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(Color online) (a) Two-dimensional THz mode profile for a wide ridge and a top contact metal strip of the same width (, ). (b) Buried waveguide with a top metal strip width of and electron channel width of (, ). Note that the THz mode does not reach the edges of the ridge.
Effect of metal strip width on the figure of merit (the ratio of the overlap of the optical mode with the active region to the optical losses) for buried waveguide and ridge structures. The overlap is calculated with an electron channel width equal to the width of the metal strip.
Pulsed electrical and optical characteristics of buried waveguide and ridge structures at . The peak power is displayed. The length of each device is and one facet is coated with a high reflectivity mirror.
Threshold current density as a function of heat-sink temperature in continuous wave and pulsed operation for long lasers for buried waveguide and ridge samples. The high reflectivity coated buried waveguide sample shows cw laser operation up to . The solid lines are guides for the eyes.
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