Giant Goos-Hänchen Shift With High Reflectivity via Double Metal-Dielectric-Metal Waveguides Induced Fano Resonance

A theoretical scheme to achieve a giant Goos-Hänchen shift with high reflectivity via double metal-dielectric-metal (MDM) waveguides induced Fano resonance is proposed. Due to an additional thinner planar waveguide is attracted to the symmetrical metal cladding waveguide with sub-millimeter scale, the interference interaction between different Q-value guided modes would generate an asymmetric Fano reflectivity curve. Around the reflectivity peak of Fano curve, the phase of the reflected light changes rapidly and thus the Goos-Hänchen shift can be greatly enhanced without much attenuation. Numerical calculations based on the Gaussian model confirm the theoretical analysis and show that our enhancement scheme is not limited to TM polarization, which is different from the case of metal-dielectric multilayer Fano structure.