Han, Jiaguang Media 1: Probing negative refractive index of metamaterials by terahertz time-domain spectroscopy Originally published in Optics Express on 21 January 2008 (oe-16-2-1354) Optics Express;media;21 January 2008;terahertz time-domain spectroscopy;metamaterial;oe 2008-01-21
    https://opticapublishing.figshare.com/articles/media/Media_1_Probing_negative_refractive_index_of_metamaterials_by_terahertz_time-domain_spectroscopy/4938326
10.1364/OE.16.001354.m001