“It was vital that you us to utilize a kind of graphene that may be built-into the laser system with versatility and control”, stated they, “Ink jet printing together with transfer coating achieved that.”

A terahertz saturable absorber decreases its absorption of sunshine within the terahertz range (far infrared) with growing light intensity and it has great potential to add mass to terahertz lasers, with applications in spectroscopy and imaging. Extremely high-modulation, mode-locked lasers open many prospects in applications where small amount of time scale excitation of specific transitions are essential, for example time-resolved spectroscopy of gasses and molecules, quantum information or ultra-high-speed communication.

Researchers from CNR-Istituto Nanoscienze, Italia and also the College of Cambridge, United kingdom, connected using the ​Graphene Flagship, have proven that you’ll be able to produce a terahertz saturable absorber using graphene, created by liquid phase exfoliation and deposited by transfer coating and inkjet printing. The paper reports a terahertz saturable absorber by having an order of magnitude greater absorption modulation than other devices created up to now.

Graphene based Terahertz Absorbers by Graphene Flagship image

Using mode-locked lasers to create ultra fast pulses within the terahertz range might have intriguing and exciting uses. “These devices might have applications in medical diagnostics when duration of flight topography is worth focusing on – you can visit a tumor in the tissue”.

“We began focusing on saturable terahertz absorbers to resolve the issue of manufacturing a miniaturized mode-locked terahertz laser with thin and versatile integrated components which had good modulation” stated the Graphene Flagship from CNR-Istituto Nanoscienze in Italia.

Graphene is promising for applications like saturable absorbers since it has intrinsic broadband operations and ultrafast time to recover with an easy fabrication and integration, as first shown in ultra-fast infra-red lasers by Flagship partner College of Cambridge. Within the terahertz range, the current work exploits graphene created by liquid phase exfoliation, a technique ideally suitable for mass production, to organize inks, easily deposited by transfer coating or inkjet printing

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