Optical response of nanohole arrays filled with chalcogenide low-epsilon media

• Main Authors: Piccinotti, Davide, Gholipour, Behrad, Yao, Jin, MacDonald, Kevin F., Hayden, Brian E., Zheludev, Nikolay I.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics::Optics and light; Chalcogenides; Low Epsilon
• Online Access: https://hdl.handle.net/10356/136872
• Institution: Nanyang Technological University

When an array of subwavelength apertures in a metal film is filled with a chalcogenide semiconductor acting as a low‐epsilon medium at optical frequencies, an increase in transmission is observed over a broad range of plasmonic frequencies, and found to be enabled by “laminar” flow of energy through the chalcogenide inclusions. As losses decrease in such a low‐epsilon medium, with causality‐bound dispersion of complex relative permittivity, a peak in transmission emerges at a wavelength tending toward that of unitary refractive index, while counterintuitively the absorption of the composite structure increases.