Home > Seminars > Monolithic Integration of Detectors, Rectangular Waveguides And Terahertz Quantum Cascade Lasers

Monolithic Integration of Detectors, Rectangular Waveguides And Terahertz Quantum Cascade Lasers


4/11/2014 at 12:30PM


4/11/2014 at 1:30PM


356 Fitzpatrick Hall


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Anthony Hoffman

Anthony Hoffman

VIEW FULL PROFILE Email: ajhoffman@nd.edu
Phone: 574-631-4103
Website: https://www.ee.nd.edu/research-lab-websites/hoffmanlab
Office: 266 Fitzpatrick Hall


College of Engineering Associate Professor
Mid-infrared & THz Photonics Group Principal Investigator
Research Interests:  Prof. Hoffman's mid-infrared and THz optoelectronics research is focused on understanding quantum phenomena for the development of new optical materials, sources, and detectors.  Much of his work focuses on quantum engineering, where hundreds of layers of extremely thin ...
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Terahertz technologies are still immature compared to microwave or infrared/visible technologies, even though there are many creative paths being explored for creating, manipulating, and detecting THz radiation. The quantum cascade laser (QCL) is currently the only solid-state source of coherent THz radiation capable of delivering more than 1 mW of average power at frequencies above ~ 2 THz and peak powers exceeding 1 W. This power level combined with the ability to create the lasers over a wide frequency range make QCLs an extremely appealing solid-state solution as compact sources for THz, especially for use as compact local oscillators (LOs) in heterodyne spectroscopy and sensing applications. Similar to solid-state microwave and infrared laser technology, the microelectronic nature of the THz QCLs allows them to be monolithically integrated with additional components and detectors to provide enhanced functionality. In this talk I will describe our work integrating THz QCLs with both on-chip rectangular waveguides for guiding and controlling the properties of the radiation emitted by the QCLs, and on-chip Schottky diodes to create a heterodyne receiver. This work was supported by the Sandia laboratory directed research and development (LDRD) program. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.

Seminar Speaker:

Mr. Michael Wanke

Mr. Michael Wanke

Sandia National Laboratories-Albuquerque, NM

Michael C. Wanke received the B.A. degree (cum laude) in physics and mathematics from Pomona College, Claremont, CA (1992), and the Ph.D. degree in physics from the University of California, Santa Barbara (1998), where he studied the electron dynamics in periodic structures at THz frequencies. In 1998, he joined Bell Laboratories, Lucent Technologies, Murray Hill, NJ, as a Postdoctoral Member of the Technical Staff. There he designed and tested mid-infrared (MIR) and terahertz (THz) quantum cascade lasers. In 2001, he joined Sandia National Laboratories, Albuquerque, NM, as a Senior Member of the Technical Staff in the Photonics Microsystems Technologies Department, and was promoted to Principal Member of Technical Staff in 2004. In 2010 he moved into the Laser, Optics and Remote Sensing Department at Sandia, where he led a team developing a near-infrared solid state laser. After serving as acting manager of the department for the last 6 months of 2012 he became a Distinguished Member of Technical Staff in 2013. His current focus is on optical and electrical measurements to explore the feasibility of using phosphorous donors in silicon for qubits, although he has continuing interests in THz and MIR devices including quantum cascade lasers, THz on-chip waveguides, THz integrated circuits, and heterodyne receivers.