Sensitive voltage interrogation method using electro-optically tunable SPR sensors

Zhiyou Wang, Zheng Zheng, Kun Wang, Yalin Su, Lei Liu, Lusheng Song, Yusheng Bian, Rui Hou, Shaopeng Li, Jinsong Zhu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A novel voltage interrogation method using electro-optically tunable waveguide-coupled surface plasmon resonance sensors is demonstrated. Before measurements, we use a bicell photodetector to detect the reflectance from the sensor and take the differential signal from the photodetector as the resonance condition. For different analytes, by scanning the DC voltage on the waveguide layer of the sensor chip, the resonance condition can be maintained the same. Under this condition, we record the values of this voltage, namely the resonant voltage. Theoretical calculations and experimental results show the resonant voltage has a highly linear and sensitive response to analyte's refractive index. This method is simple in configuration, and complicated signal processing algorithms can be avoided.

Original languageEnglish (US)
Pages (from-to)26651-26659
Number of pages9
JournalOptics Express
Issue number27
StatePublished - Dec 19 2011
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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