Integrated-optical sensor and method for integrated-optically sensing a substance
US6429022B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2000 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/7743
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The integrated-optical chemical and/or biochemical sensor comprises a resonant waveguide grating structure (1.1, 1.2, . . . ), e.g., a chirped grating. By illumination with incident light (21), a resonant electromagnetic field is excited in the grating structure (1.1, 1.2, . . . ). At least one parameter of the incident light, e.g., the angle of incidence (&thgr;1) or the wavelength (&lgr;1), is varied. Light (23) excident from the grating structure (1.1, 1.2, . . . ) is detected by detectors (4.1, 4.2, . . . ). Optionally, means for providing a feedback from the detectors (4.1, 4.2, . . . ) to the light sources may be provided, thus establishing a controlled closed-loop system. Hence independent simultaneous measurements in a multiple arrangement of such sensors (S1, S2, . . . ) is made possible. Moreover, a much higher density of sensors (S1, S2, . . . ) results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.