Bowtie plasmonic quantum cascade laser antenna


Nanfang Yu, Ertugrul Cubukcu, Laurent Diehl, David Bour, Scott Corzine, Jintian Zhu, Gloria Hoefler, Kenneth B. Crozier, and Federico Capasso. 2007. “Bowtie plasmonic quantum cascade laser antenna.” Optics Express, 15, 20, Pp. 13272-13281. Publisher's Version
oe-15-20-13272.pdf505 KB


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 mu m. (C) 2007 Optical Society of America.
Last updated on 05/23/2020