A metamaterial based tunable terahertz bandpass filter and an algorithm to tune the resonant peak frequency

Abstract

A tunable metamaterial based bandpass filter working in the terahertz frequency region has been proposed in this paper. The bandpass filter's resonant peak frequency can be adjusted to any value between 0.75 THz to 1.25 THz by varying a single dimension in the unit cell of the proposed structure. At this peak frequency, the structure offers a high transmissivity which is greater than 89%. The paper also presents an algorithm, developed and implemented in C++ platform to make the tuning process easy. The developed algorithm has a calculable upper bound over the number of trails required to tune the structure to a desired resonant peak frequency. The proposed filter is expected to find application in terahertz communication, imaging and sensing whereas the developed algorithm can find application in tuning any device where the desired property changes monotonically with respect to its variable. © 2021 URSI.