A MOS image sensor with a digital-microlens

Kazutoshi Onozawa*, Kimiaki Toshikiyo, Takanori Yogo, Motonori Ishii, Kazuhiko Yamanaka, Toshinobu Matsuno, Daisuke Ueda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We have developed a MOS image sensor with digital-microlenses (DMLs), each of which has an effective refractive index realized by variation of the subwavelength separations between the concentric SiO2 ring walls. The effective refractive index profiles are optimized for the location of each pixel. The light-collection efficiency of the image sensor is twice as high as that of a conventional image sensor because of the enhanced light acceptance in the periphery. A 2.2- μm pitch 3-megapixel MOS image sensor based on the DML technology exhibited excellent uniformity of the light-collection efficiency across the image area, even for light with a very large incident angle, i.e., over 45°. The DML promises new levels of performance of image sensors.

Original languageEnglish
Pages (from-to)986-991
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number4
StatePublished - 1 Apr 2008


  • Effective refractive index
  • Image sensor
  • Microlens
  • Sensitivity
  • Subwavelength structure

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