posted on 2020-03-09, 17:43authored bySheng Wang, Fanqi Wu, Kenji Watanabe, Takashi Taniguchi, Chongwu Zhou, Feng Wang
Plasmonic resonators
enable deep subwavelength manipulation of
light matter interactions and have been intensively studied both in
fundamental physics as well as for potential technological applications.
While various metallic nanostructures have been proposed as plasmonic
resonators, their performances are rather limited at mid- and far-infrared
wavelengths. Recently, highly confined and low-loss Luttinger liquid
plasmons in metallic single-walled carbon nanotubes (SWNTs) have been
observed at infrared wavelengths. Here, we tailor metallic SWNTs into
ultraclean nanocavities by advanced scanning probe lithography and
investigate plasmon modes in these individual nanocavities by infrared
nanoimaging. The dependence of mode evolutions on cavity length and
excitation wavelength can be captured by a Fabry–Perot resonator
model of a plasmon nanowaveguide terminated by highly reflective ends.
Plasmonic resonators based on SWNT nanocavities approach the ultimate
plasmon confinement limit and open the door to the strong light-matter
coupling regime, which may enable various nanophotonic applications.