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Yu Yao, Electrical Engineering

Yu Yao

Yu’s research focuses on Quantum Cascade (QC) lasers, a type of semiconductor lasers based on intersubband transitions in coupled quantum well heterostructures. The laser emission wavelength can be flexibly tailored to cover the mid- to far-infrared wavelength region. She has enjoyed playing with hundreds of quantum wells to achieve novel QC laser designs with wide voltage tuning range, broad wavelength coverage as well as high power and efficiency.

Her research group are closely collaborated with many experts in spectroscopy, environmental sensing, medical diagnosis, etc. Their goal is to develop QC lasers that serve a wider range of applications.

Selected Publications

  • Y. Yao, W. O. Charles, K. J. Franz, A. Shen, M. C. Tamargo and C. F. Gmachl, “Intersubband electroluminescence from ZnCdSe/ZnCdMgSe Quantum Cascade laser structure”, in preparation.
  • Y. Yao, X. Wang and C. F. Gmachl, “High performance ‘continuum-to-continuum’ Quantum Cascade lasers with a broad gain bandwidth over 400 cm-1”, submitted to Applied Physics Letters.
  • Y. Yao, T. Tsai, W.O. Charles, J. Chen, G. Wysocki and C. F. Gmachl, “Broadband Quantum Cascade laser gain medium based on a "continuum-to-bound" active region design”, Applied Physics Letters, 96, 211106 , 2010.
  • W. O. Charles, Y. Yao, K. J. Franz, Q. Zhang, A. Shen, C. Gmachl and M. C. Tamargo, “Growth of Znx’Cd(1-x’)Se/ZnxCdyMg(1-x-y)Se -InP Quantum Cascade structures for emission in the 3 – 5 µm range”, J. Vac. Sci. Technol. B Vol. 28, Issue 3, pp. C3G24-C3G27, 2010.
  • Y. Yao, K. J. Franz, X. Wang, J. Fan, C. F. Gmachl, “A widely voltage-tunable Quantum Cascade laser based on “two-step” coupling,” Applied Physics Letters, 95, 021105, 2009. 
  • Y. Yao, Z. Liu, A. J. Hoffman, K. J. Franz, C. F. Gmachl,Voltage tunability of Quantum Cascade lasers,” IEEE J. Quantum Electron, Vol. 45, No. 6, pp. 730-736, June 2009.

Selected Presentations

  • Y. Yao, W.O. Charles, K. J. Franz, A. Shen  and C. F. Gmachl, “Improvement on the luminescence efficiency, electroluminescence linewidth and transport perperties of ZnCdSe/ZnCdMgSe Quantum Cascade structures”, Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS), San Jose, CA. May 2010.
  • Y. Yao, T. Tsai, W.O. Charles, J. Chen, G. Wysocki and C. F. Gmachl, “ Broadband gain from continuum-to-bound  Quantum Cascade lasers,”  Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS), San Jose, CA. May 2010.
  • Y Yao, K. J. Franz, X. Wang, J. Fan, C. F. Gmachl, “Widely voltage tunable quantum cascade lasers” Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS). Baltimore, MD. June 2009.
  • Y. Yao, K. J. Franz, Z. Liu, A. J. Hoffman, C. F. Gmachl, “Voltage tuning of gain spectra in Quantum Cascade lasers”, Photonics West, San Jose, CA, Jan. 2009.