Observation Of Strong Magneto Plasmonic Nonlinearity In Bilayer Graphene Discs
JOURNAL OF PHYSICS-PHOTONICS(2021)
摘要
Graphene patterned into plasmonic structures like ribbons or discs strongly increases the linear and nonlinear optical interaction at resonance. The nonlinear optical response is governed by hot carriers, leading to a red-shift of the plasmon frequency. In magnetic fields, the plasmon hybridizes with the cyclotron resonance, resulting in a splitting of the plasmonic absorption into two branches. Here we present how this splitting can be exploited to tune the nonlinear optical response of graphene discs. In the absence of a magnetic field, a strong pump-induced increase in on-resonant transmission can be observed, but fields in the range of 3 T can change the characteristics completely, leading to an inverted nonlinearity. A two temperature model is provided that describes the observed behavior well.
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关键词
graphene plasmonics, THz pump-probe, magneto plasmons, tunable nonlinearity, THz nonlinearity
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