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Seminar by Mercedeh Khajavikhan
Wednesday, June 13, 2012 - 11:00am
Location: Fung Auditorium
Thresholdless Nanoscale Lasers
Mercedeh Khajavikhan, Ph.D.
Staff Researcher, Department of Electrical and Computer Engineering, U. C. San Diego
Abstract: The applications of nano-lasers range from on-chip optical communication to high-resolution and high-throughput imaging, sensing and spectroscopy. This has fueled interest in developing the ‘ultimate’ nano-laser: a scalable, low-threshold source of radiation that operates at room temperature and occupies a small volume on a chip. However, progress towards realizing this ultimate nano-laser has been hindered by the lack of a systematic approach to scaling down the size of the laser cavity without significantly increasing the threshold power required for lasing.
In this talk, I present our experimental findings about lasing in the newly introduced nanoscale, sub-wavelength in all three dimensions, coaxial cavities that potentially solve the resonator scalability challenge by the choice of geometry and metal composition. In particular, I discuss the design, fabrication, characterization, and analysis that resulted in the smallest, room-temperature, continuous wave, telecommunication wavelength laser to date. Furthermore, by utilizing the unique properties of the coaxial cavities, which may have a single non-degenerate mode, I demonstrate thresholdless lasing at cryogenic temperatures, thus providing a scalable solution to overcoming the metal losses.
Biosketch: Mercedeh Khajavikhan received B.S. and M.S. in Electronics from Amirkabir University of Technology, Tehran, Iran, in 2000 and 2003, respectively, and Ph.D. in Electrical Engineering from University of Minnesota in 2009. Her Ph.D. dissertation was on coherent beam combining for high power laser applications. In 2009, she joined University of California in San Diego as a postdoctoral researcher where she worked on the design and development of nanolasers, plasmonic devices, and silicon photonics components. She is currently working as staff researcher in advanced network sciences group in ECE department at UCSD, developing new techniques for low cost imaging systems.