Wavelength-multiplexing phase-sensitive surface plasmon imaging sensor

Yonghong Shao, Yan Li, Dayong Gu, Kai Zhang, Junle Qu, Jianan He, Xuejin Li, Shu Yuen Wu, Ho Pui Ho, Michael Geoffrey Somekh, Hanben Niu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


A wavelength-multiplexing phase-sensitive surface plasmon resonance (SPR) imaging sensor offering wide dynamic detection range and microarray capability is reported. Phase detection is accomplished by performing self-interference between the s- and p- polarizations within the signal beam. A liquid crystal tunable filter is used to sequentially select the SPR excitation wavelength from a white light source. This wavelength-multiplexing approach enables fast detection of the sensor's SPR phase response over a wide range of wavelengths, thereby covering literally any regions of interest within the SPR dip and thus maintaining the highest sensitivity point at all times. The phase-sensitive approach is particularly important for imaging SPR sensing applications because of its less stringent requirements for intensity signal-to-noise ratio, which also means the possibility of using uncooled modest resolution analog-to-digital conversion imaging devices. Experimental results demonstrate a resolution of 2.7 × 10-7RIU with a dynamic range of 0.0138 RIU.
Original languageEnglish
Pages (from-to)1370-1372
Number of pages3
JournalOptics Letters
Issue number9
Publication statusPublished - 1 May 2013
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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