发明名称 |
METHOD AND APPARATUS FOR MEASURING AND MONITORING DISTANCES, PHYSICAL PROPERTIES, AND PHASE CHANGES OF LIGHT REFLECTED FROM A SURFACE BASED ON A RING-RESONATOR |
摘要 |
A method and apparatus for performing refractive index, birefringence and optical activity measurements of a material such as a solid, liquid, gas or thin film is disclosed. The method and apparatus can also be used to measure the properties of a reflecting surface. The disclosed apparatus has an optical ring-resonator in the form of a fiber-loop resonator, or a race-track resonator, or any waveguide-ring or other structure with a closed optical path that constitutes a cavity. A sample is introduced into the optical path of the resonator such that the light in the resonator is transmitted through the sample and relative and/or absolute shifts of the resonance frequencies or changes of the characteristics of the transmission spectrum are observed. A change in the transfer characteristics of the resonant ring, such as a shift of the resonance frequency, is related to a sample's refractive index (refractive indices) and/or change thereof. In the case of birefringence measurements, rings that have modes with two (quasi)-orthogonal (linear or circular) polarization states are used to observe the relative shifts of the resonance frequencies. A reflecting surface may be introduced in a ring resonator. The reflecting surface can be raster-scanned for the purpose of height-profiling surface features. A surface plasmon resonance may be excited and phase changes of resonant light due to binding of analytes to the reflecting surface can be determined in the frequency domain. |
申请公布号 |
WO2006108096(A3) |
申请公布日期 |
2007.10.25 |
申请号 |
WO2006US12805 |
申请日期 |
2006.04.06 |
申请人 |
PRESIDENT AND FELLOWS OF HARVARD COLLEGE;VOLLMER, FRANK;FISCHER, PEER |
发明人 |
VOLLMER, FRANK;FISCHER, PEER |
分类号 |
G01B9/02 |
主分类号 |
G01B9/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|