126.
| Honoring Manijeh Razeghi, Northwestern University
Optical Society of America (OSA) - February 15, 2017
Dr Razeghi is a uniquely inspiring person, with an incredible drive and passion. She knows no obstacles for achieving technological wonders in her laboratory. Her courage, strong will and relentless academic activity are an impressive example for anyone who has a privilege of working under her instruction. I'd like to express to her my deep gratitude for helping me grow as a human being and as a scientist. ... [read more]
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127.
| Certification of Appreciation from Journal of Nanophotonics
SPIE - January 26, 2017
Dr. Manijeh Razeghi received a Certificate of Appreciation from the Journal of Nanophotonics for her service as a reviewer for the journal for 2016. ... [read more]
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128.
| Quantum cascade lasers: from tool to product
Opt. Express 23(7), 8462-8475 (2015) - December 21, 2016
OSA's Optics Express publishes some of the most-cited research in optics and photonics. In fact, with 84,397 Total Citations in 2015, it is ranked the 2nd most cited Journal out of 90 journals in the Optics Category, according to the 2015 Journal Citation Reports® (Thomson Reuters, 2016). It is also ranked #2 in the Google Scholar Optics & Photonics Category (h5-index 105). ... [read more]
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129.
| Razeghi Featured in McCormick Fall Newsletter
McCormick Research Newsletter, Fall 2016 - October 15, 2016
Center for Quantum Devices Director Manijeh Razeghi was featured in the Fall Newsletter of the McCormick School of Engineering and Applied Science. This fall she won the Czochralski Gold Medal in recognition of her life's work in the area of material science. ... [read more]
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130.
| Dr Abbas Haddadi Receives 2016 International Institute for Nanotechnology (IIN) Outstanding Researcher Award
2016 IIN Symposium - October 6, 2016
Dr Abbas Haddadi has received 2016 International Institute for Nanotechnology (IIN) Outstanding Researcher Award. The award is given to the researchers who have made exceptional contributions to the nanotechnology research effort over the past year. ... [read more]
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131.
| Manijeh Razeghi Receives Jan Czochralski Gold Medal
McCormick Engineering News/ Amanda Morris - September 12, 2016
Northwestern Engineering’s Manijeh Razeghi has received the Jan Czochralski Gold Medal from the European Materials Research Society. The award recognizes her life achievements in the field of advanced materials science.
An expert in quantum devices, Razeghi will be presented with the award and will deliver a plenary talk at the Society’s fall meeting on Wednesday, September 21 in Warsaw, Poland.
“It took decades for the scientific community to recognize the importance of Jan Czochralski’s work,” said Razeghi, Walter P. Murphy Professor of Electrical Engineering and Computer Science in Northwestern’s McCormick School of Engineering. “On the 100th anniversary of his discovery, I am particularly proud to receive this award for my contributions to semiconductor quantum materials and devices. We can see the results of Czochralski’s science in almost every electronic and photonic device that we encounter. Even the first light-emitting diode would not have been successful without the high-quality substrates produced with the Czochralski Method.”
... [read more]
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132.
| 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]
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133.
| 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]
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134.
| 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]
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135.
| 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]
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136.
| 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]
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137.
| 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]
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138.
| 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]
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139.
| 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]
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140.
| 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]
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141.
| 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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142.
| 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]
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143.
| 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]
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144.
| 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]
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145.
| 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]
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146.
| 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]
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147.
| 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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148.
| 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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149.
| 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]
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150.
| 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]
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Address: Center for Quantum Devices; 2220 Campus Drive RM 4051; Evanston, IL 60208-0893
Phone: (847) 491-7251
Email: razeghi@northwestern.edu