibility of reaching the intensity enhancements of approximately 1200 and opening thereby exciting perspectives for practical applications of CPP nanofocusing.
Volkov
Valentyn S
VS
Institute of Sensors, Signals and Electrotechnics (SENSE), University of Southern Denmark, Niels Bohrs Allé 1, DK-5230 Odense M, Denmark.
Bozhevolnyi
Sergey I
SI
Rodrigo
Sergio G
SG
Martín-Moreno
Luis
L
García-Vidal
Francisco J
FJ
Devaux
Eloíse
E
Ebbsen
Thomas W
TW
D004867:Equipment Design; D007089:Image Enhancement / Q000295:instrumentation*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D008853:Microscopy / Q000379:methods; D008855:Microscopy, Electron, Scanning / Q000379:methods; D015233:Models, Statistical; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D020349:Surface Plasmon Resonance
D008670:Metals