Title :
Achromatic micropolarizing filters for visible circular polarization bio-imaging
Author :
Xiaojin Zhao ; Bermak, Amine ; Boussaid, Farid
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
In this paper, we present a bio-inspired achromatic micropolarizing filters for extracting both right-handed and left-handed circularly polarized components of visible light. By assembling two patterned retarder layers with different retardations, the whole structure behaves as a patterned broadband quarter-wavelength retarder (QWR) across the whole visible spectrum with an overall mean square error (MSE) less than 0.01. Compared with previously reported micro-patterned circular-polarizing devices which only work for a very narrow spectrum band, the strict monochromatic requirement for the light source is completely removed. In addition, promising circular polarization-based imaging is made possible for the whole visible spectrum, enabling a wide range of bio-imaging applications, such as skin cancer diagnosis, biopsy and optical coherence tomography (OCT) imaging.
Keywords :
bio-optics; biomedical imaging; mean square error methods; metamaterials; micro-optics; optical filters; optical retarders; achromatic micropolarizing filters; bioinspired achromatic micropolarizing filters; left-handed circularly polarized components; mean square error; monochromatic requirement; optical coherence tomography imaging; patterned broadband quarter-wavelength retarder; right-handed circularly polarized components; skin cancer diagnosis; visible circular polarization bioimaging; Crosstalk; Optical crosstalk; Optical imaging; Optical polarization; Optical sensors; Photodetectors;
Conference_Titel :
Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-61284-856-3
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2011.6026395
