Kretschmann-and Otto-type surface plasmon resonance (SPR) waveguide sensors are numerically investigated at terahertz frequencies. The reflectance of a three-layer model for the Kretschmann-type sensor is examined with the Fresnel equation, in order to determine the angle of incidence of the waveguide. Using the frequencydependent finite-difference time-domain method, the SPR response of the waveguide sensor is investigated for temperature variations. It is found that a high sensitivity of 2.63 × 10 −2 THz/K more than three times as large as that of the conventional SPR waveguide sensor is successfully achieved with a sensing length of about half that of the conventional one. The Otto-type waveguide sensor is also examined and discussed. It is revealed that the sensor provides steep and stable SPR responses, maintaining the sensitivity of the Kretschmann-type one.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.