Systems and methods for chiroptical heterodyning
US7405826B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jun 29, 2005 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Sep 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/218
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for improved detection of a chiral property of a sample begins with a probe beam of light having a first modulation frequency ω and is further modulated with a second modulation frequency φ. A non-linear photo-detector, which may include multiple detector portions to form a balanced receiver, mixes the first modulation with the second modulation to analyze frequency components at inter-modulated sidebands, where the level of the inter-modulated sidebands are related to the chiroptical property of the sample. The inter-modulated sidebands may be the additive sidebands or the subtractive sidebands. A lock-in detector can be used to receive a signal output from the non-linear photo-detector and generate the modulation signals at the different modulating frequencies. Furthermore, the non-linear photo-detector may analyze a ratio of the inter-modulated sideband levels, such as (φ+2ω)/(φ+ω), to yield a signal that is linearly related to the chiral property of the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.