Transparent anisotropic films measurement with a polarized angle-resolved spectroscopy

Lihua Peng, Dawei Tang, Jian Wang, Long Xu, Wenlong Lu, Rong Chen, Liping Zhou

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Polarized angle-resolved spectroscopy is introduced to measure transparent anisotropic films with back focal plane imaging by virtue of its rich information provided at various incident and azimuthal angles. The polarized angle-resolved spectroscopy provides a conoscopic interferogram and angle-resolved spectrum to deal with the complex characterization parameters of an anisotropic film, including the thickness, principal refractive index, and optical axis. Firstly, the optics model of a transparent anisotropic film is built by superpositioning the incoherent waves from the front and rear surfaces with coherency matrices formalism when the optical length is larger than the coherent length, and the incoherent issue arises. Then the optical axis of the anisotropic sample can be determined by the conoscopic interference image with the melatope, which marks zero phase difference between the ordinary and extraordinary waves. The measured angle-resolved reflectance spectrum and anisotropic interference phase are fitted to the optics model of the film with coherency matrix formalism, utilizing the Levenberg-Marquardt algorithm to calculate the thickness and dispersion principal refractive index within a single shot. The thickness and anisotropic refractive index are determined for sapphire and polyethylene terephthalate (PET) samples with our homemade polarized angle-resolved spectrometer. The thickness measurement results show that the relative error of the proposed method is less than 1.45%.
Original languageEnglish
Title of host publicationInternational Conference on Optical and Photonic Engineering (icOPEN 2022)
EditorsChao Zuo, Shijie Feng, Haixia Wang, Qian Kemao
Number of pages6
ISBN (Electronic) 9781510661912
ISBN (Print)9781510661905
Publication statusPublished - 27 Jan 2023
EventInternational Conference on Optical and Photonic Engineering 2022 - Online, China
Duration: 24 Nov 202227 Nov 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceInternational Conference on Optical and Photonic Engineering 2022
Abbreviated title icOPEN 2022
Internet address


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