Application of metal-clad antiresonant reflecting hollow waveguides to tunable terahertz notch filter.
A novel tunable terahertz notch filter is demonstrated using antiresonant reflecting hollow waveguides with movable metal layers outside dielectric claddings. Based on the Fabry-Pérot resonance of the dielectric cladding, multiple deep notches are observed in a broad THz transmission spectrum. Continuous shift of notch frequencies is for the first time experimentally observed by lateral translation of metal layers from dielectric claddings. The measured maximum frequency-tuning-range approached 60GHz, equaling to 50% of the bandwidth of every passband, and a 20dB rejection notch-depth with a linewidth as narrow as 6GHz at frequency of around 0.2THz was also achieved. Numerical simulations match the measurements and verify the spectral-tuning mechanism.
Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan. jayu@mail.ncku.edu.tw
Ja-Yu
JY
Lu
Hao-Zai
HZ
Chen
Chih-Hsien
CH
Lai
Hung-Chun
HC
Chang
Borwen
B
You
Tze-An
TA
Liu
Jin-Long
JL
Peng