Journal
OPTICS EXPRESS
Volume 23, Issue 21, Pages 27361-27368Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.027361
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Funding
- Research Project for Basic & Forefront Technology of Henan Province, China [132300410301]
- Key Research Project for Science and Technology of the Education Department of Henan Province, China [13B430181, 15B140007]
- National Natural Science Foundation of China [11575090]
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Plasmon-induced transparency (PIT) is a result of destructive interference of different plasmonic resonators. Due to the extreme dispersion within the narrow transparency window, PIT metamaterials are utilized to realize slow light and nonlinear effect. However, other applications such as broadband filtering more desire a broad transmission frequency band at the PIT resonance. In this paper, a broadband PIT effect is demonstrated theoretically in a planar terahertz metamaterial, consisting of a U-shaped ring (USR) supporting electric and magnetic dipole modes as the bright resonator and a cut wire pair (CWP) possessing planar electric quadrupole and magnetic dipole modes as the dark resonator. The dark resonant modes of the CWP can be excited simultaneously via near-field by both the electric and magnetic dipole modes of the USR. When the electric as well as magnetic excitation pathways constructively interact with each other, the enhanced near-field coupling between bright and dark resonators gives rise to an ultra-broad transparency window across a frequency range greater than 0.61 THz in the transmittance spectrum. (C) 2015 Optical Society of America
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