Method for extracting complex refractive index of solid sheet based on terahertz reflectance spectrum

A technology of complex refractive index and reflection spectrum is applied in the field of extracting the complex refractive index of solid thin slices based on terahertz reflection spectrum. , the effect of avoiding mechanical phase shift errors
CN105300920AInactive Publication Date: 2016-02-03BEIJING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING NORMAL UNIVERSITY
Publication Date
2016-02-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for extracting the complex refractive index of a solid sheet based on a terahertz reflectance spectrum. The method comprises the following steps: preparing two solid sheet samples made of the same material, selecting the thin sample as a to-be-measured sample, selecting the thick sample as an auxiliary sample for time-domain signal baseline correction, and measuring the terahertz time-domain reflected signals of both the to-be-measured sample and the auxiliary sample; adopting the difference between the terahertz time-domain reflected signals of the to-be-measured sample and the auxiliary sample as a baseline, and selecting the first and second peaks of the to-be-measured sample as a baseline-corrected reference signal and a baseline-corrected sample signal respectively; conducting compound digital filtering on the baseline-corrected sample signal and the baseline-corrected reference signal separately, so as to remove system echoes and random noise; according to the filtered sample signal and the filtered reference signal, extracting the complex refractive index of the to-be-measured sample in a self-referencing manner.
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Description

technical field

[0001] The present application relates to the fields of photonics technology and electronics technology, and in particular to a method for extracting the complex refractive index of solid flakes based on terahertz reflection spectrum. Background technique

[0002] Terahertz waves generally refer to electromagnetic radiation with a frequency in the range of 0.1 THz to 10 THz (1 THz = 1012 Hz) and a wavelength in the range of 3 mm to 30 μm. Terahertz waves are located between millimeter waves and infrared rays on the electromagnetic spectrum, and belong to the far-infrared band. The position of the terahertz frequency band in the electromagnetic spectrum is as follows: figure 1 As shown, it is the transition area between photonics technology and electronic technology, macroscopic and microcosmic. Terahertz radiation has very important scientific value, and has become a worldwide research hotspot, and is one of the most advanced fields of scientific research in...

Claims

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