Sensitive biosensor array using surface plasmon resonance on metallic nanoslits.
Chip-based biosensor arrays for label-free and high-throughput detection were fabricated and tested. The sensor array was composed of a 150-nm-thick, 50-nm-gap, and 600-nm-period gold nanoslits. Each array size was 100 mumx100 mum. A transverse-magnetic polarized wave in these metallic nanostructures generated resonant surface plasmons at a wavelength of about 800 nm in a water environment. Using the resonant wavelength shift in the nanoslit array, we achieved detection sensitivity up to 668 nm per refractive index unit, about 1.7 times larger than that reported on an array of nanoholes. An antigen-antibody interaction experiment in an aqueous environment verified the sensitivity in a surface binding event.
Lee
Kuang-Li
KL
Academia Sinica, Research Center for Applied Sciences, 128 Section 2, Academia Road, Nankang, Taipei 11529, Taiwan.
Lee
Chia-Wei
CW
Wang
Way-Seen
WS
Wei
Pei-Kuen
PK
D001704:Biopolymers / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D008670:Metals / Q000737:chemistry; D010783:Photometry / Q000295:instrumentation* / Q000379:methods; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods
D001704:Biopolymers; D008670:Metals