Abstract
This Letter describes a novelmetamaterial design by employing off-resonance and in-resonance excitation for a hightransmission 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 μm (sub-wavelength). This is an advantage for potential integration in systems where overall device compactness is required.
Originalsprog | Engelsk |
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Tidsskrift | Optics Letters |
Vol/bind | 43 |
Nummer | 12 |
Sider (fra-til) | 2977-2980 |
Antal sider | 4 |
ISSN | 0146-9592 |
DOI | |
Status | Udgivet - 15 jun. 2018 |
Udgivet eksternt | Ja |