The surface exciton polariton (SEP), a photon-electron-hole quasiparticle at the surface of a crystal, has potential for sensing applications. SEP sensors have hardly been explored, as they would operate at cryogenic temperatures, but recently a room-temperature device in the so-called K-R configuration was successfully demonstrated. In this paper the performance of an SEP sensor in a modified K-R configuration is theoretically investigated; it is predicted to show higher sensitivity in both bulk and surface sensing, compared to a conventional Au-based surface-plasmon-polariton device.
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