We demonstrate continuous tuning of a terahertz quantum cascade wire laser over a broad range of ( of the center frequency) with single-mode operation. Tuning is achieved with a narrow laser ridge () and a moveable MEMS (microelectromechanical systems) side object (plunger) to manipulate the transverse optical mode. The frictionless MEMS plunger enables continuous and reversible tuning. We demonstrate redshift tuning using a silicon plunger and blueshift tuning using a metal plunger. The blueshift tuning range is limited by the bandwidth of the gain medium rather than the tuning mechanism.
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