Journal
OPTICS LETTERS
Volume 43, Issue 12, Pages 2977-2980Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.002977
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- RIKEN SPDR program
- Japan Society for the Promotion of Science (JSPS) [KAKENHI (17K18368)]
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This Letter describes a novel metamaterial design by employing off-resonance and in-resonance excitation for a high-transmission terahertz-wave quarter-wave plate (QWP). The device is demonstrated with a thin film metamaterial with double-layer split ring resonators (SRRs). Different from a usual resonant metamaterial device, here we design the work frequency off from the inductor-capacitor (LC) resonance for the TE mode, while in a dipole resonance for the TM mode to obtain the artificial birefringence. Rectangular SRRs in this Letter provide a choice to optimize the off-resonance and in-resonance excitation, to assist the double-layer design for high transmission. Converting a linearly polarized wave to circular polarization with our QWP, the experiment confirms a transmittance of 0.8 and an ellipticity of 0.99 at 0.98 THz. The developed thin film device is flexible and has a thickness of 48 mu m (sub-wavelength). This is an advantage for potential integration in systems where overall device compactness is required. (C) 2018 Optical Society of America
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