Multiplexed plasmonic sensing based on small-dimension nanohole arrays and intensity interrogation.
We performed multiplexed sensing on nanohole array devices to simultaneously obtain information on molecular absorption, scattering, and refractive-index change, which were distinguished by using different array structures with distinct optical behavior. Up to 25 arrays were fabricated within a 65 microm x 50 microm area to provide real-time information of the local surface environment. The performance of multiplexed sensing was examined by flowing NaCl, Coomassie blue, bovine serum albumin, and liposome solutions that exhibit different visible light absorption/scattering properties and different refractive indices. Experimental artifacts from light source fluctuation, sample injections, and light scattering induced by aggregates in solutions were detected by monitoring superwavelength holes or nanohole arrays with different periodicity and hole diameters.
Yang
Jiun-Chan
JC
Department of Biochemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.
Ji
Jin
J
Hogle
James M
JM
Larson
Dale N
DN
D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation*; D016062:Porosity; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation*