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  • Sept 2019. Our paper on broadband tuning (>20%) of THz QC-lasers in a VECSEL cavity is published in Nature Photonics. Link.
  • Sept 2019. Congratulations to Chris Curwen for receiving his Ph.D., and to Yue Shen for receiving his M.S.!
  • Sept 2019. The ITQW 2019 conference was held in Ojai, California from Sept. 15-20. ITQW2019
  • 2019. Invited talks by Prof. Williams are given at Photonics West, CLEO, IEEE RAPID, and IEEE IPC.
  • July 2018. We report a THz QC-VECSEL with over 1 Watt of output power in a high quality beam with 60 GHz of single-mode tuning. Link.
  • Dec 2017. Our VECSEL makes the cover of IEEE Journal of Selected Topics in Quantum Electronics.
  • Sept. 2017. Our paper ”High performance terahertz metasurface quantum-cascade VECSEL with an intra-cryostat cavity” is chosen as “Editor’s Pick” in Applied Physics Letters. Link.
  • June 2017. Congratulation to Luyao Xu for receiving her Ph.D., Jiawei Wang and Yujie Lin for receiving their M.S. and to Daguan Chen for receiving his B.S.!
  • May 2017. Luyao Xu has been awarded the UCLA EE Department “Distinguished PhD Dissertation Award in Physical & Wave Electronics” for 2016-17. Congratulations!
  • April 2017. We report metasurface lasers with electrically switchable polarization in Optica. Press release.
  • April 2017. Congratulations to incoming graduate student Parastou Mortazavian on receiving the NSF Graduate Research Fellowship! Link.
  • October 2016. We report high brightness and efficiency THz QC VECSELs with focusing and amplifying metasurfaces. Link.
  • October 2016. Our group is featured in UCLA Engineer Magazine. Link
  • Prof. Williams will give an invited talk at Photonics West 2017, and invited tutorial at OTST 2017. A video of the Photonics West talk is available here.
  • Sept 2016. Congratulations to Dr. Benjamin Burnett for successful completion of his Ph.D. !
  • June 2016. Congratulations to Luyao Xu for being awarded the UCLA Dissertation Year Fellowship for 16/17!
  • Feb 2016. Prof. Williams is awarded a Presidential Early Career Award for Scientists and Engineers (PECASE). Link Link
  • Feb 2016.Congratulations to Luyao Xu for winning the Best Student Presentation Award in the VECSEL Conference at SPIE Photonics West 2016! Link
  • Jan 2016. Press coverage on metasurface VECSEL in Physics Today, Laser Focus World, Photonics.com, Semiconductor Today,
  • September 2015. We report at ITQW 2015 the first demonstration of an external cavity laser based upon an amplifying reflectarray metasurface - a THz VECSEL. It is published in  Applied Physics Letters.
  • 2015. Congratulations to Luyao Xu for winning a 2015 SPIE Optics and Photonics Scholarship!
  • May 2013. Congratulations to Amir Ali Tavallaee, for winning the EE department’s “Distinguished PhD Dissertation Award in Physical & Wave Electronics” for 2012-13!
  • March 2013. Our paper on “Radiation Model for THz  Transmission-Line Metamaterial QC-Lasers” wins 2013 IEEE Trans. THz Science and Technology Best Paper Award.
  • January 2013. We report the first THz active composite right/left handed (CRLH) metamaterial waveguides in Applied Physics Letters.
  • January 2012. Prof. Williams wins NSF CAREER award.
  • April 2011. Our upcoming talk on active THz metamaterial waveguides at SPIE Defense, Security, and Sensing (DSS) Conference is featured in the SPIE Newsroom (April 11 2011).
  • July 2010. Our proposal for THz metamaterial lasers has been covered in Nature Photonics "Research Highlights”.
  • March 2008. Prof. Williams wins DARPA Young Faculty Award.
  • September 2007. Nature Photonics publishes a review paper on THz quantum-cascade lasers.

Graduate Students

    There will be ongoing openings for motivated and enthusiastic graduate students in various areas related to quantum cascade lasers, terahertz devices, and low-dimensional semiconductor devices. Please see the EE Department for admission information. Please make sure to indicate your interest in Prof. Williams’s research on your application. If you are already a student at UCLA, please contact Prof. Williams with a copy of your CV, grades, and research interests.

Undergraduate Students

    Undergraduate research is a great way to gain practical hands-on experience with cutting-edge research, and see if graduate school is of interest to you. If you are an undergraduate student at UCLA who is interested in a research opportunity please contact Prof. Williams by email with a copy of your CV and grades.


    There are no current openings for postdocs.

Thinking about grad school in engineering? Or maybe you’re already a grad student? Here is a great advice article written by Prof. Rob Candler when he was a student about what it is like to be a grad student, and the processing of getting there. “Stuff most students never ask about grad school”

UCLA offers many opportunities for collaborative research, both inside the EE department, and across disciplines. The department offers world-class fabrication facilities in the UCLA Nanolab and UCLA is home to the interdisciplinary California NanoSystems Institute a newly opened center focusing on the convergence of nanotechnology (-fluidics, -photonics, -mechanics, -electronics), biotechnology, and medicine. Furthermore, southern California is home to many universities and a large technology industry.

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