Journal article
Polaritonic Hybrid-Epsilon-near-Zero Modes: Beating the Plasmonic Confinement vs Propagation-Length Trade-Off with Doped Cadmium Oxide Bilayers
Nano letters, Vol.19(2), pp.948-957
02/13/2019
DOI: 10.1021/acs.nanolett.8b04182
PMID: 30582700
Abstract
Polaritonic materials that support epsilon-near zero (ENZ) modes offer the opportunity to design light-matter interactions at the nanoscale through extreme subwavelength light confinement, producing phenomena like resonant perfect absorption. However, the utility of ENZ modes in nanophotonic applications has been limited by a flat spectral dispersion, which leads to small group velocities and extremely short propagation lengths. Here, we overcome this constraint by hybridizing ENZ and surface plasmon polariton (SPP) modes in doped cadmium oxide epitaxial bilayers. This results in strongly coupled hybrid modes that are characterized by an anticrossing in the polariton dispersion and a large spectral splitting on the order of 1/3 of the mode frequency. These hybrid modes simultaneously achieve modal propagation and ENZ mode-like interior field confinement, adding propagation character to ENZ mode properties. We subsequently tune the resonant frequencies, dispersion, and coupling of these polaritonic-hybrid-epsilon-near-zero (PH-ENZ) modes by tailoring the modal oscillator strength and the ENZ-SPP spectral overlap. PH-ENZ modes ultimately leverage the most desirable characteristics of both ENZ and SPP modes, allowing us to overcome the canonical plasmonic trade-off between confinement and propagation length.
Details
- Title: Subtitle
- Polaritonic Hybrid-Epsilon-near-Zero Modes: Beating the Plasmonic Confinement vs Propagation-Length Trade-Off with Doped Cadmium Oxide Bilayers
- Creators
- Evan L. Runnerstrom - North Carolina State UniversityKyle P. Kelley - North Carolina State UniversityThomas G. Folland - Vanderbilt UniversityJ. Ryan Nolen - Vanderbilt UniversityNader Engheta - University of PennsylvaniaJoshua D. Caldwell - Vanderbilt UniversityJon-Paul Maria - Pennsylvania State University
- Resource Type
- Journal article
- Publication Details
- Nano letters, Vol.19(2), pp.948-957
- Publisher
- Amer Chemical Soc
- DOI
- 10.1021/acs.nanolett.8b04182
- PMID
- 30582700
- ISSN
- 1530-6984
- eISSN
- 1530-6992
- Number of pages
- 10
- Grant note
- CHE-1507947 / NSF; National Science Foundation (NSF) Vanderbilt School of Engineering Vannevar Bush Faculty Fellowship program - Basic Research Office of the Assistant Secretary of Defense for Research and Engineering ECCS-1542015 / National Science Foundation; National Science Foundation (NSF) W911NF-16-1-0406; W911NF-16-1-0037 / Army Research Office State of North Carolina N00014-18-12107; N00014-16-1-2029 / Office of Naval Research
- Language
- English
- Date published
- 02/13/2019
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428815002771
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