Abstract

A surface plasmon resonance (SPR) waveguide sensor with a thin InSb layer adopted for the sensing section is proposed in the terahertz region. First, the eigenmode analysis is carried out for the sensing section with water as an analyte. The surface plasmon polariton eigenmodes are shown to exist in the sensing section, and the SPR is expected to be maximum around 1.28 THz at 300 K. Next, the performance of the sensor is investigated using the finite-difference time-domain method, with special attention to the treatment of the interface between InSb and water. As expected, the SPR absorption is found to become maximum at 1.26 THz. Furthermore, the SPR response is examined, in which an ability is shown to detect a temperature variation ranging from 280 to 320 K. As an application, final consideration is given to the possibility of detecting a mixture of an organic solvent and water.

© 2016 IEEE

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