Device and corresponding method for measuring optical rotation of transparent film with periodic chiral structure

Abstract

The invention discloses a device and corresponding method for measuring optical rotation of a transparent film with a periodic chiral structure. The device comprises a measurement light source, a polarizer, a diaphragm and a polarization analyzer, and an optical fiber spectrometer, wherein the polarizer, the diaphragm and the polarization analyzer are sequentially arranged on an optical propagation path of a light beam emitted by the measurement light source, wherein the polarization analyzer is connected with a step motor used for driving the polarization analyzer to rotate, a sample platform with an adjustable position is arranged between the diaphragm and the polarization analyzer, a probe of the optical fiber spectrometer detects light intensity of the light beam passing through the polarization analyzer, and a computer terminal used for displaying a spectrum chart is connected to the output end of the optical fiber spectrometer. The device has the advantages that the optical fiber spectrometer is capable of accurately and rapidly testing the light intensity in real time, the light intensity change caused by the rotation of the polarization analyzer driven by the step motor is accurately observed on the computer terminal, when the light intensity is minimum, the angle of the rotation of the polarization analyzer, driven by the step motor, is the optical rotation of the transparent film with the periodic chiral structure, the measurement process of the optical rotation is simple, and the measurement result is accurate.

Description

technical field [0001] The invention relates to an optical rotation measurement technology, in particular to a device and a corresponding method for measuring the optical rotation of a transparent film with a periodic chiral structure. Background technique [0002] Controlling the polarization (polarization) state of light often plays a vital role in current production, life and scientific research. To effectively control the polarization of light, it is essential to obtain a large degree of optical rotation (that is, the angle of optical rotation). The chiral structure can rotate the polarization plane of the electromagnetic wave passing through it. Typical natural chiral structures include amino acid solutions, quartz crystals, etc.; artificially arranged chiral structures (that is, periodic chiral structures) have great Optical rotation, especially a very thin periodic chiral structure can rotate the polarization plane of light at a large angle, and its optical rotation ...

AI Technical Summary

Problems solved by technology

However, the current existing devices and methods for measuring optical rotation often require the measured object to have a fixed size, and also have certain requirements for the size of the transmitted light spot

Due to the thin thickness and very small structure size of transparent thin films with periodic chiral structures, it is often difficult to measure the optical rotation angle with existing devices and methods for measuring optical rotation.

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