An asymmetrical H-shaped resonator (ASH) has been designed using gold on a fused silica substrate. The aim is to
obtain a high - quality factor at the reflectance resonance peaks in the mid - infrared wavelength of 2 μm to 8 μm. The
structures were modelled using the Finite Difference Time Domain (FDTD) Lumerical Solution simulation software by
adjusting the parameter of periodic boundary condition on the X and Y-axis and perfectly matched layer (PML) on the
Z- axis. The asymmetric structures give double resonance peaks that depend on the arm-length of the structure. The
periodicity along the X and Y-axis was varied to tune the width of the resonant peaks in order to obtain the maximum Qfactor.
Experimental results broadly confirm the simulations.
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