Journal of Nanomedicine & Nanotechnology

Room temperature polariton lasers and Bose-Einstein condensation in wide bandgap semiconductor nanowires

3^rd International Conference on Nanotek & Expo

December 02-04, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Ayan Das

Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

Bose-Einstein condensation is a dramatic phenomenon in which many particles act as though they were a single entity. The first Bose-Einstein condensate produced in the laboratory used rubidium atoms at very cold temperatures?works that was awarded the 2001 Nobel Prize in physics. Other materials, like superconductors, exhibit similar behavior through particle interactions. These systems typically require temperatures near absolute zero. But we have now used a nanoscale wire to produce an excitation known as a polariton. These polaritons formed a Bose-Einstein condensate at room temperature, potentially opening up a new avenue for studying systems that otherwise require expensive cooling and trapping. In this process, we also demonstrate lasing at an ultra-low threshold that is three orders of magnitude lower than any conventional lasers. This opens up a wide range of potential applications in daily consumer goods to quantum computers. The active medium is a single GaN nanowire which is 700 nm in length and has a diameter of 60 nm and is free of extended defects, has no alloy fluctuation to introduce inhomogeneous broadening, has a small surface recombination velocity, very small surface depletion and thus is easily reproducible. The structure is easy to fabricate and has a large Rabi splitting originating from large exciton oscillator strength and a modified cavity field that concentrates within the nanowire

Biography :

Ayan Das has completed his Ph.D. from University of Michigan, Ann Arbor in 2013 and is currently a senior metrology engineer at Intel Labs in Oregon. He is a fellow of APS and IEEE Photonics society; he has published more than 25 journal and conference papers in reputed peer-reviewed journals. His research area includes quantum nanophotonics and nanoopto-electronics and is the first to demonstrate Bose-Einstein condensation at room temperature and electrically powered polariton lasers that can reduce the energy efficiency of lasers by three orders of magnitude.