Journal
OPTICS LETTERS
Volume 33, Issue 5, Pages 512-514Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.000512
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Surface-plasmon-resonance (SPR) sensors are widely used in biological, chemical, medical, and environmental sensing. SPR sensors supporting two surface-plasmon modes can differentiate surface binding interactions from bulk index changes at a single sensing location. We present a new approach to dual-mode SPR sensing that offers improved differentiation between surface and bulk effects. By using an angular interrogation, both long- and short-range surface plasmons are simultaneously excited at the same location and wavelength but at different angles. Initial experiments indicate that angular interrogation offers at least a factor of 3.6 improvement in surface and bulk cross-sensitivity compared to wavelength-interrogated dual-mode SPR sensors. (c) 2008 Optical Society of America.
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