AbstractIn this work, we report on observation of Dyakonov plasmons at an interface with a hyperbolic metamaterial in the mid-IR. The hyperbolic metamaterial is implemented as a CMOS-compatible high aspect ratio grating structure with aluminium-doped ZnO (AZO) ridges grown by atomic layer deposition in deep trench silicon matrix. The dispersion of Dyakonov plasmons is characterized by the attenuated total reflection method in the Otto configuration. We demonstrate that Dyakonov plasmons propagate in a broad range of directions (a few tens of degrees) in contrast to the classical Dyakonov surface waves (about one tenth of degree). The obtained results provide useful guidelines for practical implementations of structures supporting Dyakonov plasmons in the mid-IR.
Graphene/Al2O3 HMM stack, coupled to a gold grating structure, for tunable, label-free, and highly sensitive biosensing in the mid-IR wavelength region. FDTD simulations show that the proposed device can achieve a maximum sensitivity of 4052 nm RIU−1.
Experimental observation of Dyakonov plasmons in the mid-infrared
