Theoretical Analysis of Dielectric Assisted Tamm Mode Excitation

In this paper, a dielectric material assisted excitation mechanism is proposed to confine Tamm Modes at the dielectric-air interface. The performance analysis of proposed structure is performed using transfer matrix method (TMM). The design comprises a bilayer one-dimensional photonic crystal structure having a top defect layer. The defect layer thickness, and incident angles are optimized to confirm the Tamm mode confinement at an operating wavelength of 632.8nm. The proposed structure shows a strong Tamm mode localization for a defect layer thickness of 210nm. Whereas an evanescent Tamm mode is also excited for a lower defect layer thickness of around 170nm.