High-Q Terahertz Fano Resonance with Extraordinary Transmission in Concentric Ring Apertures
Journal Article - Open Access
1Department of Electrical and Computer Engineering, Rice University Houston United States
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We experimentally demonstrate a polarization-independent terahertz Fano resonance with extraordinary transmission when light passes through two concentric subwavelength ring apertures in the metal film. The Fano resonance is enabled by the coupling between a high-Q dark mode and a low-Q bright mode. We find the Q factor of the dark mode ranges from 23 to 40, which is 36 times higher than Q of bright mode. We show the Fano resonance can be tuned by varying the geometry and dimension of the structures. We also demonstrate a polarization dependent Fano resonance in a modified structure of concentric ring apertures.
- Atomic and Molecular Physics and Spectroscopy