Berkeley's new 2D laser find steps toward next-gen ultra-compact photonic devices

Devices are getting smaller and becoming more compact every day while there computation power is increasing, credit goes to research and development. The first baby computer was the size of a small room that too with just 8 bit of memory, but researchers have brought computing devices million times better on your laps and in hand in the form of laptops, smartphones and tablets, needless to they are compact.

In a breakthrough research, scientists at the renowned Berkeley Lab in the US have taken another step towards making next-generation optoelectronics devices and photonic devices with the help of 2D laser which will make these devices ultra compact in coming future. To achieve bright excitonic lasing at visible light wavelengths, researcher embedded a monolayer of tungsten disulfide into a special microdisk resonator.

Lead researcher Xiang Zhang from the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) said that embedding single layer of tungsten disulfide to achieve high-quality exciton lasing is a big leap in making high-performance computing application and optical communication using 2D on-chip optoelectronics.

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) is one of the most talked material (2D semiconductor) among nanotech scientists due to very high energy efficiency and ability to conduct electrons faster when compared to silicon. Graphene is also a well-known 2D semiconductor, but TMDCs has an edge due to natural bandgaps that pave the way for their electrical conductance to be switched on and off easily.

Now, a single layer of tungsten disulfide is the most promising TMDCs in revolutionizing the optoelectronic devices. Also, it can be used in encoding digital information in the spin. Zhang said that researchers didn’t know in the past that lasing or coherent light emission crucial for on-chip applications can be used in TMDCs. He further added that TMDCs have shown exceptionally strong light-matter interactions that result in extraordinary excitonic properties

The study was published in the Nature Photonics.

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