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Characteristic Impedance Model for Plasmonic Metal Slot Waveguides

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3 Author(s)
Ly-Gagnon, D. ; Ginzton Lab., Stanford Univ., Stanford, CA ; Kocabas, S.E. ; Miller, D.A.B.

We investigate the transmission properties of a subwavelength plasmonic slot waveguide. We show that the transmission can be accurately calculated using the characteristic impedance of the propagating mode. Using such a model, we show that it is possible to design devices without extensive 3-D finite-difference time-domain (FDTD) computer simulations. We illustrate the approach with calculations of an asymmetric Fabry-Perot germanium photodetector based on the slot waveguide geometry, showing predicted detector efficiencies as high as 69% despite metallic losses.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:14 ,  Issue: 6 )