Phase sensitive SPR sensor for wide dynamic range detection |
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Authors: | Huang Y H Ho H P Wu S Y Kong S K Wong W W Shum P |
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Affiliation: | Department of Electronic Engineering, the Chinese University of Hong Kong, Shatin, Hong Kong. |
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Abstract: | Phase detection has been utilized to enhance the sensitivity of surface plasmon resonance (SPR) sensors for a long time. However, an inherent drawback for phase sensitive SPR sensors are their limited dynamic range, which has greatly hindered wide applications of such sensors. In this Letter, a design combining phase detection and angular interrogation has been proposed to provide an SPR sensor with both high sensitivity and wide dynamic range. As a result, a resolution of 2.2×10-7?RIU with a dynamic range of over 0.06?RIU has been achieved simultaneously. An added advantage of this design is the flexibility for sensitivity and dynamic range adjustment. |
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