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Ultracompact Camera Pixel with Integrated Plasmonic Color Filters
Author(s) -
Panchenko Evgeniy,
Wesemann Lukas,
Gómez Daniel E.,
James Timothy D.,
Davis Timothy J.,
Roberts Ann
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201900893
Subject(s) - photodetector , materials science , image sensor , color filter array , optoelectronics , pixel , plasmon , process (computing) , fabrication , computer science , optics , color gel , computer vision , nanotechnology , layer (electronics) , physics , medicine , alternative medicine , pathology , operating system , thin film transistor
Photodetector size imposes a fundamental limit on the amount of information that can be recorded by an image sensor. Compact, high‐resolution sensors are generally preferred for portable electronic devices such as mobile phones and digital cameras, and as a result, a significant effort has been invested in improving the image quality provided by small‐area image sensors. Reducing photodetector size, however, still faces challenges in implementation requiring improvements in current technology to meet the demand for ultracompact imaging systems such as cameras. An issue with a decrease in size is associated with photodetectors utilizing color filters. In most commonly used camera designs these filters are made of dyes or pigments and incompatible with the complementary metal‐oxide‐semiconductor fabrication process. They are, therefore, fabricated in two different technological processes and require subsequent alignment. As the pixel size decreases, the alignment of these layers becomes challenging. Furthermore, dye‐based filters need to have a thickness of the order of micrometers to ensure sufficient absorption. Here a compact, low‐cost color sensor is proposed and experimentally demonstrated utilizing monolithically integrated plasmonic antennas that have a nanoscale thickness and are fabricated in the same technological process with photodetector matrix.