Design of metal mesh THz filters exploiting adjoint sensitivity analysis

We introduce a novel approach for tuning the bandwidth of metal mesh THz filters. Our approach utilizes the adjoint sensitivity with respect to user-defined shape control parameters. Derivative-based optimization is exploited to evolve the initial template of the filter to a new design which satisfies the design specifications. We suggest a smoothing step for the sharp metallic edges that can be implemented in the final structure. Examples are presented to illustrate the efficiency of the technique in tuning the filter’s bandwidth.