Spectrometer-Free Graphene Plasmonics Based Refractive Index Sensor

Li Zhang, Mohamed Farhat, Khaled N. Salama

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We propose a spectrometer-free refractive index sensor based on a graphene plasmonic structure. The spectrometer-free feature of the device is realized thanks to the dynamic tunability of graphene’s chemical potential, through electrostatic biasing. The proposed sensor exhibits a 1566 nm/RIU sensitivity, a 250.6 RIU−1 figure of merit in the optical mode of operation and a 713.2 meV/RIU sensitivity, a 246.8 RIU−1 figure of merit in the electrical mode of operation. This performance outlines the optimized operation of this spectrometer-free sensor that simplifies its design and can bring terahertz sensing one step closer to its practical realization, with promising applications in biosensing and/or gas sensing.
Original languageEnglish (US)
Pages (from-to)2347
Issue number8
StatePublished - Apr 21 2020


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