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This research aims to explore the interaction of mid-infrared light with phonon polaritons and epsilon-near-zero modes in sapphire nanocones.

January 17, 2026RSC Advances0 citationsOpen Access

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Understanding phonon polaritons and epsilon-near-zero modes in sapphire nanocones across the broad Reststrahlen band (385–1050 cm −1 )

MNMilad NourbakhshUniversity of Oklahoma KAKiernan E. ArledgeUniversity of Oklahoma VWVincent R. WhitesideUniversity at Buffalo, State University of New York

Key Points

This research aims to explore the interaction of mid-infrared light with phonon polaritons and epsilon-near-zero modes in sapphire nanocones.
Utilized a nanocone-patterned sapphire dielectric platform
Examined excitation of phonon polariton modes
Investigated epsilon-near-zero modes across the Reststrahlen band
Identified multiple excitations of phonon polaritons
Highlighted the effectiveness of sapphire for mid-infrared light interactions
Confirmed the presence of epsilon-near-zero modes within the specified band

Abstract

Nanocone-patterned sapphire serves as an excellent dielectric platform for enhanced mid-infrared light–matter interactions, enabling the excitation of multiple phonon polariton and epsilon-near-zero modes in a broad Reststrahlen band.

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Understanding phonon polaritons and epsilon-near-zero modes in sapphire nanocones across the broad Reststrahlen band (385–1050 cm −1 )

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