Noise and terahertz rectification linked by geometry in planar asymmetric nanodiodes

Iñiguez-de-la-Torre, I.; Mateos, J.; Pardo, D.; Song, A. M.; González, T.
March 2009
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
Academic Journal
In this work, by means of Monte Carlo simulations, we evidence the presence of a terahertz resonant peak in the ac to dc rectification of planar asymmetric nanodiodes which, remarkably, is linked to a noise mechanism, collective charge fluctuations in the space-charge region around the active channel of the device. The current noise spectral density of the diodes is compared with the frequency-dependent ac to dc rectification with the aim of identifying the signature of the phenomenon in both quantities. The frequency and magnitude of the resonance can be tuned by modifying the diode geometry. Results are interpreted in terms of an equivalent circuit model.


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