Abstract
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 language | English |
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Pages (from-to) | 1370-1372 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 38 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1 May 2013 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics