Wavelength optical filter structure and associated image sensor
US8675280B2 · kind B2 · utility
3Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2009 |
| Grant date | Mar 18, 2014 |
| Priority date | — |
| Expiry date | May 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/182
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an optical filter structure composed of at least two adjacent elementary optical filters, an elementary optical filter being centred on an optimum transmission frequency, characterised in that it comprises a stack of n metallic layers (m1-m3) and n−1 dielectric layers (d2-d3), each metallic layer alternating with a dielectric layer such that the central layer in the stack is a metallic layer (m2), each of the layers in the stack having a constant thickness except for the central metallic layer for which the varying thickness fixes the optimum transmission frequency of an elementary filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.