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In order to observe the extraordinary optical transmission (EOT) through a metal gratings induced by Tamm plasmon polaritons (TPPs),a layered structure consisting of a distributed Bragg reflector covered by a one-dimensional metal grating has been proposed in this paper.When an incident light wave passing through DBR regime and impinging on the DBR-metal interface normally,the generation of TPPs and the resultant highly localized energy on the metal-DBR interface have been simulated in detail by the finite element method.As a result,the surface plasmon polaritons (SPPs) modes accommodated inside the slits of metal gratings can be excited more effectively by the enhanced electromagnetic field associated with TPPs located on the interface.Furthermore,the enhanced transmission of incident light waves in the structure can be achieved when the SPPs mode inside the grating slits satisfies the Fabry-Perot (FP) like resonance condition,which reveals that EOT in this structure comes from a TPPs-FP hybrid resonance.This inference can be confirmed by the relationship between the central wavelengths of the two transmission peaks and the gratings heights shown in Fig.1(a),and the magnetic field modal profiles associated with the two peaks depicted in Fig.1(b).Quantitative impacts of the slits width and duty cycle on the transmission peaks of the metal grating have been analyzed numerically,the results demonstrated that when the period is determined,as the slits width increases,the two peak transmittances first increase and then decrease.On the other hand,when the three slit widths are chosen to be 40 nm,50 nm,and 60 nm respectively,the peak transmittance first increases and then decreases with the increasing duty cycle as shown in Fig.2(a).Meanwhile,it is found that the center wavelengths of the transmission peaks are related to the duty cycle in a nearly linear manner for three slit widths as displayed in Fig.2(b),which can be used to adjust flexibly the center wavelength of extraordinary optical transmission.
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Keywords:
- Extraordinary optical transmission /
- metal grating /
- Tamm plasmon polaritons /
- quasi Fabry-Perot resonance
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