Center for Quantum Devices

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111.	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]
112.	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 â€œMonolithically integrated tunable quantum cascade laser source for gas sensing.â€ ... [read more]
113.	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]
114.	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 â€œMonolithically integrated tunable quantum cascade laser source for gas sensing.â€ ... [read more]
115.	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 â€œMaterial Growth and Characterization of III-V Materials for Long-Wavelength Infrared (LWIR) Detection using Quantum Disc-based Focal Plane Arrays.â€ ... [read more]
116.	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 Engineeringâ€™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]
117.	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 (4.8â€‰Î¼m spectral region) electrically tuned quantum-cascade laser (QCL) with an on-chip amplifier, creating a compact package that can output more than 5â€‰W in pulsed mode tunable over a 270â€‰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]
118.	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]
119.	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 â€œHigh-power quantum cascade lasers with angled cavities.â€ ... [read more]
120.	Razeghi Gives an Overview of the CQD's Research Activites University of Illinois-Urbana Champaigine & NSF Nano-Hub - April 2, 2015 Link to video Pretention ... [read more]

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