Journal
OPTICS EXPRESS
Volume 21, Issue 9, Pages 10642-10650Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.010642
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Funding
- Photon Frontier Network Program
- KAKENHI [20104002]
- Special Coordination Funds for Promoting Science and Technology of MEXT, Japan
- JSPS through its FIRST Program
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Bare metal wires have recently been demonstrated as waveguides for transporting terahertz (THz) radiation, where the guiding mode is radially polarized surface Sommerfeld waves. In this study, we demonstrate high-efficiency coupling of a broadband radially polarized THz pulsed beam, which is generated with a polarization-controlled beam by a segmented half-wave-plate mode converter, to bare copper wires. A total coupling efficiency up to 16.8% is observed, and at 0.3 THz, the maximum coupling efficiency is 66.3%. The results of mode-overlap calculation and numerical simulation support the experimental data well. (c) 2013 Optical Society of America
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