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Loss in the metal is the main factor restricting practicality of plasmonic and metamaterial devices. In this tutorial the inevitability of the loss, its physical origins and the means to mitigate it will be considered
We demonstrate the detection of subbandgap light in silicon nano pyramid using the process of internal photoemission in Schottky diode. The quantum efficiency is enhanced by using metal coated silicon nano pyramids.
We show that full compensation of loss in plasmonic waveguides with significantly sub-wavelength light confinement (less than λ/4n) requires current density in excess of 100 kA/cm2 making sub-wavelength in all three dimensions laser (spaser) impractical.
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