Center for Quantum Devices

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71.	TERAHERTZ OPTICS Room-temperature comb - June 21, 2019 A frequency comb in the terahertz region and that operates at room temperature could prove useful for applications in spectroscopy. The device, designed and built by scientists from Northwestern University in the US, relies on difference-frequency generation from a mid-infrared (mid-IR) quantum cascade laser (QCL). ... [read more]
72.	VISIT OF PROFESSOR MANIJEH RAZEGHI TO UPEC - June 19, 2019 Manijeh Razeghi has been a pioneer in the development and implementation of the main modern epitaxy techniques. After leading, from 1986 to 1991, the Exploratory Materials Laboratory at Thomson CSF; she is the Director of the Center for Quantum Devices at Northwestern University in Chicago. ... [read more]
73.	ECE Student Profile: Robby Gray - April 26, 2019 When Robby Gray (’19) isn’t working with lasers, he might be found on campus arranging music for the X-Factors acapella group, supporting new students as a leader for Wildcat Welcome, or working with Global Engineering Brigades to build health infrastructure for communities in Central America and West Africa. ... [read more]
74.	p-Type thin film field effect transistors based on lithium-doped nickel oxide channels grown by pulsed laser deposition Proceedings Volume 10919, Oxide-based Materials and Devices X; 109191H (2019 - March 12, 2019 Abstract Staggered back-gated Field Effect Transistor (FET) structures were made by growing Li-doped NiO on Si3N4/SiO2/Si (111) using room temperature pulsed laser deposition. Optical studies showed over 80% transmission for the NiO:Li channel at wavelengths > 500nm. The MISFET revealed rectifying transfer characteristics, with a VON close to zero, a channel mobility of ~ 1 cm2/Vs, a gate leakage current (at +5V) of 0.8 mA and an ION/IOFF ratio (at a Vgs of -15V) of ~ 103. The transistors showed enhancement-mode output characteristics indicative of a p-type channel with sharp pinchoff, hard saturation, a comparatively high (milliampere range) Id and a relatively low on-resistance of ~11 kΩ. Hence the adoption of Li doping in NiO channels would appear to be a promising approach to obtain p-type TFTs with superior transparency, speed and energy efficiency. ... [read more]
75.	Breaking Spectral and Performance Barriers for Diode Lasers - Plenary Speaker, Manijeh Razeghi - IPC 2018 IEEE Tv - February 19, 2019 This is a recording of the live-streamed plenary talk from Dr. Manijeh Razeghi, Director of the Center for Quantum Devices at Northwestern University, from the 2018 IEEE Photonics Conference (IPC). Title: "Breaking Spectral and Performance Barriers for Diode Lasers with Material Innovation" Abstract: From humble beginnings, diode laser technology has evolved to become an invaluable tool for many aspects of our daily lives. Diode lasers exhibit a number of favorable properties which have led to their wide adoption, including compactness, robustness, and mass producibility. ... [read more]
76.	Seeking Illumination Northwestern Office For Research - February 15, 2019 Lifelong passion, discipline, and curiosity have fueled Manijeh Razeghi’s breakthrough discoveries in semiconductor science, using light to create world-changing technologies ... [read more]
77.	New Method Improves Infrared Imaging Performance Norwestern Engineering - February 6, 2019 A new method developed by Northwestern Engineering’s Manijeh Razeghi has greatly reduced a type of image distortion caused by the presence of spectral cross-talk between dual-band long-wavelength photodetectors. ... [read more]
78.	Life, the Universe, and Everything: A Chat with Pioneering Physicist Manijeh Razeghi SPIE Photonics West 2019 - November 15, 2018 The secret to science, according to SPIE Fellow Manijeh Razeghi, lies within the periodic table. "If you take the periodic table, it means you are starting with atoms," says the 2018 winner of the Benjamin Franklin Medal in Electrical.Engineering, and chair of the Quantum Sensing and Nano Electronics and Photonics conference at SPIE Photonics West 2019. ... [read more]
79.	Applied Physics Letters' Releases New Article Authored by Razeghi & CQD Team ELECTRICAL ENGINEERING & COMPUTER SCIENCE DEPARTMENT NEWS - June 13, 2018 Her groups efforts at the Center for Quantum Devices (http://cqd.eecs.northwestern.edu/) (CQD) demonstrated growth and characterization of long wavelength infrared type-II InAs/InAs1-xSbx superlattice photodiodes with a 50% cut-off wavelength at 8.0 Î¼m on a GaSb substrate grown by metalorganic chemical vapor deposition. At 77 K, the photodiodes exhibited a differential resistance at zero bias (R0A) of 8.0 Î© cm2 and a peak responsivity of 1.26 A/W corresponding to a quantum efficiency of 21%. A specific detectivity of 5.4 Ã— 1010 cm Hz1/2/W was achieved at 7.5 Î¼m. Her coauthors include: D. H. Wu (https://aip.scitation.org/author/Wu%2C+D+H) , A. Dehzangi ... [read more]
80.	Prof. Razeghi is highlighted in the Northwestern Undergraduate Research Journal Electrical Engineering and Computer Science - June 11, 2018 Manijeh Razeghi is showing me a box. It's a small box, fitting well Within the palm of her hand and no more than a few inches in height. The transparent housing shows off the circuitry inside, including a row of AAA batteries which powers it. She points to a small node on the to of the box. "That is a light," she told me. "When you are in the sun, on the beach, a part of the sun, that is UV, has very high energy and can create cancer." She moves her hand in front of the sensor and the light fades out. She moves her hand away and it lights up again. ... [read more]

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