A research team at the University of Manchester in the UK developed a tunable THz laser using the unique properties of graphene plasmas. The research, published in Science, describes the team's experimental approach, the four prototypes produced, the effects of lasers and their plans to apply new technologies to available equipment. In the same period, Marco Poli and IIT made some comments on the work of the research team and provided some comments on the areas where the technology may play an important role.
Lasers operating in the terahertz range can be used in a variety of applications because their light beams can pass through the garment or cover. This laser has been made, but so far only one fixed wavelength has limited its usefulness in real world conditions. The new study by the British research group found a way to tune the wavelength of a terahertz laser and perhaps change the status of the terahertz laser.
In order to develop a new laser, the team used graphene to replace the metal in lasers because the wavelength of graphene can be changed in the electric field. They began placing on the substrate through a series of gallium aluminum gallium arsenide quantum dots and gallium arsenide wells of different thicknesses, which were then covered with a waveguide made of gold. Placing a layer of graphene on the top of the gold layer, researchers reduced the cracks to force electrons through the tunnel between the wells. The sandwich structure was finally covered with a polymer electrolyte and the laser tuned using a cantilever beam.
The experiment produced a device that produces a terahertz beam, but could not be used in everyday applications. The team also prepared four prototypes and tested the prototypes under various conditions. The team believes these devices, which they call "proof-of-concept," can be modified for voltage control to fit each slit, which will make the device much more regulated. In addition, Polly pointed out the problem that the polymer prevents the tip of the back of the cantilever from getting close enough to the graphene sheet, hindering precise control.
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