科研之友
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摘要
We describe photo-induced current experiments observed in nm-sized electro-migrated nano gaps, using surface plasmon polaritons (SPPs) as the source of the optical driving field. For gaps smaller than 5 nm, we observe a stable photo-induced current that is linear with the intensity of the SPP mode, whereas the photo-current in wider gaps shows a highly nonlinear dependence that is reminiscent of field emission. The results are explained by a modified Wentzel-Kramers-Brillouin tunneling model, which reproduces the observed transition from optical rectification to optically driven field emission in the nano junction.
- 出版日期2016-5
