Surface plasmon resonance sensor
An SPR sensor comprising a thin conducting layer comprising at least one conductive element formed on a surface of a transparent substrate, a light source that illuminates an interface between the conducting layer and the substrate, a photosensitive surface that generates signals from light reflected from the interface, a flow cell formed with at least one flow channel having a lumen defined by a wall formed from an elastic material and from a region of the conducting layer, and at least one hollow fluid-providing flow control apparatus having a lumen and an orifice communicating with its lumen. Fluid flow is enabled between the flow channel and the lumen of the flow control apparatus by forcing an end of the flow control apparatus through the elastic material so that the orifice communicates with the flow channel lumen.
1. An SPR sensor comprising:
a thin conducting layer comprising a plurality of conducting elements formed on a surface of a transparent substrate;
an illumination system controllable to illuminate an interface between the conducting layer and the substrate;
a photosensitive surface that generates signals responsive to light from the light source that is reflected from a region of the interface; and
a flow cell formed with at least one flow channel having a lumen defined by a wall, portions of which are formed by regions of at least two of the conducting elements.
2. An SPR sensor according to claim 1 wherein each conductive element is connected to a power source controllable to electrify the conducting element with respect to a reference electrode.
3. An SPR sensor according to claim 2 wherein the plurality of conductive elements comprises a plurality of conducting strips.
4. An SPR sensor according to claim 3 wherein each of the at least one flow channel crosses over each conducting strip.
5. An SPR sensor according to claim 2 wherein the plurality of conductive elements comprises a plurality of conducting pixels.
6. An SPR sensor according to claim 5 wherein each of the at least one flow channel passes over at least one conducing pixel and each pixel lies under a flow channel.
7. An SPR sensor according to claim 2 and comprising an exclusive reference electrode for each conducting element relative to which the conducting element is electrified.
8. An SPR sensor according to claim 2 wherein all the conducting elements are electrified relative to a same reference electrode.
9. An SPR sensor according to claim 2 , comprising at least one reference electrode, located on an external surface of the flow cell, relative to which the conducting elements are electrified.
10. An SPR sensor according to claim 2 , comprising at least one reference electrode, located inside the material from which the flow cell is formed, relative to which the conducting elements are electrified.
11. An SPR sensor according to claim 2 , comprising at least one reference electrode, located on the surface of the substrate, relative to which the conducting elements are electrified.
12. An SPR sensor according to claim 11 wherein the reference electrode is comb shaped having parallel conducting teeth connected to a common backbone.
13. An SPR sensor according to claim 12 wherein the conductive elements are located between the conducting teeth.