Bowtie plasmonic quantum cascade laser antenna

We report a bowtie plasmonic quantum cascade laser antenna that can confine coherent mid-infrared radiation well below the diffraction limit. The antenna is fabricated on the facet of a mid-infrared quantum cascade laser and consists of a pair of gold fan-like segments, whose narrow ends are separat...

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Bibliographic Details
Published in:Optics express 2007-10, Vol.15 (20), p.13272-13281
Main Authors: Yu, Nanfang, Cubukcu, Ertugrul, Diehl, Laurent, Bour, David, Corzine, Scott, Zhu, Jintian, Höfler, Gloria, Crozier, Kenneth B, Capasso, Federico
Format: Article
Language:English
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Summary:We report a bowtie plasmonic quantum cascade laser antenna that can confine coherent mid-infrared radiation well below the diffraction limit. The antenna is fabricated on the facet of a mid-infrared quantum cascade laser and consists of a pair of gold fan-like segments, whose narrow ends are separated by a nanometric gap. Compared with a nano-rod antenna composed of a pair of nano-rods, the bowtie antenna efficiently suppresses the field enhancement at the outer ends of the structure, making it more suitable for spatially-resolved high-resolution chemical and biological imaging and spectroscopy. The antenna near field is characterized by an apertureless near-field scanning optical microscope; field confinement as small as 130 nm is demonstrated at a wavelength of 7.0 mum.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.15.013272