Coupling elements for surface plasmon resonance sensors
US6646744B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Nov 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/553
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides configurations and a method of formation of optical coupling elements for surface plasmon resonance sensors. In the method of the present invention, interference patterns between two overlapping monochromatic coherent light beams are created on a photosensitive film disposed on a master substrate. At least one of the light beams has an oblique angle of incidence onto the master substrate, and the focal points of the two overlapping light beams are positioned in order to reduce optical aberrations up to third order. After developing the photosensitive film, the surface relief patterns pattern created on the master substrate is replicated as diffractive optical element onto SPR sensor chips. The diffractive optical elements working as optical coupling elements diffract an incoming light beam into an oblique angle within the range from 40 to ˜80 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.