Mach–Zehnder Interferometer-Based Integrated Terahertz Temperature Sensor

Youqiao Ma, Nghia Nguyen-Huu, Jun Zhou, Hiroshi Maeda, Qiang Wu, Mohamed Eldlio, Jaromir Pistora, Michael Cada

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
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A plasmonic Mach-Zehnder interferometer (MZI) for temperature sensing is reported in the terahertz (THz) regime. The MZI is formed by embedding a semiconductor (SC) layer into a silicon membrane, where the SC layer supports two independent propagating surface plasmon polariton (SPP) waves on both surfaces. The temperature-sensitive phase difference between these two SPP waves gives rise to the modulation of the transmitted intensity. The results show that the MZI sensor possesses a sensitivity and a figure of merit as high as 8.9 × 10-3 THz/K and 117, respectively. Theoretical calculations indicate that the further improvement in sensing performance is still possible through optimization of the structure Moreover, an investigation of structural perturbations indicates that the MZI has a good tolerance to the fabrication errors. The compact MZI-based waveguide structure may find important applications in areas of sensing and integrated THz circuits.
Original languageEnglish
Pages (from-to)4601607
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number4
Early online date27 Jan 2017
Publication statusPublished - Jul 2017


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