Phase sensitive array detection with polarisation modulated differential sensing

I. R. Hooper, J. R. Sambles, M. C. Pitter, Michael Geoffrey Somekh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


It has recently been shown that polarisation modulated differential surface plasmon sensing can be used to monitor refractive index changes of approximately 2 × 10-7refractive index units. The information for these measurements is carried by a small-modulated light component and a relatively large constant background signal. These measurements have, hitherto, only been carried out as point measurements. In this paper we demonstrate that multipoint measurements can be obtained using a CMOS camera array that directly detects the amplitude and phase of the oscillating component of the light. The effectiveness of the parallel measurement is demonstrated by monitoring the changes in a waveguide mode as the refractive index of the dielectric layer is changed by exposure to ultraviolet radiation. This paper demonstrates the potential of phase sensitive CMOS detection in applications where spatially resolved differential imaging is required, especially in the field of chemical and biological sensing.
Original languageEnglish
Pages (from-to)651-655
Number of pages5
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 7 Dec 2006
Externally publishedYes


  • Array detection
  • Biosensor
  • Optical sensor

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering


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