Abstract
Optical properties of the photonic crystal covered with a perforated metal film were investigated and the existence of the Fano-type resonances was shown. The Fano resonances originate from the interaction between the optical Tamm state and the waveguide modes of the photonic crystal. It manifests itself as a narrow dip in a broad peak in the transmission spectrum related to the optical Tamm state. The design of a sensor based on this Fano resonance that is sensitive to the change of the environment refractive index is suggested.
Highlights
Optical Tamm state, which can occur either on the boundary of two photonic crystals [1, 2] or on the boundary of a photonic crystal and a metal film [3,4,5,6,7,8,9,10,11,12], has recently attracted attention of researchers in nano-optics community
The Fano resonances originate from the interaction between the optical Tamm state and the waveguide modes of the photonic crystal
It manifests itself as a narrow dip in a broad peak in the transmission spectrum related to the optical Tamm state
Summary
Optical Tamm state, which can occur either on the boundary of two photonic crystals [1, 2] or on the boundary of a photonic crystal and a metal film [3,4,5,6,7,8,9,10,11,12], has recently attracted attention of researchers in nano-optics community. We show that it is possible to achieve an interaction between waveguide modes of the photonic crystal and the Tamm state with the help of a periodic lattice of slits in a metal film. In the previous works [8, 9], it has been shown that the optical Tamm state can be excited in this system at the vacuum wavelength of about 800 nm This system supports surface plasmon modes localized at the surfaces of the metal film and modes that are localized inside the photonic crystal — we will call them waveguide modes. If we choose to intersect these modes at kxT,B=z k=xT 0 , i.e. at the normal incidence, the condition (2) reduces to:
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