SPR sensor device with nanostructure

摘要

A sensor device comprises a dielectric substrate (52); and a metal layer (53) on the substrate (52) with at least one array of cavities (54) therein and adapted to support L-SPR, each of the cavities (54) in the metal layer (53) having an opening (56) and a closed bottom (58) and widening from opening to bottom. A bed of dielectric material (62) is provided over the bottom (58) of each cavity (54) to reduce its apparent depth, the bed surface (62) being functionalized to bind to receptor moieties (64). This sensor device is particularly designed for SPR detection, but can be used in other detection techniques.

主权项

1. A sensor device comprising:
a dielectric substrate; a metal layer on said substrate with at least one array of nano-cavities therein and adapted to support L-SPR, each of said cavities of the at least one array of nano-cavities in said metal layer having a depth, an opening and a closed bottom and widening from opening to bottom in order to form a strong electrical field pattern around the cavity opening; wherein a bed of dielectric material having a thickness that is less than the depth of said cavities is provided over the bottom of each cavity of the at least one array of nano-cavities to form a reduced, apparent depth, the bed surface being functionalized to bind to receptor moieties; wherein the thickness of said dielectric bed is designed such that upon binding of an analyte to said receptor moieties, said analyte is at least partially located in the region of strong electric field.