A new sensing area for a sensor based on surface plasmon resonance (SPR) was fabricated to detect trace amounts of mercury and lead ions. The gold surface used for SPR measurements were modified with polypyrrole-chitosan (PPy-CHI) conducting polymer composite. The polymer layer was deposited on the gold surface by electrodeposition. This optical sensor was used for monitoring toxic metal ions w...

Gold nanoparticles (Au NPs) with opposite surface charge can form aggregates through electrostatic interaction and exhibit surface plasmon resonance (SPR) induced-localized electromagnetic (EM) field enhancement under light irradiation. Intracellular aggregation of Au NPs can further improve the therapeutic efficiency of Au NP-enhanced photodynamic therapy of cancer by promoting singlet oxygen ...

Very long range surface-enhanced Raman scattering is observed from a nickel nanowire that is separated by 120 nm from a pair of gold nanodisks. The excitation of the surface-plasmon resonance (SPR) from the gold nanodisk pair generates an enhanced electromagnetic field near the nickel segment (SEM, left), leading to Raman intensity greater than the nickel alone (right).

Surface plasmon resonance (SPR) is a versatile, convenient, and low-power technique that may be used to determine the change of thin dielectric film. Although the sensitivity is very high, when small molecule is a target for immobilization or detection, the changes in the angledependent attenuated total reflectance (ATR) are often small so the use of SPR method is limited for generic applicatio...

This work proposes a miniaturized system able to perform multiple cell capture followed by cell-type selective release from a biochip surface. Unlabelled lymphocytes were first specifically captured onto a DNA array by antibody-DNA conjugates. The immobilized cells were subsequently released under spatiotemporal control within local heating generated by intense Surface Plasmon Resonance (SPR) p...

A novel method to generate an integrated electrically contacted glucose dehydrogenase electrode by the surface reconstitution of the apo-enzyme on a pyrroloquinoline quinone (PQQ)-modified polyaniline is described. In situ electrochemical surface plasmon resonance (SPR) is used to characterize the bioelectrocatalytic functions of the system.

We present a unique immobilization technique via physical adsorption/exchange of biomolecules onto a sensing surface of surface plasmon resonance (SPR). The adsorption/exchange is based on competitive bindings of biomolecules to a surface, which does not require a chemical modification of the biomolecules. SPR sensorgrams show that three human serum proteins, albumin, immunoglobulin G (IgG), an...

We describe a novel 'switch-off' biosensing strategy for the detection of chymotrypsin based on surface plasmon resonance (SPR) and surface-enhanced Raman scattering (SERS) spectroscopy. This approach analyzes the fingerprint spectrum of the chymotrypsin-catalyzed substrate. The lowest probed concentration is 0.4 nM for chymotrypsin.

This paper reports the design analysis of a microfabricatable mid-infrared (mid-IR) surface plasmon resonance (SPR) sensor platform. The proposed platform has periodic heavily doped profiles implanted into intrinsic silicon and a thin gold layer deposited on top, making a physically flat grating SPR coupler. A rigorous coupled-wave analysis was conducted to prove the design feasibility, charact...

metallic nanoparticles can exhibit very large optical extinction in the visible spectrum due to localized surface plasmon resonance. spherical plasmonic nanoparticles have been the subject of numerous studies in recent years due to the fact that the scattering response of spheres can be analytically evaluated using mie theory. however a major disadvantage of metallic spherical nanoparticles is ...