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The far-infra-red (FIR) emission from the grating-coupled two-dimensional (2-D) plasmon in an AlGaAs/GaAs heterointerface was investigated and a quite high emission power of 30 ?W/cm2 (460 ?m wavelength) was obtained under an applied electric field of 760 V/cm. This output power is three orders of magnitude higher than that reported previously. Our calculations suggest that an applied field of 2?3...
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