Metrology of complex refractive index for solids in the terahertz regime using frequency domain spectroscopy
Metrology of complex refractive index for solids in the terahertz regime using frequency domain spectroscopy
复制标题
使用频域光谱测量太赫兹范围内固体的复折射率
DOI:
10.1088/1681-7575/aae2c9
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发表时间:
2018
期刊:
影响因子:
2.4
通讯作者:
Chick S
中科院分区:
文献类型:
--
作者:
Chick S
Frequency domain spectroscopy allows an experimenter to establish optical properties of solids in a wide frequency band including the technically challenging 10 THz region, and in other bands enabling metrological comparison between competing techniques. We advance a method for extracting the optical properties of high-index solids using only transmission-mode frequency domain spectroscopy of plane-parallel Fabry–Perot optical flats. We show that different data processing techniques yield different kinds of systematic error, and that some commonly used techniques have inherent systematic errors which are underappreciated. We use model datasets to cross-compare algorithms in isolation from experimental errors, and propose a new algorithm which has qualitatively different systematic errors to its competitors. We show that our proposal is more robust to experimental non-idealities such as noise or apodization, and extract the complex refractive index spectrum of crystalline silicon as a practical example. Finally, we advance the idea that algorithms are complementary rather than competitive, and should be used together as part of a toolbox for better metrology.
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