A low cost CMOS polarimetric ophthalmoscope scheme for cerebral malaria diagnostics

Xiaojin Zhao, Amine Bermak, Farid Boussaid

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this chapter, we present a low cost CMOS polarimetric ophthalmoscope scheme enabling the capture of the retinal abnormalities that are unique to cerebral malaria. The proposed technology, which can be integrated into cellphones, offers the basis for quick and non-invasive screening of cerebral malaria. In addition, we report a micropolarizer array technology exploiting "guest-host" interactions in liquid crystals for visible imaging polarimetry. The proposed technology enables the fabrication of high resolution (5μm x 5μm pixel pitch) micropolarizer arrays with submicron thickness (0.95μm) to provide for larger light collection angles and reduced optical cross-talk. With the "host" nematic liquid crystal molecules photo-aligned by sulfonic azo-dye SD1, we report averaged major principal transmittance and polarization efficiency (PE) of 80.3% and 0.863, respectively across the 400nm - 700nm visible spectrum range. The proposed fabrication technology is simple and cost-effective, requiring only a single ultraviolet-exposure of the spin-coated "guest-host" mixture through a "photoalignment master".

Original languageEnglish
Title of host publicationVLSI-SoC: Advanced Research for Systems on Chip - 19th IFIP WG 10.5/IEEE International Conference on Very Large Scale Integration, VLSI-SoC 2011, Revised Selected Papers
Pages1-9
Number of pages9
Volume379 AICT
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event19th IFIP WG 10.5/IEEE International Conference on Very Large Scale Integration, VLSI-SoC 2011 - Hong Kong, China
Duration: 3 Oct 20115 Oct 2011

Publication series

NameIFIP Advances in Information and Communication Technology
Volume379 AICT
ISSN (Print)18684238

Other

Other19th IFIP WG 10.5/IEEE International Conference on Very Large Scale Integration, VLSI-SoC 2011
CountryChina
CityHong Kong
Period3/10/115/10/11

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Keywords

  • micropolarizer array
  • polarimetric imaging
  • Polarimetric ophthalmoscope

ASJC Scopus subject areas

  • Information Systems and Management

Cite this

Zhao, X., Bermak, A., & Boussaid, F. (2012). A low cost CMOS polarimetric ophthalmoscope scheme for cerebral malaria diagnostics. In VLSI-SoC: Advanced Research for Systems on Chip - 19th IFIP WG 10.5/IEEE International Conference on Very Large Scale Integration, VLSI-SoC 2011, Revised Selected Papers (Vol. 379 AICT, pp. 1-9). (IFIP Advances in Information and Communication Technology; Vol. 379 AICT). https://doi.org/10.1007/978-3-642-32770-4_1