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December 7, 2007

Mtg: Nanowires and Nanolasers: How Small can a Laser be?

by @ 6:36 pm. Filed under ALL, Communications, Electronics Design, Engineering Mgmt, Optics/Displays, Semiconductors
 

THURSDAY December 13
SCV Lasers and Electro Optics Chapter
Speaker: Prof. Cun-Zheng Ning, Arizona State University, and LEOS Distinguished Lecturer
Time: Networking and Food: 7:00 PM, Presentation: 8:00 PM
Cost: none
Place: National Semiconductor Building E Conference Center, 2900 Semiconductor Drive, Santa Clara
RSVP: by email to ieeescvleos-rsvp2007@yahoo.com
Web:
www.ewh.ieee.org/r6/scv/leos

 

The pursuit of nanotechnology in general and miniaturization of electronic devices in particular have seriously challenged the optoelectronics community to develop ever smaller lasers and optoelectronic devices compatible with the trend in microelectronics. Vertical-cavity surface emitting lasers measured a few microns were once the smallest lasers. ? The situation is now rapidly changing over the last 5 years with the demonstration of lasing capability of a single semiconductor nanowire of ~ 100 nanometers in diameter. ? The ultimate challenge to the community is: can one make a laser that is smaller than the wavelength in all 3 dimensions, or what is the ultimate size limit of a laser?

To answer this and related questions, my lecture will start with an overview of impressive recent progress in growth, fabrication, and characterization of semiconductor nanowires and demonstration of lasing activities in various wavelengths. ? These lasers represent one of the smallest lasers of any kind at present. ? We will show how this new type of miniaturized laser differs from conventional semiconductor lasers. ? To further reduce the dimension of nanowire lasers, a recent proposal to use metal coating of semiconductor wires will be evaluated by numerical simulation. ? We will show that a proper design of a metal coated semiconductor nanowire can achieve lasing threshold despite significant metal loss. ? Finally some recent novel ideas involving surface plasmonic excitations at metal-semiconductor interface will be discussed where much smaller lasers could be potentially made, with size independent of wavelengths of light emitted.

 

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