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June 19, 2008

Mtg: Photonic Crystal Devices (LEOS Distinguished Lecture)

by @ 3:59 pm. Filed under ALL, BioEngineering, NanoEngineering, Optics/Displays

TUESDAY August 5, 2008
SCV Lasers and ElectroOptics Chapter
Speaker: Prof. John O’Brien, University of Southern California
Time: Networking and Pizza Social at 6:00 PM, Presentation at 7:00 PM
Cost: none
Place: National Semiconductor Building E Auditorium, 2900 Semiconductor Drive, Santa Clara
RSVP: please use the “RSVP” button on the web page to reserve

Two-dimensional photonic crystal devices take advantage of our ability to pattern the dielectric, through nanofabrication techniques, on a scale that is shorter than the optical wavelength at which the device operates. ? Patterning on this length scale allows us, in principle, to engineer the electromagnetic properties of photonic devices in microscopic detail. ? It is a serious challenge, however, to understand how to utilize this freedom to improve device performance, and this photonic crystal device technology is still relatively immature. ? Nevertheless, a great deal of progress in photonic crystal device development has been made in the past few years.

In this presentation Prof. O’Brien will discuss photonic crystal lasers with particular emphasis on devices capable of room temperature CW operation and devices with quantum dot active regions. ? CW lasers have -3dB modulation bandwidths over 10 GHz with approximately 30dB of side mode suppression. ? The photonic crystal lasers with quantum dot active regions have absorbed powers at threshold of under 15 microwatts. ? The presentation will also describe approaches to increasing the output power obtained from these lasers illustrated with data showing 100 microwatts of pulsed output power from a microcavity photonic crystal laser.

The presentation will also address device issues associated with passive photonic crystal components such as optical loss, waveguide dispersion, and the design of waveguide junctions. ? Demonstrations of Mach-Zehnder interferometers and directional couplers will be presented and again results from experiments will be compared to numerical predictions.

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