Thursday, February 06, 2020

Graphene 3D Sensor

Physics World publishes an article "Transparent graphene photodetectors make advanced 3D camera" that proposes to use a set of sensors for depth perception:

A team of researchers led by Zhaohui Zhong, Jeffrey Fessler and Theodore Norris from the University of Michigan built a 3D camera that uses a stack of transparent sensors made from graphene to simultaneously capture images that are focused to different distances from the camera lens.

The researchers fabricated their photodetector on a transparent glass substrate using graphene as the light-sensing layer, the conducting channel layer, the gate layer and even the interconnects. Using graphene for all the different functional components of the device in this way allows for sensitive light detection and a transparency of around 95%.


  1. Sensitive light detection and 95% transparency do not go well together. Am I missing something?

    1. 95% transparency is for one graphene film. They talk about up to 20 films stacked together. This should make it a better light absorber.

  2. So far, they have built single point detectors, not arrays. There is still a long way to go to have something really useful.
    I guess that the concept of multiple semi-transparent sensors could also be applied with thinned silicon sensors, using and IR active light source. Not straightforward to build, but higher TRL.


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