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Sub-λ Optoelectronics: Physics and Device Principles

Event Details

Event Dates: 

Monday, December 9, 2013 - 4:00pm

Seminar Location: 

  • Engineering Building Room ECCR 105

Speaker Name(s): 

Xiaobo Yin

Speaker Affiliation(s): 

University of Colorado Boulder
Seminar Type/Subject

Scientific Seminar Type: 

  • COSI Seminar

Event Details & Abstract: 

The rapid development of nanoscale science and technology not only permits the exploration of advanced scientific ideas and observation of unprecedented phenomena, but also offers the practical solutions to the world’s most serious issues such as energy and pollution crises, health and food safety concerns, as well as military and homeland security needs. Countless applications have been developed to store energy at unmatched capacities, to sense contaminants at single molecule levels, and to shrink and accelerate computing and communication devices meeting the ever-exploding demands for data traffic.

This talk will focus on how judicious materials/structures design and quantum engineering tailor and eventually control the light-matter interactions at the deep-sub-wavelength scale. In particular, I will illustrate these design principles by using examples of multiplexed plasmon lasers, high-speed graphene modulators and photoreceivers that are sensitive to the helicity of light. For example, all nanoscale light sources suffer from their strongly divergent emissions, preventing the practical utilization. I will elaborate the strategies to harvest substantial amount of light emissions from a sub-wavelength cavity and to achieve close-to-unit multiplexing efficiency, making plasmon nanolasers viable solution as integrated light sources. These nanolasers can even perform much brighter and faster when quantum engineering in temporal domain is further employed. More interestingly, introducing emerging quantum materials, such as graphene and valleytronic Molybdenum Disulphide into nanophotonic platforms opens new horizons of research and applications. Throughout this talk I will be discussing how this unique approach defines new families of optoelectronic devices by exploiting the unique physics that is only viable in these materials systems.