  A multispectral image camera captures image data within specific wavelength
ranges in narrow wavelength bands across the electromagnetic spectrum. Images
from a multispectral camera can extract additional information that the human
eye or a normal camera fails to capture and thus may have important
applications in precision agriculture, forestry, medicine and object
identification. Conventional multispectral cameras are made up of multiple
image sensors each fitted with a narrow passband wavelength filter and optics,
which makes them heavy, bulky, power hungry and very expensive. The multiple
optics also create image co-registration problem. Here, we demonstrate a single
sensor based three band multispectral camera using a narrow spectral band RGB
colour mosaic in a Bayer pattern integrated on a monochrome CMOS sensor. The
narrow band colour mosaic is made of a hybrid combination of plasmonic colour
filters and heterostructured dielectric multilayer. The demonstrated camera
technology has reduced cost, weight, size and power by almost n times (where n
is the number of bands) compared to a conventional multispectral camera.
