• May 2017. Four group members will give talks and posters at CLEO 2017 in San Jose.
  • 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 invited talk at Photonics West 2017, and invited tutorial at OTST 2017.
  • 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,, 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.

The Terahertz Devices and Intersubband Nanostructures Laboratory is broadly focused on the study of device physics and development of novel devices at the intersection of the following concepts:

  • Engineering of quantum electronic properties in low-dimensional semiconductors
  • Engineering of artificial electromagnetic materials and structures
  • Development of novel technologies for the generation, detection, and control of THz and mid-IR radiation

The terahertz frequency range lies roughly between 300 GHz and 10 THz (between the microwave and infrared spectra), and has seen comparatively little technological development in large part because of the great difficulty in generating and detecting THz radiation. THz radiation is of interest for chemical and biological sensing, security screening and explosive and drug detection, astrophysical probes of the early universe and star/galaxy formation, medical imaging, nondestructive evaluation of materials, industrial inspection, and short-range high-bandwidth communications.

This convergence of interests is epitomized by the quantum cascade laser, an intra-band semiconductor laser for which the wavelength of light is not determined not by the bandgap, but rather is chosen by engineering electronic states in coupled 2D quantum wells - i.e. by creating "artificial  molecules."

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