Quantitative multispectral biosensing and 1D imaging using quasi-3D plasmonic crystals.
We developed a class of quasi-3D plasmonic crystal that consists of multilayered, regular arrays of subwavelength metal nanostructures. The complex, highly sensitive structure of the optical transmission spectra of these crystals makes them especially well suited for sensing applications. Coupled with quantitative electrodynamics modeling of their optical response, they enable full multiwavelength spectroscopic detection of molecular binding events with sensitivities that correspond to small fractions of a monolayer. The high degree of spatial uniformity of the crystals, formed by a soft nanoimprint technique, provides the ability to image binding events over large areas with micrometer spatial resolution. These features, together with compact form factors, low-cost fabrication procedures, simple readout apparatus, and ability for direct integration into microfluidic networks and arrays, suggest promise for these devices in label-free bioanalytical detection systems.
Stewart
Matthew E
ME
Departments of Chemistry and Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Mack
Nathan H
NH
Malyarchuk
Viktor
V
Soares
Julio A N T
JA
Lee
Tae-Woo
TW
Gray
Stephen K
SK
Nuzzo
Ralph G
RG
Rogers
John A
JA
D001360:Avidin / Q000378:metabolism; D015374:Biosensing Techniques / Q000379:methods*; D001710:Biotin / Q000378:metabolism; D003460:Crystallization; D005340:Fibrinogen / Q000378:metabolism; D021621:Imaging, Three-Dimensional / Q000379:methods*; D049329:Nanostructures; D013057:Spectrum Analysis / Q000379:methods*
D001360:Avidin; D001710:Biotin; D005340:Fibrinogen