We report the realization of a surface plasmon resonance imaging biosensor potentially capable of dynamically
characterizing optical anisotropy by means of polarimetric measurements. Our approach relies on a light beam
propagating through a high refractive index glass-prism (Kretschmann-Raether configuration) in order to excite a surface
plasmon wave along a metal-dielectric interface. This evanescent wave probes the metal-dielectric vicinities with subnanometer
sensitivity, thus resolving optical characteristics of adsorbed biomolecular targets. Fixing wavelength and
angle of incidence of the beam enables real-time monitoring of adsorptions and desorptions of targets onto the whole
surface of the chip, allowing for example characterization of DNA:DNA interaction kinetics with applications to genetic
diagnosis. The polarimetric surface plasmon resonance imaging device uses a pyramid of high index glass and two
orthogonal SPR imaging sensor arms. The interface is probed along two orthogonal directions. A signal difference in
reflection between the two arms should allow us to resolve local optical anisotropy of the dielectric medium, keeping the
parallel and real-time capabilities of the system. Additional information can be obtained by varying the angle of
incidence of the light beam or tuning its wavelength. We believe that this type of sensor will be useful for studying
collective biomolecular assemblies' conformational changes.
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