Promises and challenges of nanoplasmonic devices for refractometric biosensing
Journal article, 2013
Optical biosensors based on surface plasmon resonance (SPR) in metallic thin films are currently standard tools for measuring molecular binding kinetics and affinities - an important task for biophysical studies and pharmaceutical development. Motivated by recent progress in the design and fabrication of metallic nanostructures, such as nanoparticles or nanoholes of various shapes, researchers have been pursuing a new generation of biosensors harnessing tailored plasmonic effects in these engineered nanostructures. Nanoplasmonic devices, while demanding nanofabrication, offer tunability with respect to sensor dimension and physical properties, thereby enabling novel biological interfacing opportunities and extreme miniaturization. Here we provide an integrated overview of refractometric biosensing with nanoplasmonic devices and highlight some recent examples of nanoplasmonic sensors capable of unique functions that are difficult to accomplish with conventional SPR. For example, since the local field strength and spatial distribution can be readily tuned by varying the shape and arrangement of nanostructures, biomolecular interactions can be controlled to occur in regions of high field strength. This may improve signal-to-noise and also enable sensing a small number of molecules. Furthermore, the nanoscale plasmonic sensor elements may, in combination with nanofabrication and materials-selective surface-modifications, make it possible to merge affinity biosensing with nanofluidic liquid handling.
enzyme-linked biosensing
Optical biosensors
single molecule detection
P869
PHYSICAL REVIEW
figure of merit
nanoparticle
WELL CJ
site-specific chemistry
METAL-FILMS
1959
EXTRAORDINARY OPTICAL-TRANSMISSION
surface plasmon resonance
nanoho
SENSING CHARACTERISTICS
NANOPARTICLES
supported lipid bilayer
REAL-TIME
SILVER
SURFACE-PLASMON RESONANCE
NANOHOLE ARRAYS
GOLD-NANOPARTICLE SENSOR
plasmonics
refractometric sensors
SUBWAVELENGTH HOLE ARRAYS
V115
COLLOIDAL GOLD
pore-spanning lipid membrane
Author
Andreas Dahlin
Chalmers, Applied Physics, Bionanophotonics
N. J. Wittenberg
University of Minnesota System
Fredrik Höök
Chalmers, Applied Physics, Biological Physics
S. H. Oh
University of Minnesota System
Seoul National University
Nanophotonics
2192-8606 (eISSN)
Vol. 2 2 83-101Subject Categories (SSIF 2011)
Materials Engineering
Atom and Molecular Physics and Optics
Nano Technology
DOI
10.1515/nanoph-2012-0026