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Li, Xiaofeng

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Li

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Xiaofeng

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Li, Xiaofeng

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2009 - 20102

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Author's Publications: search.filters.isAuthorOfPublication.8f58e607-4e2b-453b-b294-2800545cd8c9

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Now showing 1 - 2 of 2
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    Stretchable Microfluidic Radiofrequency Antennas
    (Wiley-Blackwell, 2010) Kubo, Masahiro; Li, Xiaofeng; Kim, Choongik; Hashimoto, Michinao; Wiley, Benjamin J.; Ham, Donhee; Whitesides, George
    Highly stretchable and robust antennas are fabricated by injecting liquid metal into a microfluidic channel that consists of two types of silicone rubber with different stiffness. The resulting antennas exhibit high mechanical stability under strain, while retaining high stretchability; these antennas can be stretched by up to a tensile strain of 120% with little degradation in radiation efficiency.
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    Mode-Locked Pulses from Mid-Infrared Quantum Cascade Lasers
    (Optical Society of America, 2009-12-01) Wang, Christine Y.; Kuznetsova, Lyuba; Gkotsas, Vasileios‐Marios; Diehl, L; Kaertner, Franz X.; Belkin, Mikhail A.; Belyanin, Alexey; Li, Xiaofeng; Ham, Donhee; Schneider, Harald; Grant, Peter; Song, C. Y.; Haffouz, Soufien; Wasilewski, Zbigniew; Liu, H. C.; Capasso, Federico
    In this study, we report the unequivocal demonstration of midinfrared mode-locked pulses from quantum cascade lasers. The train of short pulses was generated by actively modulating the current and hence the gain of an edge-emitting quantum cascade laser (QCL). Pulses with duration of about 3 ps at full-width-at-half-maxima and energy of 0.5 pJ were characterized using a second-order interferometric autocorrelation technique based on a nonlinear quantum well infrared photodetector. The mode-locking dynamics in the QCLs was modeled based on the Maxwell-Bloch equations in an open two-level system. Our model reproduces the overall shape of the measured autocorrelation traces and predicts that the short pulses are accompanied by substantial wings as a result of strong spatial hole burning. The range of parameters where short mode-locked pulses can be formed is found.