Tailoring Metamaterial Microstructures to Realize Broadband Polarization Modulation of Terahertz Waves
Publication in refereed journal

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摘要We report ultrabroadband, easily tunable, and highly efficient metamaterial-based terahertz wave retarders that are able to convert linear polarization into elliptical and circular polarization states. The functional device consists of a metamaterial microstructure and a grating coupler patterned on each side of fused silica substrates. The dielectric response of the metamaterial microstructure and the angular dependent phase dispersion of the grating coupler allow tuning of the phase differences from -110° to 110° within the range of a few terahertz while keeping the magnitudes of the two orthogonally transmitted waves equal. In particular, a high degree of circular polarization (>0.99) can be achieved from 1.78 to 4.88 THz for a specific dielectric value of spacer material 2.8 and angle of incidence -13°. The experimental results in the accessible frequency range of 0.2-2.3 THz show good agreement with the numerical simulations. Our study opens new opportunities for manipulating the broadband polarization responses of terahertz waves. This facilitates the development of new functional devices based on metamaterials for terahertz imaging and spectroscopy.
著者Chunrui Han, Edward P.J. Parrott, Emma Pickwell‐MacPherson
期刊名稱IEEE Journal of Selected Topics in Quantum Electronics
出版年份2017
月份7
卷號23
期次4
出版社IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
頁次4700806
國際標準期刊號1077-260X
電子國際標準期刊號1558-4542
語言英式英語
關鍵詞Broadband waveplate, terahertz polarization modulation, plasmonic effect, polarization conversion
Web of Science 學科類別Engineering, Electrical & Electronic;Optics;Physics, Applied;Engineering;Optics;Physics

上次更新時間 2021-17-10 於 00:05