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Quantitative phase imaging by pupil modulation different phase contrast (PMDPC)

Lu, Hangwen and Chung, Jaebum and Ou, Xiaoze and Yang, Changhuei (2017) Quantitative phase imaging by pupil modulation different phase contrast (PMDPC). In: Quantitative Phase Imaging III. Proceedings of SPIE. No.10074. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 100740P. ISBN 9781510605893.

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Differential phase contrast (DPC) is a non-interference quantitative phase imaging method achieved by asymmetric optical systems. Quantitative DPC images are achieved previously with asymmetric illumination systems. However, it works well for on-focus thin samples only. Considering the limitation, we develop a pupil modulation differential phase contrast (PMDPC) imaging method. Instead of modulating the illumination, we use a spatial light modulator (SLM) to modulate a 4f imaging system’s pupil plane. When half of the pupil plane is blocked by the SLM, a phase gradient image forms on the image plane. Using two such phase gradient images captured separately by applying complementary half-circle pupils on SLM, a DPC image can be constructed that carries the sample’s phase information. A quantitative phase image of the sample can be reconstructed after a deconvolution procedure. Further, we are able to combine this quantitative phase with the sample’s intensity image to obtain the complete complex object field which then allows us to post-process the image. We report experimentally that aberrations arising from the optical elements in the system can be corrected by deconvolving the reconstructed image with a pre-calibrated pupil function. We can also digitally extend the depth of field using angular spectrum propagation algorithm. With our PMDPC imaging setup where NA equals to 0.36, a quantitative phase image with periodic resolution of 1.73µm is obtained. The depth of field for a 20x, 0.4NA objective is extended digitally by 20 times to -50~50 micrometers.

Item Type:Book Section
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URLURL TypeDescription
Chung, Jaebum0000-0003-3932-8428
Yang, Changhuei0000-0001-8791-0354
Additional Information:© 2017 Society of Photo-optical Instrumentation Engineers (SPIE).
Series Name:Proceedings of SPIE
Issue or Number:10074
Record Number:CaltechAUTHORS:20180717-082347539
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Official Citation:Hangwen Lu, Jaebum Chung, Xiaoze Ou, Changhuei Yang, "Quantitative phase imaging by pupil modulation different phase contrast (PMDPC) (Conference Presentation)", Proc. SPIE 10074, Quantitative Phase Imaging III, 100740P (24 April 2017); doi: 10.1117/12.2252576;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87910
Deposited By: Tony Diaz
Deposited On:17 Jul 2018 18:49
Last Modified:09 Mar 2020 13:18

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