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.

Chipless RFIDs by using metasurfaces

“…However, such completely passive devices, differently from conventional chipped tags, can be easily scaled in the THz regime as valid tagging, tracking or anti-counterfeiting technology for very small objects. As matter of fact, nowadays fabrication of periodic selective surfaces at THz frequencies is common practice for several research groups worldwide [15]- [16], whereas the implementation of chip in the THz regime is a very challenging task. The advantage of employing periodic surfaces for THz chipless tags would also be in terms of radar cross section control.…”

THz spatial filter employing bimaterial switching for temperature sensing

“…Terahertz (THz) technology has rapidly become attractive in recent years due to its potential for applications in communications, imaging, and especially in sensing [1][2][3][4][5][6][7]. THz sensors/ detectors are one of system in this band that has been identified for detecting hidden explosives, chemical and biological agents.…”

A novel 2nd-order bandpass MFSS filter with miniaturized structure

“…[1][2][3][4] As an artificially composite material which is composed of metamaterial and frequency selective surface (FSS), the metamaterial frequency selective surface (MFSS) can be used for the BPF applications because of its good frequency selective properties. 5,6 In general, frequency selective properties of the traditional BPF have to follow two basic principles.…”