Coupled surface magnetoplasmon-optic-phonon polariton modes on InSb

Coupled surface magnetoplasmon-optic-phonon polariton modes at $n$-type InSb-air interfaces have been studied using a far-infared, attenuated-total-reflection (ATR) method in the configuration with an external magnetic field aligned parallel to the surface-mode wave vector (a Faraday configuration). Calculated ATR spectra are compared with experimental ATR spectra and with calulated dispersion curves to aid in assigning the various observed absorption lines as due to either surface modes or bulk modes.