Search Results - "Escarra, M.D."

Rapid and Minimally Invasive Quantum Cascade Wafer Testing by Bentil, E.N., Toor, F., Hoffman, A.J., Escarra, M.D., Gmachl, C.F.

“…In this work, we demonstrate a rapid and minimally invasive technique for wafer quality testing, which requires using a single etch and metallization step to…”
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Short Injector Quantum Cascade Lasers by Franz, K.J., Liu, P.Q., Raftery, J., Escarra, M.D., Hoffman, A.J., Howard, S.S., Yu Yao, Dikmelik, Y., Xiaojun Wang, Jen-Yu Fan, Khurgin, J.B., Gmachl, C.

“…We report our study on the effects of shortened quantum cascade (QC) laser injector regions. While conventional short-wavelength QC lasers typically have…”
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Role of interface roughness in the transport and lasing characteristics of quantum-cascade lasers by Khurgin, J.B., Dikmelik, Y., Liu, P.Q., Hoffman, A.J., Escarra, M.D., Franz, K.J., Gmachl, C.F.

“…A density-matrix based theory of transport and lasing in quantum-cascade lasers reveals that large disparity between lasing linewidth and tunneling broadening…”
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Instantaneous power and threshold in continuous wave quantum cascade lasers by Hoffman, A.J., Braun, P.X., Escarra, M.D., Howard, S.S., Franz, K.J., Xiaojun Wang, Jen-Yu Fan, Gmachl, C.

“…Using low-duty cycle pulses superimposed on a DC current, we determine the type of power roll-over and obtain the instantaneous threshold current, current…”
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Ultra-low voltage defect quantum cascade lasers by Escarra, M.D., Hoffman, A.J., Franz, K.J., Howard, S.S., Xiaojun Wang, Jen-Yu Fan, Gmachl, C.

“…We demonstrate a quantum cascade laser featuring a low-voltage-defect short injector. Devices showing a voltage-defect as low as 20 meV and voltage efficiency…”
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Intersubband absorption loss in high-performance mid-infrared quantum cascade lasers by Dikmelik, Y., Khurgin, J.B., Escarra, M.D., Liu, P.Q., Hoffman, A.J., Franz, K.J., Gmachl, C.F., Fan, J., Xiaojun Wang

“…We calculate intersubband absorption loss and report measured waveguide loss for two high-performance mid-infrared quantum cascade laser designs. Intersubband…”
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Quantum Cascade Lasers with ultra-strong coupling injection by Liu, P.Q., Hoffman, A.J., Escarra, M.D., Franz, K.J., Khurgin, J.B., Dikmelik, Y., Xiaojun Wang, Jen-Yu Fan, Gmachl, C.F.

“…We demonstrate a Quantum Cascade Laser employing ultra-strong (~20 meV) coupling between the injector and the upper laser state. The laser shows a pulsed…”
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Negative differential resistance and pulse instabilities in minimalized quantum cascade laser structures by Franz, K.J., Raftery, J.J.J., Liu, P.Q., Hoffman, A.J., Escarra, M.D., Howard, S.S., Dikmelik, Y., Khurgin, J.B., Xiaojun Wang, Jen-Yu Fan, Gmachl, C.

“…We study high performing mid-infrared quantum cascade lasers with highly discretized injector regions. We observe negative differential resistance features of…”
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Mode matching of terahertz radiation to cylindrical wire waveguides by Deibel, J.A., Kanglin Wang, Escarra, M.D., Mittleman, D.M.

“…We describe a method for dramatically enhancing the coupling of THz radiation to a wire waveguide using a radially symmetric photoconductive antenna. We…”
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Photoconductive terahertz antenna with radial symmetry by Deibel, J.A., Escarra, M.D., Mittleman, D.M.

“…The use of coaxial waveguides with terahertz pulses requires the difficult excitation of the radially polarized fundamental mode of the waveguide. We propose a…”
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Mode matching of terahertz radiation to cylindrical wire waveguides using radially symmetric photoconductive antennas by Deibel, J.A., Kanglin Wang, Escarra, M.D., Mittleman, D.M.

“…Wire waveguides have recently been shown to be valuable for transporting pulsed terahertz radiation. A radially polarized surface wave is excited when a…”
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