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BEGIN:VEVENT
DTSTAMP:20260828T200420Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110401T160000Z
DTEND:20110401T170000Z
UID:event761@bu.edu
URL:http://physics.bu.edu/internal/events/show/761
SUMMARY:Band structure engineering for novel infrared semiconductor lasers
DESCRIPTION:Featuring Oana Malis\, Purdue University\nHosted by: Karl Ludwi
	g\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nAbstract\nQ
	uantum confinement in the conduction band of semiconductor heterostructures
	 leads to interesting optical material properties in the infrared range of 
	the electromagnetic spectrum. Research on intersubband transitions in recen
	t years has resulted in numerous fundamental discoveries and technological 
	applications. The quantum cascade laser (QCL) is possibly the most successf
	ul device application of intersubband transitions. As a compact\, high-powe
	r light source\, the QCL is ideally suited for practical applications such 
	as trace-gas sensing for environmental and defense applications\, and free-
	space telecommunications. I will describe our ongoing efforts to advance th
	e understanding of intersubband transitions and charge transport as they re
	late to QCL operation. Our approach is interdisciplinary in nature involvin
	g elaborate band-structure modeling\, material growth\, and characterizatio
	n\, as well as device design and testing. In particular I will focus on cur
	rent research to explore new materials and light generation mechanisms. To 
	achieve surface emission from QCLs\, we are studying intra-valence band tra
	nsitions in GaAs/AlAs heterostructures. Finally\, I will discuss the fascin
	ating opportunities promised by nano-structured nitride materials for near-
	 and far-infrared light emission.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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