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Boston University

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To help develop a handheld electron beam-pumped semiconductor laser that would be the first to operate in the ultraviolet, Boston University professor Theodore Moustakas has received a $1.5 million, two-year subcontract from DARPA. Because of the laser’s ultralow emission wavelength and compact size, it could be exploited for a wide range of applications, including identification of biological and chemical substances used in potential terror attacks, and in point-of-care chemical analysis of blood and other bodily fluids. To develop the technology, Moustakas, a member of the university’s electrical and computer engineering department, and his co-investigators will fabricate UV laser materials and component devices. They plan to make a laser structure that, when bombarded with an electron beam, produces pairs of electrons and holes (positively charged particles) that recombine and produce the UV light.
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Published: April 2011
Glossary
quantum dots
A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
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