Structure orientation determined in transmission and reflection: q-plate
Abstract
Determination of orientation in the imaged sample/scene has a large application potential when the anisotropy of properties is analysed, usually, under a linearly polarised illumination. This study combined several improvements of microscopy imaging: use of an incoherent white illumination source (a lamp) with a spectral filter to define a spectral window, a plastic circular polariser to image with circularly polarised light (instead of linear), and a 4-pol. camera with integrated polarisers for simultaneous acquisition of images at four pi/4-azimuth shifts. In the transmission mode, a high-fidelity readout of form birefringent optical elements, q-plates, was achieved using a fitting procedure based on the analytical expression of S0 (intensity) Stokes parameters at the pixel level. In the reflection mode, the S0 fit was used to determine the azimuth orientation of the q-plates, as well as a generic Amp x cos(2Q1 - 2Q0) + Offset fit (at pixel level) applied to images taken at four Q1 azimuths. The 4-pol. analysis in reflection under circularly polarised illumination is discussed.
Cite
@article{arxiv.2603.19934,
title = {Structure orientation determined in transmission and reflection: q-plate},
author = {Hsin-Hui Huang and Meguya Ryu and Shuji Kamegaki and Haoran Mu and Eulalia Puig Vilardell and Vijayakumar Anand and Jitraporn Vongsvivut and Nguyen Hoai An Le and Tomas Katkus and Gediminas Seniutinas and Junko Morikawa and Saulius Juodkazis},
journal= {arXiv preprint arXiv:2603.19934},
year = {2026}
}
Comments
8 figures (with more 7 figures in the supplement); 12 pages (main text)