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Proceedings Paper

Electromagnetic field confinement in the gap of germanium nanoantennas with plasma wavelength of 4.5 micrometers
Author(s): Eugenio Calandrini; Tommaso Venanzi; Felice Appugliese; Michela Badioli; Valeria Giliberti; Leonetta Baldassarre; Paolo Biagioni; Francesco De Angelis; Wolfgang M. Klesse; Giordano Scappucci; Michele Ortolani
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Paper Abstract

Plasmonic nanoantenna designs are quickly evolving in the direction of practical molecular sensing applications hence their wavelength range is being extended from the visible towards the mid-infrared. The problem of obtaining, in the mid-infrared, the same degree of plasmonic confinement obtained with gold in the visible range is related to the perfect conductor behavior of metals at long wavelengths. Here we fabricated bow-tie nanoantennas made of bottom-up assembled “metallic germanium” with free electron density of the order of 1020 cm-3 and therefore short plasma wavelength of 4.5 μm. We demonstrate the existence in the antenna gaps of confined hotspots with radius of the order of 100 nm, which we imaged by near-field photoexpansion microscopy at a wavelength of 5.8 μm in order to provide a clear proof of strong field confinement in the mid-infrared.

Paper Details

Date Published: 27 January 2017
PDF: 8 pages
Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101110F (27 January 2017); doi: 10.1117/12.2253841
Show Author Affiliations
Eugenio Calandrini, Istituto Italiano di Tecnologia (Italy)
Tommaso Venanzi, Sapienza Univ. di Roma (Italy)
Felice Appugliese, Sapienza Univ. di Roma (Italy)
Michela Badioli, Sapienza Univ. di Roma (Italy)
Valeria Giliberti, Sapienza Univ. di Roma (Italy)
Istituto Italiano di Tecnologia (Italy)
Leonetta Baldassarre, Sapienza Univ. di Roma (Italy)
Istituto Italiano di Tecnologia (Italy)
Paolo Biagioni, Politecnico di Milano (Italy)
Francesco De Angelis, Istituto Italiano di Tecnologia (Italy)
Wolfgang M. Klesse, Univ. of New South Wales (Australia)
Giordano Scappucci, Univ. of New South Wales (Australia)
Delft Univ. of Technology (Netherlands)
Michele Ortolani, Istituto Italiano di Tecnologia (Italy)

Published in SPIE Proceedings Vol. 10111:
Quantum Sensing and Nano Electronics and Photonics XIV
Manijeh Razeghi, Editor(s)

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