The Center for Quantum Devices in the News by    
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31.  
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]
 
32.  
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]
 
33.  
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]
 
34.  
 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]
 
35.  
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]
 
36.  
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]
 
37.  
Razeghi Gives an Overview of the CQD's Research Activites
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]
 
38.  
Tilted Laser Cavities Make Brighter Beams
Tilted Laser Cavities Make Brighter Beams
McCormick Press Release - March 16, 2015
A simple tilt of geometry recently made quantum cascade lasers (QCLs) even brighter. Led by Manijeh Razeghi, the Walter P. Murphy Professor of Electrical Engineering and Computer Science, a team of researchers in the McCormick School of Engineering has designed a new laser technology with high power and high brightness. QCLs emit mid- to far-range infrared radiation that can be used for the detection of gases, chemicals, and pollutants in the atmosphere. Good beam quality is necessary for sending infrared light across great distances, but few structures have been able to achieve both high power and high brightness. Razeghi’s group in the Center for Quantum Devices was able to achieve this using a remarkably simple technique: tilting the laser cavity. ... [read more]
 
39.  
Building a More Versatile Frequency Comb
Building a More Versatile Frequency Comb
McCormick Press Release - February 16, 2015
Frequency combs are the rulers of light. By counting a wavelength’s many oscillations, they measure distance and time with extraordinary precision and speed. Since the discovery of optical frequency combs in the 1990s, many applications in metrology, spectroscopy, and frequency synthesis have emerged. Research led by Manijeh Razeghi at Northwestern University’s Center for Quantum Devices has overcome technical hurdles and demonstrated a room temperature, compact frequency comb based on a quantum cascade laser (QCL) with wide spectral coverage and high power. Unlike earlier frequency comb sources based on fundamentally mode-locked lasers or high-Q microresonators with intense optical pumping, Razeghi’s solution is based on QCLs and electrically pumped solid-state sources. ... [read more]
 
40.  
Abbas Haddadi Won the Best Paper Award for the Breakthroughs in Human-Centered Research
Abbas Haddadi Won the Best Paper Award for the Breakthroughs in Human-Centered Research
SPIE Photonics West 2015 Conference - February 11, 2015
Abbas Haddadi won the award for "Breakthrough in Human-Oriented Applications," at the SPIE WEST 2015 Conference, which was held February 7-12, 2015 at the Moscone Center in San Francisco, California. Abbas Haddadi received the honor for his paper, titled, "High-performance dual-band mid-/long-wavelength infrared InAs/InAsSb type-II superlattice-based photodetectors for medical thermography applications," SPIE Photonics West 2015 is the largest and most influential event for the laser and photonics community in North America: 20,000 attendees, two exhibitions, 1,250 exhibiting companies, a wide range of papers on biomedical optics, biophotonics, translational research, industrial lasers, optoelectronics, microfabrication, optical MEMS, and more. ... [read more]
 

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