Localized surface phonon polariton resonances in polar gallium nitride

Kaijun Feng, William Streyer, S. M. Islam, Jai Verma, Debdeep Jena, Daniel Wasserman, Anthony J. Hoffman

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate the excitation of localized surface phonon polaritons in an array of sub-diffraction pucks fabricated in an epitaxial layer of gallium nitride (GaN) on a silicon carbide (SiC) substrate. The array is characterized via polarization- and angle-dependent reflection spectroscopy in the mid-infrared, and coupling to several localized modes is observed in the GaN Reststrahlen band (13.4-18.0 μm). The same structure is simulated using finite element methods and the charge density of the modes are studied; transverse dipole modes are identified for the transverse electric and magnetic polarizations and a quadrupole mode is identified for the transverse magnetic polarization. The measured mid-infrared spectrum agrees well with numerically simulated spectra. This work could enable optoelectronic structures and devices that support surface modes at mid- and far-infrared wavelengths.

Original languageEnglish (US)
Article number081108
JournalApplied Physics Letters
Volume107
Issue number8
DOIs
StatePublished - Aug 24 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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