The Center for Quantum Devices in the News by    
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81.  
Tunable Lasers to Revolutionize Infrared Spectroscopy
Tunable Lasers to Revolutionize Infrared Spectroscopy
McCormick Press Release - June 8, 2016
A new development from Northwestern Engineering’s Manijeh Razeghi could be another tool for protecting our borders. Supported by the Department of Homeland Security, Razeghi’s lab has created a new, revolutionary, broad-band tunable infrared laser that has major implications for the detection of drugs and explosives. The robust, all solid-state laser can be rapidly tuned to emit in the wavelength range that encompasses the critical “fingerprint” region where most molecular features are absorbed and identified through infrared sensing. In experiments, the laser has demonstrated its ability to capture the unique spectral fingerprint of gases. The initial, patent-pending results have been published in the June 8 issue of Nature Scientific Reports. The research and development of the laser system is the culmination of more than 18 years of quantum cascade laser development work at Northwestern’s Center for Quantum Devices. ... [read more]
 
82.  
It's time for terahertz
It's time for terahertz
Physics World - June 6, 2016
Razeghi has been a world leader in semiconductor devices for several decades. After seeing the first infrared QCL demonstrated at low temperature and power by Jerome Faist's group at Bell Labsin 1994, she decided to maximize the possibilities for terahertz research. "I immediately tried for a roomtemperature, continuous-wave terahertz quantum cascade laser," Razeghi recalls. In 2011 she achieved her dream. While terahertz QCLs have to work at cryogenic temperatures, midinfrared QCLs have no such limitations because their band gaps are wioe enough to function at room temperature. Razeghi and her colleagues therefore used a technique in which two mid-infrared QCL beams of marginal frequency difference are mixed together. When two photons - one from each beam - annihilate, they spontaneously produce a third photon with a frequency equal to the difference between the two lasers. If the two beams are designed to have a frequency difference between them equal to a terahertz frequency, then a terahertz photon is produced (Appl. Phy. Lett. 99 131106). ... [read more]
 
83.  
Wenjia Zhou Wins 1st Place at 2016 CNST Nanotechnology Poster Session
Wenjia Zhou Wins 1st Place at 2016 CNST Nanotechnology Poster Session
Press Release - May 6, 2016
Wenjia Zhou, a graduate student working with Professor Razeghi at the CQD, won first place in the 2016 CNST Nanaotechnology Poster Fair held at the University of Illinois at Urbana-Champaign on May 6 for his project “Monolithically integrated tunable quantum cascade laser source for gas sensing.” ... [read more]
 
84.  
Keynote Lecture Award: CNST 14th Annual Nanotechnology Workshop
Keynote Lecture Award: CNST 14th Annual Nanotechnology Workshop
Press Release - May 6, 2016
Professor Manijeh Razeghi was given the Keynote Lecture Award for her talk at the CNST 14th Annual Nanotechnology Workshop held at the University of Illinois at Champaign-Urbana on May 6, 2016. ... [read more]
 
85.  
Wenjia Zhou Wins 3rd Place at 2016 EECS Poster Session
Wenjia Zhou Wins 3rd Place at 2016 EECS Poster Session
EECS Press Release - April 19, 2016
Wenjia Zhou, a graduate student working with Professor Razeghi at the CQD, won third place in the 2016 EECS Poster Fair on April 19 for his project on “Monolithically integrated tunable quantum cascade laser source for gas sensing.” ... [read more]
 
86.  
Thomas Yang Wins 3rd Place at 2016 EECS Poster Session
Thomas Yang Wins 3rd Place at 2016 EECS Poster Session
EECS Press Release - April 19, 2016
Thomas Yang, an undergraduate student working with Professor Razeghi at the CQD, won third place in the 2016 EECS Poster Fair on April 19 for his project on “Material Growth and Characterization of III-V Materials for Long-Wavelength Infrared (LWIR) Detection using Quantum Disc-based Focal Plane Arrays.” ... [read more]
 
87.  
New Terahertz Source Could Strengthen Sensing Applications
New Terahertz Source Could Strengthen Sensing Applications
McCormick Press Release - March 25, 2016
Current terahertz sources are large, multi-component systems that sometimes require complex vacuum systems, external pump lasers, and even cryogenic cooling. The unwieldy devices are heavy, expensive, and hard to transport, operate, and maintain. Now Northwestern Engineering’s Manijeh Razeghi has developed a new type of security detection device that bypasses these issues. With the ability to detect explosives, chemical agents, and dangerous biological substances from safe distances, the device could make public spaces more secure than ever. ... [read more]
 
88.  
 Single-chip mid-IR quantum-cascade laser plus amplifier is widely tunable
Single-chip mid-IR quantum-cascade laser plus amplifier is widely tunable
Laser Focus World Press Release - January 7, 2016
Manijeh Razeghi and her colleagues at Northwestern University (Evanston, IL) have now integrated a mid-infrared (4.8 μm spectral region) electrically tuned quantum-cascade laser (QCL) with an on-chip amplifier, creating a compact package that can output more than 5 W in pulsed mode tunable over a 270 nm spectral range. A refined geometry emits 1.25 W continuous-wave (CW) with a 300 nm tuning range. Both emit a nearly diffraction-limited beam even at a high amplifier current. Adjustable wavelength output, modulators, and amplifiers are all inside a single package.With this architecture, the laser has demonstrated an order-of-magnitude more output power than its predecessors, and the tuning range has been enhanced by more than a factor of two. ... [read more]
 
89.  
Single-Chip Laser Delivers Powerful Result
Single-Chip Laser Delivers Powerful Result
McCormick Press Release - January 7, 2016
From their use in telecommunication to detecting hazardous chemicals, lasers play a major role in our everyday lives. They keep us connected, keep us safe, and allow us to explore the dark corners of the universe. Now a Northwestern Engineering team has made this ever-important tool even simpler and more versatile by integrating a mid-infrared tunable laser with an on-chip amplifier. This breakthrough allows adjustable wavelength output, modulators, and amplifiers to be held inside a single package.With this architecture, the laser has demonstrated an order-of-magnitude more output power than its predecessors, and the tuning range has been enhanced by more than a factor of two. ... [read more]
 
90.  
David Heydari Wins 1st Place at 2015 NDConnect Poster Session
David Heydari Wins 1st Place at 2015 NDConnect Poster Session
Notre Dame Press Release - October 23, 2015
David Heydari, a senior working with Professor Razeghi and majoring in electrical engineering at Northwestern, won first place and $3,000 in the NDConnect 2015 undergraduate research competition at Notre Dame on October 23 for his project on “High-power quantum cascade lasers with angled cavities.” ... [read more]
 

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