Abstract
There has been increasing interest in so-called phononic materials, which can support surface modes known as surface phonon polaritons, consisting of electromagnetic waves coupled to lattice vibrations at the surface of a polar material. While such excitations have a variety of desirable features, they are limited to the spectral range between a material’s longitudinal and transverse optical phonon frequencies. In this work, we demonstrate that for materials whose free-carrier concentrations can be controlled, hybrid plasmonic/phononic modes can be supported across a range of frequencies including those generally forbidden by purely phononic materials.
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Acknowledgments
The authors would like to acknowledge funding from the National Science Foundation, Awards #ECCS 14-20952 (DW and WS) and #ECCS 12-20176 (AH and KF) and from the Illinois Drive Postdoctoral Fellowship (YZ). The authors gratefully acknowledge useful advice and discussion with V. Podolskiy and C. Roberts (UMass Lowell) regarding RCWA simulations.
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Streyer, W., Feng, K., Zhong, Y. et al. Engineering the Reststrahlen band with hybrid plasmon/ phonon excitations. MRS Communications 6, 1–8 (2016). https://doi.org/10.1557/mrc.2015.81
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DOI: https://doi.org/10.1557/mrc.2015.81