Volume 117, Number 3, February 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||31 March 2017|
Ultra-wide band reflective metamaterial wave plates for terahertz waves
1 State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University - Shanghai 200438, China
2 Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, and Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University - Beijing, 100048, China
3 Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University - Shanghai 200433, China
4 Collaborative Innovation Center of Advanced Microstructures - Nanjing 210093, China
Received: 23 January 2017
Accepted: 15 March 2017
Terahertz (THz) electromagnetic waves have important applications in science and technology but available functional devices suffer from the issues of bulky size, low efficiency and narrow bandwidth. Here, based on Jones matrix and Poincaré sphere analyses, we present a set of general criterions to help design high-efficiency ultra-wide band THz wave plates using ultra-thin reflective metamaterials. Two half-wavelength and one quarter-wavelength THz wave plates are designed and fabricated based on the general criterions, and their excellent polarization manipulation capabilities are demonstrated experimentally. In particular, the realized devices, with thicknesses ∼ λ/7, exhibit polarization-conversion efficiencies higher than 80% in ultra-wide working bandwidths (relative bandwidth >80% at about ∼ 0.7 THz).
PACS: 78.67.Pt – Multilayers; superlattices; photonic structures; metamaterials / 42.25.Ja – Polarization / 87.50.U- – Millimeter/terahertz fields effects
© EPLA, 2017
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