Center for Quantum Devices

Page 6 of 14: Prev << 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >> Next (336 Items)

126.	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]
127.	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]
128.	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]
129.	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]
130.	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]
131.	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]
132.	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]
133.	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]
134.	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]
135.	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]
136.	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]
137.	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]
138.	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]
139.	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]
140.	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]
141.	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]
142.	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. Razeghiâ€™s group in the Center for Quantum Devices was able to achieve this using a remarkably simple technique: tilting the laser cavity. ... [read more]
143.	Building a More Versatile Frequency Comb McCormick Press Release - February 16, 2015 Frequency combs are the rulers of light. By counting a wavelengthâ€™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 Universityâ€™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, Razeghiâ€™s solution is based on QCLs and electrically pumped solid-state sources. ... [read more]
144.	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]
145.	Andy (Guanxi) Chen Won the Best Paper Award for the Breakthroughs in Human-Centered Research SPIE Photonics West 2015 Conference - February 11, 2015 Andy (Guanxi) Chen 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. Andy (Guanxi) Chen received the honor for his paper, titled, "Worldâ€™s first pMp superlattice photodetectors enables high operating temperature infrared imaging," 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]
146.	David Heydari Won the Best Paper Award for the Breakthroughs in Human-Centered Research SPIE Photonics West 2015 Conference - February 11, 2015 David Heydari 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. David Heydari received the honor for his paper, titled, "High-power quantum cascade lasers with angled cavities," 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]
147.	Neelanjan Bandyopadhyay Won the Best Paper Award for the Breakthroughs in Human-Centered Research SPIE Photonics West 2015 Conference - February 11, 2015 Neelanjan Bandyopadhyay 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. Neelanjan Bandyopadhyay received the honor for his paper, titled, "Broadband quantum cascade laser tunable from 6.1 to 10.2Âµm," 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]
148.	New Infrared Photodetectors Improve Medical Screening McCormick Press Release - January 29, 2015 Led by Professor Manijeh Razeghi, members of Northwestern Universityâ€™s Center for Quantum Devices have improved the stability and lowered the cost of mid- and long-wavelength infrared photodetectors and focal plane array cameras. They achieved this by, first, using a novel type-II superlattice material called gallium-free indium-arsenide/indium-arsenide-antimonide or mercury-cadmium-telluride material. This design can be tuned to absorb a wide range of infrared wavelengths and a number of distinct infrared bands at the same time. This work is described in a paper published in the January 8 issue of Applied Physics Letters, the research was partially funded by DARPA, the Army Research Laboratory, the Air Force Research Laboratory, and NASA. ... [read more]
149.	Infrared Imaging Technique Operates at High Temperatures McCormick Press Release - January 23, 2015 From aerial surveillance to cancer detection, mid-wavelength infrared (MWIR) radiation has a wide range of applications. And as the uses for high-sensitivity, high-resolution imaging continue to expand, MWIR sources are becoming more attractive. A team of researchers at Northwestern Universityâ€™s Center for Quantum Devices (CQD) has incorporated new materials to develop detectors that can work at room temperature. Razeghi and her group developed an indium arsenide/gallium antimonide (InAs/GaSb) type II superlattice that demonstrated high-resolution MWIR images while operating at high temperatures. The new technique was particularly successful at obtaining infrared images of the human body, which has potential for vascular imaging and disease detection. ... [read more]
150.	Terahertz radiation from mid-infrared quantum cascade lasers Semiconductor Today - December 11, 2014 Northwestern Universityâ€™s Center for Quantum Devices in USA has developed a monolithic room-temperature terahertz (THz) source based on quantum cascade lasers (QCLs) [Q. Y. Lu et al, Appl. Phys. Lett., vol105, p201102, 2014]. The resulting device is tunable over the range 2.6THz-4.2THz, i.e. 47% of the central frequency. The team claims that the device is the first room-temperature, multi-section, two-color SGDFB-DBR structure to realize a monolithic tunable THz source.The researchers believe: â€œHigher THz power and continuous-wave operation can be further obtained by using a device structure with a higher THz conversion efficiency and better thermal packaging.â€ (Link) ... [read more]

Page 6 of 14: Prev << 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >> Next (336 Items)