Quantum Dots-Upcoming Data Transmission

Fiber-optic cables package everything from financial data to cat videos into light, but when the signal arrives at your local data center, it runs into a silicon bottleneck.

To break through, scientists have been developing lasers that work on silicon based layers may be in Quantum dots.

Laser could save a 20-75 percent energy than electronic component.

Silicon doesn’t have right properties for lasers so  a class of materials from Groups III and V of the periodic table because these materials can be integrated with silicon.

QUANTUM DOTS:

Quantum dots can be easily grown directly on Silicon. Quantum dots are semiconductor particles only a few nanometers wide small enough that they behave like individual atoms.

 When driven with electrical current, electrons and positively charged holes become confined in the dots and recombine to emit light a property that can be exploited to make lasers.

The researchers made their III-V quantum-dot lasers using a technique called Molecular beam epitaxy.

They deposit the III-V material onto the silicon substrate, and its atoms self-assemble into a crystalline structure. But the crystal structure of silicon differs from III-V materials, leading to defects that allow electrons and holes to escape, degrading performance.

 Fortunately, because quantum dots are packed together at high densities more than 50 billion dots per square centimeter they capture electrons and holes before the particles are lost.

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