Optical Efficiency Enhancement of Nanojet-Based Dielectric Double-Material Color Splitters for Image Sensor Applications

We propose a new type of color splitter, which guides a selected bandwidth of incident light towards the proper photosensitive area of the image sensor by exploiting the nanojet (NJ) beam phenomenon. Such splitting can be performed as an alternative to filtering out part of the received light on eac...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-11, Vol.11 (11), p.3036
Main Authors: Shramkova, Oksana, Drazic, Valter, Varghese, Bobin, Blondé, Laurent, Allié, Valerie
Format: Article
Language:English
Subjects:
CMOS
Color
color splitter
Crosstalk
double material element
Efficiency
Engineering Sciences
Image enhancement
Image processing
image sensor
Incident light
Light
light diffraction
NJ beam deflection
Optics
Photonic
Photosensitivity
Radiation
Sensors
Silicon
Smartphones
Splitting
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Summary:We propose a new type of color splitter, which guides a selected bandwidth of incident light towards the proper photosensitive area of the image sensor by exploiting the nanojet (NJ) beam phenomenon. Such splitting can be performed as an alternative to filtering out part of the received light on each color subpixel. We propose to split the incoming light thanks to a new type of NJ-based near-field focusing double-material element with an insert. To suppress crosstalk, we use a Deep-Trench Isolation (DTI) structure. We demonstrate that the use of a dielectric insert block allows for reduction in the size of the color splitting element. By changing the position of the DTI, the functionality of separating blue, green and red light can be improved.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano11113036