Journal
OPTICS LETTERS
Volume 36, Issue 15, Pages 2901-2903Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.002901
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- U.S. National Science Foundation (NSF)
- National Natural Science Foundation of China (NSFC) [61028011]
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Arrays of subwavelength dipole bow-tie apertures are designed and characterized at terahertz frequencies. For an incident terahertz field perpendicular to the longer axis of the bow tie, a strong resonance enhancement, line narrowing, and a nonmonotonic frequency shift were observed with increasing length of the tapered bow-tie arms. Such characteristic behaviors primarily originate from localized surface plasmon resonances. In addition, with a decreasing aperture size, the contribution of localized plasmons becomes prominent due to an increase in plasmonic lifetime as the terahertz pulses strongly couple with the metallic surface surrounding the bow-tie apertures. (C) 2011 Optical Society of America
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