Polarimeter using quantum well stacks separated by gratings
US6906800B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2003 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Dec 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J4/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Quantum well stacks are used in combination with linear gratings to determine the degree of polarization of incident light in terms of Stokes parameters. Interference from multiple reflections, diffractions and transmissions of the light propagating from and through the linear gratings modulates the absorption of the ±1-diffracted orders at each quantum well stack.Each quantum well stack is included in separate circuit having a voltage bias and a current meter. The voltage bias across each circuit is individually adjusted, and the photocurrent in each circuit, as measured by the respective current meter, is proportional to the flux of light absorbed by the respective quantum well stack. The four photocurrents are linearly mapped to the four Stokes parameters, which, in turn, represent the polarization of the incident light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.