Components Graphene photodetectors integrated on Si IC.

Components Graphene photodetectors integrated on Si IC.

2013/09/26

Graphene photodetectors have been integrated onto a silicon IC at the Vienna University of Technology (VUT).

“There are many materials that can transform light into electrical signals, but graphene allows for a particularly fast conversion”, says the head of VUT’s photonics unit Thomas Müller.

The VUT researchers showed that graphene can absorb light from across the usable spectrum – from 1310nm to 1650nm.

In the VUT chip, “a narrow waveguide with a diameter of about 200 by 500 nanometers carries the optical signal to the graphene layer,” says Muller, “there the light is converted into an electrical signal, which can then be processed in the chip.’

Graphene has a disadvantage in its poor ability to respond to low light intensities.

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