Abstract
Plasmonic phenomena in metals have garnered significant scientific and technological interest in the past decade. Despite many promising applications based on plasmonics, one remaining challenge is to control the surface geometry or morphology of the metallic structures, which can significantly affect the plasmonic properties of nanostructures. Here, we report the morphological modulation of gold (Au) nanopatterns on atomically thin layered molybdenum disulfide (MoS2), compared to Au nanopatterns grown on SiO2/Si substrate. We have used electron energy loss spectroscopy in a scanning transmission electron microscope to probe the locally enhanced surface plasmons in nanoporous Au patterns grown on SiO2/Si substrate as well as on single- and few-layer MoS2 flakes. Thin flakes of MoS2 as substrates significantly influence the morphology of Au patterns, which locally alters the plasmonic behavior. Features such as nanoscale pores exhibit plasmon localization with strong near fields, akin to "hot spots." Boundary element method simulations demonstrate that the dipolar and breathing modes can be excited at different positions of the nanopatterns.
Original language | English (US) |
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Article number | 091901 |
Journal | Applied Physics Letters |
Volume | 108 |
Issue number | 9 |
DOIs | |
State | Published - Feb 29 2016 |
Funding
The authors would like to thank MRSEC program of the National Science Foundation (DMR-1121262) at the Materials Research Center of Northwestern University and Air Force Office of Scientific Research (Sponsor Reference Award #: FA9550-12-1-0280). This work was performed in the EPIC facilities of NUANCE center of Northwestern University. The NUANCE Center is supported by NSF, Keck Foundation, the State of Illinois, and Northwestern University. The authors would like to thank Professor Teri Odom, Dr. Shiqiang Li, Mr. Ben Myers, and Dr. Yi-Kai Huang for useful discussion.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)