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Wavelength-multiplexing phase-sensitive surface plasmon imaging sensor.
|Title||Wavelength-multiplexing phase-sensitive surface plasmon imaging sensor.|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Shao Y, Li Y, Gu D, Zhang K, Qu J, He J, Li X, Wu S-Y, Ho H-P, Somekh MG, Niu H|
|Date Published||2013 May 1|
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(-7) RIU with a dynamic range of 0.0138 RIU.
|Alternate Journal||Opt Lett|