Phase-edge imaging using q-plate shifts for faster and simpler microscopy
Abstract
We present a simplified method for isolating the edges of a phase object from the edges of an amplitude object using a 4f system with an off-axis q-plate. Instead of the four off-axis shifts of the q-plate required in previous work, we need only two shifts (along +/- x) combined with linear polarizers at 45 degrees and 135 degrees. The number of measurements is reduced by half, potentially doubling the acquisition speed. We derive the theoretical basis, showing that the resulting intensity corresponds to the phase gradient squared, with amplitude-object contributions eliminated. Experiments on two phase-amplitude object samples demonstrate amplitude-edge reduction up to 97.6% and correlation coefficients up to 0.78 (sample 1) and 0.75 (sample 2). In overlapping regions, the phase edge is partially recovered; full recovery would require additional processing such as inverse filtering. This research is useful for biological imaging applications where fast and simple phase-edge isolation is desired.
Versions
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BibTeX
@misc{zangpo2026phaseedge,
title = {{Phase-edge imaging using q-plate shifts for faster and simpler microscopy}},
author = {Jigme Zangpo and Hirokazu Kobayashi and Ryo Yasuhara},
howpublished = {arXiv},
year = {2026},
month = may,
doi = {10.48550/arxiv.2605.21839},
eprint = {2605.21839},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.21839},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Phase-edge imaging using q-plate shifts for faster and simpler microscopy
AU - Jigme Zangpo
AU - Hirokazu Kobayashi
AU - Ryo Yasuhara
PY - 2026
DA - 2026/05/21
PB - arXiv
DO - 10.48550/arxiv.2605.21839
UR - https://arxiv.org/abs/2605.21839
AB - We present a simplified method for isolating the edges of a phase object from the edges of an amplitude object using a 4f system with an off-axis q-plate. Instead of the four off-axis shifts of the q-plate required in previous work, we need only two shifts (along +/- x) combined with linear polarizers at 45 degrees and 135 degrees. The number of measurements is reduced by half, potentially doubling the acquisition speed. We derive the theoretical basis, showing that the resulting intensity corresponds to the phase gradient squared, with amplitude-object contributions eliminated. Experiments on two phase-amplitude object samples demonstrate amplitude-edge reduction up to 97.6% and correlation coefficients up to 0.78 (sample 1) and 0.75 (sample 2). In overlapping regions, the phase edge is partially recovered; full recovery would require additional processing such as inverse filtering. This research is useful for biological imaging applications where fast and simple phase-edge isolation is desired.
ER -