Tuning and hybridization of surface phonon polaritons in α-MoO3 based metamaterials

Maria Cristina Larciprete*, Sina Abedini Dereshgi, Marco Centini, Koray Aydin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We propose an effective medium approach to tune and control surface phonon polariton dispersion relations along the three main crystallographic directions of α-phase molybdenum trioxide. We show that a metamaterial consisting of subwavelength air inclusions into the α-MoO3 matrix displays new absorption modes producing a split of the Reststrahlen bands of the crystal and creating new branches of phonon polaritons. In particular, we report hybridization of bulk and surface polariton modes by tailoring metamaterials' structural parameters. Theoretical predictions obtained with the effective medium approach are validated by full-field electromagnetic simulations using finite difference time domain method. Our study sheds light on the use of effective medium theory for modeling and predicting wavefront polaritons. Our simple yet effective approach could potentially enable different functionalities for hyperbolic infrared metasurface devices and circuits on a single compact platform for on-chip infrared photonics.

Original languageEnglish (US)
Pages (from-to)12788-12796
Number of pages9
JournalOptics Express
Volume30
Issue number8
DOIs
StatePublished - Apr 11 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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