Tunable terahertz achromatic wave plate and a terahertz achromatic range tuning method
US10353245B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2016 |
| Grant date | Jul 16, 2019 |
| Priority date | — |
| Expiry date | Sep 27, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A tunable terahertz achromatic wave plate including at least three phase retarders and a tuning device is provided. The at least three phase retarders are sequentially arranged along a first direction, and configured to provide an achromatic range in a terahertz band, so as to reduce a chromatic aberration of a terahertz wave through the tunable terahertz achromatic wave plate in the achromatic range. The at least three phase retarders respectively include a liquid crystal cell. The tuning device is configured to tune a liquid crystal orientation angle of the liquid crystal cell, so as to correspondingly change a birefringence of the at least three phase retarders in the terahertz band. The terahertz wave through the tunable terahertz achromatic wave plate has same phase retardation in the achromatic range. The achromatic range in the terahertz band is determined according to the birefringence of the at least three phase retarders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.