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We demonstrate terahertz microcavity lasers at lambda=112 mum with ultra-low current thresholds of 4 mA and with mode volumes of less than one-cubic-wavelength. Confinement in the longitudinal direction is obtained using almost-circular micro-disk resonators. The guiding properties of surface-plasmons are exploited to guide the mode with the metal contact. The devices laser up to 70 K in pulsed mode,...
We report the pulsed, room-temperature operation of a surface-plasmon quantum cascade laser at an operating wavelength of ap 7.5 mum. Improved performance of the surface-plasmon waveguide has been obtained by using silver as a plasmon-carrying layer.
Surface-plasmon waveguides based on metallic strips can provide a two-dimensional optical confinement. This concept has been successfully applied to midinfrared quantum cascade lasers, processed as ridge waveguides, to demonstrate that the lateral extension of the optical mode can be influenced solely by the width of the device top contact. In this configuration, the waveguide mode has a reduced interaction...
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