On-chip Superconducting THz Metamaterial Bandpass Filter

We demonstrate a THz bandpass filter (BPF) made from high-temperature (T
_c
) superconducting Bi
₂
Sr
₂
CaCu
₂
O
_8+δ
(BSCCO). The filter offers a thermally tunable dual passband with a flat response in the first passband, a bandwidth of ~ 0.33 THz, and a sharp resonance band-edge transition to the rejection bands of ~ 316 and 96 dB/THz (for left and right edge, respectively), at temperature T=10 K far below Tc. As temperature T increases, the sharpness of the band-edge transition to the rejection bands decreases. The proposed BPF can be useful in the realization of a superconducting based THz integrated circuitry.