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Polaritonic hybrid-epsilon-near-zero modes: engineering strong optoelectronic coupling and dispersion in doped cadmium oxide bilayers (Conference Presentation)
Author(s): Thomas Folland; Evan L. Runnerstrom; Kyle P. Kelly; Nader Engheta; Joshua D. Caldwell; Jon-Paul Maria
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Paper Abstract

Polaritonic materials that support epsilon-near-zero (ENZ) modes offer the opportunity to design light-matter interactions at the nanoscale through phenomena like resonant perfect absorption and extreme sub-wavelength light concentration. To date, the utility of ENZ modes is limited in propagating polaritonic systems by a relatively flat spectral dispersion, which gives ENZ modes small group velocities and therefore short propagation lengths. Here we overcome this constraint by coupling ENZ modes to surface plasmon polariton (SPP) modes in doped cadmium oxide ENZ-on-SPP bilayers. What results is a strongly coupled hybrid mode, characterized by strong anti-crossing and a large spectral splitting on the order of 1/3 of the mode frequency. The resonant frequencies, dispersion, and coupling of these polaritonic-hybrid-epsilon-near-zero (PH-ENZ) modes are controlled by tailoring the modal oscillator strength and the ENZ-SPP spectral overlap. As cadmium oxide supports polaritons over a wide range of carrier concentrations without excessive losses, strong coupling effects can potentially be utilized for actively tunable strong coupling at the nanoscale. PH-ENZ modes ultimately leverage the most desirable characteristics of both ENZ and SPP modes through simultaneous strong interior field confinement and mode propagation. As a result, this system could see applications in sub-diffraction modulators using carrier injection schemes, or narrow linewidth thermal emitters working in the 3-5µm spectral window.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 1092709 (4 March 2019); doi: 10.1117/12.2506826
Show Author Affiliations
Thomas Folland, Vanderbilt Univ. (United States)
Evan L. Runnerstrom, North Carolina State Univ. (United States)
Kyle P. Kelly, North Carolina State Univ. (United States)
Nader Engheta, Univ. of Pennsylvania (United States)
Joshua D. Caldwell, Vanderbilt Univ. (United States)
Jon-Paul Maria, North Carolina State Univ. (United States)
The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 10927:
Photonic and Phononic Properties of Engineered Nanostructures IX
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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