Enhancement of the depth-of-field of integral imaging microscope by using switchable bifocal liquid-crystalline polymer micro lens array
Posted on 2017-11-20 - 15:30
An integral imaging microscopy (IIM) system with improved depth-of-field (DoF) using a custom-designed bifocal polarization-dependent liquid-crystalline polymer micro lens array (LCP-MLA) is proposed. The implemented MLA has improved electro-optical properties such as a small focal ratio, high fill factor, low driving voltage, and fast switching speed, utilizing a well-aligned reactive mesogen on the imprinted reverse shape of the lens and a polarization switching layer. A bifocal MLA switches its focal length according to the polarization angle and acquires different DoF information of the specimen. After two elemental image arrays are captured, the depth-slices are reconstructed and combined to provide a widened DoF. The fabricated bifocal MLA consists of two identical polarization-dependent LCP-MLAs with 1.6 mm and f/16 focal ratio. Our experimental results confirmed that the proposed system improves the DoF of IIM without the need for mechanical manipulation.
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Kwon, Ki-Chul; Erdenebat, Munkh-Uchral; Lim, Young-Tae; Joo, Kyung-Il; Park, Min-Kyu; Park, Heewon; et al. (2017). Enhancement of the depth-of-field of integral imaging microscope by using switchable bifocal liquid-crystalline polymer micro lens array. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.3930583.v1
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AUTHORS (9)
KK
Ki-Chul Kwon
ME
Munkh-Uchral Erdenebat
YL
Young-Tae Lim
KJ
Kyung-Il Joo
MP
Min-Kyu Park
HP
Heewon Park
JJ
Jong-Rae Jeong
HK
Hak Rin Kim
NK
Nam Kim