Hyperspectral imaging uses the full spectrum of light to give detailed insights on nature and its behavior. These insights open a realm for manifold applications, including autonomous driving, environmental monitoring, health care, space exploration or even agriculture and food processing.
Imaging from the infrared to the terahertz regime poses a technological challenge because it requires devices that are efficient and sensitive enough over the entire range of the spectrum.
However, the need to apply electric field poses enormous difficulties in scaling up the fabrication in three dimensions, which would be necessary to overcome the problem of low absorption of BLG.Twisted"double" bilayer graphene devices , on the other hand, have emerged as a unique material that can avoid these restrictions.
The ultra-broadband photodetector has shown to have a good internal quantum efficiency, an enhancement of photoconductivity by interlayer screening, and scalability of TDBG because no gates are needed to apply the electric field in order to get the electronic bandgap. So, the team put all their efforts into full motion to prepare the experiment. As Hitesh Agarwal, first co-author, recalls"making TDBG samples is not a trivial task. We started from exfoliating flakes of graphene, continuing this process until we could find a big enough flake of bilayer graphene. Then we cut the flake in half with a micromanipulator, pick up one of the halves, rotate it by 15 degrees and stack in onto the other to create a TDBG stack.
The team worked arduous hours to setup the experiment, measure as much as possible to allow them to collect and understand the type of data that they were getting and what it actually meant."One of the big challenges we faced was to actually understand the origin of the large response and benchmark it reliably with commercial technologies" recalls Roshan Krishna Kumar.
Motivated by this tempting prospect, Hitesh Agarwal flew to Switzerland to perform measurements in the lab of Giacomo Scalari, who are experts in terahertz technologies and strong collaborators with ICFO under the project PhotoTBG. Using their customized broadband measurement set-ups, they demonstrated the ultrabroad wavelength range reported in the study.
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