Yeh Ting-Tso, Genovesi Simone, Monorchio Agostino, Prati Enrico, Costa Filippo, Huang Tsung-Yu, Yen Ta-Jen
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan.
Opt Express. 2012 Mar 26;20(7):7580-9. doi: 10.1364/OE.20.007580.
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.
我们展示了三种基于整体超材料的太赫兹带通滤波器，即倾斜圆形槽环、曲折槽和耶路撒冷十字槽，以适应太赫兹频段间隙。这些太赫兹带通滤波器由金属-电介质-金属（MDM）结构组成，该结构支持电偶极子、磁偶极子和类驻波模式的多重共振。通过激发并进一步混合这些单独的共振模式，我们展示了超越传统带通滤波器的出色性能，即具有宽带宽和尖锐的带边过渡。通过进一步采用我们特制的遗传算法（GA）和周期矩量法（PMM）来优化我们的设计，我们分别实现了高达82.2%的超宽3dB分数带宽和58.3 dB/倍频程的尖锐带边过渡，这有利于安全系统中的材料识别、成像和吸收器等实际应用。
