title: Ultra-broad and sharp-transition bandpass terahertz filters by hybridizing multiple resonances mode in monolithic metamaterials.
abstract: We present three monolithic metamaterial-based THz bandpass filters, the skewed circular slot rings, meandered slots and Jerusalem cross slots, to fit in the THz gap. These THz bandpass filters are comprised of a metal-dielectric-metal (MDM) structure that supports multiple resonances of electric dipole, magnetic dipole, and standing-wave-like modes. By exciting and further hybridizing these individual resonance modes, we demonstrate excellent performance of broad bandwidth and sharp band-edge transition beyond conventional bandpass filters. By further employing our ad hoc Genetic Algorithm (GA) and Periodic Method of Moments (PMM) to optimize our designs, we achieve an ultra-broad 3dB fractional bandwidth and sharp band-edge transition up to 82.2% and 58.3 dB/octave, respectively, benefiting the practical applications such as material recognition in security systems, imaging, and absorbers.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan.
authors.forename: Ting-Tso
authors.initials: TT
authors.lastname: Yeh
authors.forename: Simone
authors.initials: S
authors.lastname: Genovesi
authors.forename: Agostino
authors.initials: A
authors.lastname: Monorchio
authors.forename: Enrico
authors.initials: E
authors.lastname: Prati
authors.forename: Filippo
authors.initials: F
authors.lastname: Costa
authors.forename: Tsung-Yu
authors.initials: TY
authors.lastname: Huang
authors.forename: Ta-Jen
authors.initials: TJ
authors.lastname: Yen
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D055053:Terahertz Radiation