1.Investigation of nonreciprocal structures that suppport one-way propagation based on the presence asymmetric structures consisting of diffracted surface and regular finite periodic structure. The mechanism of unidirectional propagation is closely relevant to the energy conversion among different diffraction modes. Such configuration offers a viable alternative to existing concepts of photonic analogues of one-way electronic devices.2. Investigation of optical analogues of Wannier-Stark(WS) resonancesand Bloch oscillations will be carried out by using calculation of tranmittance of SPP propagating along the vacuum and metallic surface characterized by an analytic function. We intend to confirm the existence of SPP WS resonances arising from couplingof the surface states that do not have trivial quantum counterparts due to the vectorial nature of the SPP.We also plan to explore new regimes by varying of material and geometrical parameters and by introducing modulation of an external electric field.
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