title: Excitation of dark multipolar plasmonic resonances at terahertz frequencies.
abstract: We experimentally observe the excitation of dark multipolar spoof localized surface plasmon resonances in a hybrid structure consisting of a corrugated metallic disk coupled with a C-shaped dipole resonator. The uncoupled corrugated metallic disk only supports a dipolar resonance in the transmission spectrum due to perfect symmetry of the structure. However, the dark multipolar spoof localized surface plasmon resonances emerge when coupled with a bright C-shaped resonator which is placed in the vicinity of the corrugated metallic disk. These excited multipolar resonances show minimum influence on the coupling distance between the C-shaped resonator and corrugated metallic disk. The resonance frequencies of the radiative modes are controlled by varying the angle of the C-shaped resonator and the inner disk radius, both of which play dominant roles in the excitation of the spoof localized surface plasmons. Observation of such a transition from the dark to radiative nature of multipolar spoof localized plasmon resonances would find potential applications in terahertz based resonant plasmonic and metamaterial devices.
authors.affiliation: Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.affiliation: Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China.
authors.forename: YuMing
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China.
authors.forename: XiaoFei
authors.initials: X
authors.lastname: Zang
authors.affiliation: Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China.
authors.forename: YiMing
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Shanghai Key Lab of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China.
authors.forename: SongLin
authors.initials: S
authors.lastname: Zhuang