High-resolution surface plasmon microscope with heterodyne interferometry in radial polarization mode
US8610897B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 11, 2008 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | May 28, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/067
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a high-resolution scanning surface-plasmon microscope including a source (LG) of coherent light and a medium for coupling and confining a surface plasmon including an objective (O, OM) with a large numerical aperture, immersion oil (Hi), and a glass cover slip (GS). A metal layer (MS) covers a surface of the glass cover slip (GS). The microscope also includes a heterodyne-mode Twyman-Green interferometer placed between the light source and means (PL1, PL2, EC) for scanning the metal layer using a light beam and means (PD) for detecting the beam from the interferometer connected to processing means (S, F, DTec, COMP) for forming an image from that beam. According to the invention, at least one polarization converter (CP) for converting the light beams (L) emitted by the light source (LG) from linear polarization to radial polarization is disposed between the light source and the interferometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.