High resolution surface plasmon resonance sensor and sensor system thereof
AssigneeKorea Institute of Science and Technology
InventorsKyeong Seok Lee, Won Mok Kim, Taek Sung Lee, Byung Ki Cheong
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Abstract
Provided is a surface plasmon resonance sensor including: a part of delivering light by which a signal beam is incident to generate an evanescent field; and a part of exciting surface plasmon for exciting surface plasmons by the generated evanescent field and giving rise to a surface plasmon resonance, wherein a dielectric waveguide layer is inserted between metal layers of the part of exciting surface plasmon, and surface plasmon resonance properties are changed by an object to be analyzed.
Claims16
A surface plasmon resonance generator comprising:
- a prism by which an incident light beam is directed to a surface plasmon generator stack for generating an evanescent field at an interface of the prism and the surface plasmon generator stack, the prism having two sides and a base;
- and
- the surface plasmon generator stack including:
- an inner metal layer having a first surface and a second surface, the first surface in contact with the base of the prism;
- a dielectric waveguide in contact with the second surface of the inner metal layer;
- and
- an outer metal layer having a third surface in contact with the dielectric waveguide and a fourth surface adjacent to a surface of an analyte,
- wherein the surface plasmon generator stack gives rise to propagating surface plasmons of a surface plasmon resonance at the outer metal layer by the evanescent field;
- and
- wherein the surface plasmon resonance properties of the surface plasmon generator stack are changed by the analyte disposed on the fourth surface of the outer metal layer, and the responsivity of the plasmon resonance of the surface plasmon generator stack is controlled by controlling a thickness ratio of a first thickness of the inner metal layer to a second thickness of the outer metal layer;
- and
- wherein a refractive index of the dielectric waveguide is greater than that of the prism.
A surface plasmon resonance sensor system comprising:
- a light source for providing a signal beam to generate surface plasmons;
- a surface plasmon resonance sensor of which surface plasmon resonance properties are changed by an analyte to be analyzed;
- and
- a light detector for measuring a reflected beam which experiences surface plasmon resonance and emerges from the surface plasmon resonance sensor,
- wherein the surface plasmon resonance sensor includes:
- a prism by which the signal beam is propagated to form an evanescent field at an interface of the prism and a surface plasmon generator stack, the prism having a base;
- the surface plasmon generator stack including:
- an inner metal layer having a first surface and a second surface, the first surface in contact with the base of the prism;
- a dielectric waveguide in contact with the second surface of the inner metal layer and
- an outer metal layer having a third surface in contact with the dielectric waveguide and fourth surface adjacent to a surface of the analyte to be analyzed,
- wherein the surface plasmon generator stack gives rise to propagating surface plasmons of a surface plasmon resonance at the outer metal layer by the evanescent field, and the surface plasmon resonance properties of the surface plasmon generator stack are changed by the analyte disposed on the fourth surface of the outer metal layer, and the responsivity of the plasmon resonance is controlled by controlling a thickness ratio of a first thickness of the inner metal layer to a second thickness of the outer metal layer;
- and
- wherein a refractive index of the dielectric waveguide is greater than that of the prism.
Dependencies are inferred from the claim text.