Sensor and associated methods
US10753868B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2017 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Jun 16, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/218
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a chirped diffractive element (20) in the form of a grating (22) configured for supporting a plurality of guided mode resonances (54), which resonances (54) may be considered to comprise a standing wave. Chirping the grating (22) may allow guided mode resonances (54) to be distinguishable in terms of position within a section (34) the grating (22). An incident electromagnetic field may be coupled into at least one of the sections (34) when the electromagnetic field has a wavelength value within a predetermined wavelength range and a sample has a refractive index value within a predetermined index range. The incident electromagnetic field may be reflected by at least one of the sections (34) of the grating (22) exhibiting a guided mode resonance (54). The reflected electromagnetic field from the section (34) can then be detected by directly imaging the grating (22), thereby revealing the position of the exhibited guided mode resonance (54) in the grating (22), and thereby inferring the refractive index value of the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.