Quantum well surface-plasmon oscillator

Palmer, A. Jay
March 1987
Applied Physics Letters;3/2/1987, Vol. 50 Issue 9, p537
Academic Journal
We identify a new type of electromagnetic oscillator which utilizes the negative differential conductivity of a quantum well tunnel junction to drive surface-plasmon oscillations on the outside boundaries of the junction. We calculate the complex propagation constant as a function of frequency for the antisymmetric gap-mode surface plasmon on a state of the art GaAs/AlGaAs double-barrier tunnel junction. The surface-plasmon gain coefficient is found to be positive for frequencies up to 5 GHz. Single-mode oscillation of the surface plasmon at frequencies near 5 GHz is predicted on a tunnel junction with a lateral dimension equal to about 150 μm.


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