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SUMMARY:CANCELLED! Organic Semiconductor Laser Sensors - Graham Turnbull\,
  St Andrews University\, UK
DTSTART:20110531T133000Z
DTEND:20110531T143000Z
UID:TALK31401@talks.cam.ac.uk
CONTACT:Jenny Clark
DESCRIPTION:The efficient light emission and simple processing of organic 
 semiconductors make them attractive candidates for miniature visible laser
 s. In this talk I will discuss recent progress in developing very compact 
 optically pumped lasers\, notably including the use of GaN light-emitting 
 diodes as an indirect electrical drive for organic lasers. I will also des
 cribe how organic semiconductors can function as very sensitive detectors 
 of nitroaromatic explosives vapours using a reversible quenching of the li
 ght emission. When configured as thin-film distributed feedback lasers\, t
 he presence of explosive vapours can be used to switch operation across la
 ser threshold\, giving a rapid response to ppb concentrations of TNT-like 
 molecules.
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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