Abstract
A tunable infrared photodetector based on graphene surface plasmon polaritons (SPP) controlled by the ferroelectric domains was demonstrated in this work. We designed the ferroelectric layer to build periodically ferroelectric domains, producing a non-volatile electric field for the convenience of tuning graphene SPP to resonate with the incident wavelengths. This novel strategy facilitates the improvement of absorption of incident photons without additional biasing or patterning graphene, compared with the reported graphene plasmonic photodetectors. In our proposed photodetector, the graphene carriers could be readily tuned by varying ferroelectric microstructure, yielding a tunable absorption peak in the range from 6 μm to 20 μm and significantly enhanced photo-responsivity.
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