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Mikhail A. Belkin, Jonathan A. Fan, Sahand Hormoz, Federico Capasso, Suraj P. Khanna, Mohamed Lachab, A. G. Davies, and Edmund H. Linfield, "Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K," Opt. Express 16, 3242-3248 (2008)