A q-plate 4f system with two off-axis shifts and 45/135-degree polarizers produces intensity equal to the squared phase gradient while suppressing amplitude-edge contributions, shown experimentally with up to 97.6% amplitude reduction.
Isolation of Phase Object in Edge-Enhanced Microscopy with q-plate under Tilted Laser Illumination
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Phase-edge imaging using q-plate shifts for faster and simpler microscopy
A q-plate 4f system with two off-axis shifts and 45/135-degree polarizers produces intensity equal to the squared phase gradient while suppressing amplitude-edge contributions, shown experimentally with up to 97.6% amplitude reduction.