Strong Confinement of Optical Fields Using Localized Surface Phonon Polaritons in Cubic Boron Nitride
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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Phonon polaritons PhPs are long-lived electromagnetic modes that originate from the coupling of infrared IR photons with the bound ionic lattice of a polar crystal. Cubic-boron nitride cBN is such a polar, semiconductor material which, due to the light atomic masses, can support high-frequency optical phonons. Here we report on random arrays of cBN nanostructures fabricated via an unpatterned reactive ion etching process. Fourier-transform infrared reflection spectra suggest the presence of localized surface PhPs within the Reststrahlen band, with quality factors in excess of 38 observed. These can provide the basis of next-generation IR optical components such as antennas for communication, improved chemical spectroscopies, and enhanced emitters, sources, and detectors.