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Method and apparatus for phase-compensated sensitivity-enhanced spectroscopy (PCSES)
Method and apparatus for phase-compensated sensitivity-enhanced spectroscopy (PCSES)
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机译:相位补偿灵敏度增强光谱法(PCSES)的方法和设备
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摘要
A method and apparatus for convolving spectroscopic data with certain phase information for practicing phase-compensated sensitivity-enhanced spectroscopy (PCSES). PCSES uses a beam of radiation in a polarization state PSp from a source emitting at a plurality of wavelengths, and places in the beam a compensator capable of altering polarization state PSp by applying a delimited phase shift Δ between two orthogonal polarization axes of the radiation to restrict a finely-vibrating spectrum. A sample disposed in the beam after the compensator generates a response beam by reflection, transmission or even both. A polarization state PSa of the response beam is passed to a detector to determine a spectrum of the response beam. A first spectrum is collected when polarization states PSp, PSa and the compensator are in a first polarization-altering configuration and a second spectrum is collected when polarization states PSp, PSa and the compensator are in a second polarization-altering configuration. A phase-compensated spectrum is then derived from just the first and second spectra thereby allowing the user to undertake optical characterization, including the measurement of film thickness t and complex indices of refraction n, k of the sample with as few as just two polarization-altering configurations.
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机译:一种用于将光谱数据与某些相位信息进行卷积的方法和设备,用于实施相位补偿的灵敏度增强光谱法(PCSES)。 PCSES使用来自以多种波长发射的光源的偏振状态PS p Sub>的辐射束,并在光束中放置一个能够改变偏振状态PS p Sub>的补偿器。通过在辐射的两个正交极化轴之间施加有限的相移Δ来限制精细振动的光谱。放置在补偿器之后的光束中的样本通过反射,透射或什至两者产生响应光束。响应光束的偏振状态PS a Sub>传递到检测器,以确定响应光束的光谱。当偏振态PS p Sub>,PS a Sub>和补偿器处于第一偏振改变配置时,收集第一光谱,而当偏振态PS p Sub>,PS a Sub>和补偿器处于第二种偏振改变配置。然后,仅从第一光谱和第二光谱中得出相位补偿光谱,从而使用户能够进行光学表征,包括测量薄膜厚度t和样品的复折射率n,k,而偏振仅少两个。更改配置。
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