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21.  
Widely tunable MIR QCL eyed for spectroscopy, chemical sensing
Widely tunable MIR QCL eyed for spectroscopy, chemical sensing
flhotonlcs Spectra 29 - August 15, 2016
A broadband-tunable IR laser has dem­onstrated the ability to capture the unique spectral fingerprints of gases. The monolithic laser technology is compact, and is expected to have applications in spectroscopy and chemical sensing. The laser only has one moving part-a fan for cooling purposes -which Northwestern University professor Manijeh Razeghi cited as a major advantage over existing systems. Most such lasers require mechanical parts to achieve tuning. It oper­ates in the 6.2-to 9.1-µm wavelength range with a single emit­ting aperture by integrating an 8-laser sampled grating distrib­uted feedback laser array with an on-chip beam combiner, and its gain medium is based on a 5-core heterogeneous quantum cascade laser wafer. ... [read more]
 
22.  
Improving Internet with Mid-Wavelength Infrared
Improving Internet with Mid-Wavelength Infrared
McCormick Press Release - July 26, 2016
Razeghi and her team have developed an extremely sensitive mid-wavelength infrared photodetector that has potential to replace near-infrared FSO communications links in many applications. Called a phototransistor, the novel device is a combination of an electronic transistor and optoelectronic photodiode. ... [read more]
 
23.  
Top Downloaded Book
Top Downloaded Book
Springer Science - July 11, 2016
Professor Manijeh Razeghi's book "Fundamentals of Solid State Engineering" was named one of Springer's top 25% Most downloaded books in 2015. You can download your own copy of this book at the following link: http://www.springer.com/gp/book/9780387921679#otherversion=9780387921686 ... [read more]
 
24.  
Security detection device features stable THz source
Security detection device features stable THz source
Photonics Spectra - July 1, 2016
Razeghi and her team based their system on nonlinear mixing in quantum cascade lasers. The system achieved room temperature CW emission at 3.41 THz with a side-mode suppression ratio of 30 dB and output power up to 14 μW, with a wall-plug efficiency about one order of magnitude higher than previous demonstrations. ... [read more]
 
25.  
Top Downloaded Book
Top Downloaded Book
Springer Science - June 14, 2016
Professor Manijeh Razeghi's book "Technologies of Quantum Devices" was named one of Springer's top 50% Most downloaded books in 2015. You can download your own copy of this book at the following link: http://www.springer.com/us/book/9781441910554#otherversion=9781441910561 ... [read more]
 
26.  
2016 EECS Annual Awards Winners: Abbas Haddai Best PhD Dissertation
2016 EECS Annual Awards Winners: Abbas Haddai Best PhD Dissertation
EECS Department News - June 9, 2016
The accomplishments in the department of Electrical Engineering and Computer Science were celebrated at the 2016 EECS Annual Awards Ceremony on Tuesday, June 7 in Tech L440. The Best Dissertation award was givento Abbas Haddadi (Advisor: Prof. Manijeh Razeghi), for his dissertation entitled "Type-II Antimonide-based Superlattices for High Performance Infrared Detectors and Imagers" ... [read more]
 
27.  
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]
 
28.  
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]
 
29.  
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]
 
30.  
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]
 

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