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

Puntos clave

• 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