Abstract
The utilization of surface plasmons (SPs) in the form of hot electrons has a great potential for applications in photodetection. Unfortunately, the metallic nanostructures usually support only narrowband plasmon resonances and the hot-electron thermalization loss results in an inefficient internal quantum process. Here, we demonstrate a broadband super absorber based on the metallic nanorod arrays (NRs). The average absorption across the entire visible band is up to 0.8 and the conversion efficiency is over 30-fold enhanced relative to the reference. Furthermore, considering the metallic nanostructures are usually complex with a high fabrication challenge, we present a purely planar hot-electron photodetector based on Tamm plasmons (TPs). More than 87% of the light incidence can be absorbed by the top metal layer. This enables a strong and unidirectional photocurrent and a photoresponsivity that can even be higher than that of the conventional nanostructured system.
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