RT Journal T1 Semiconductor activated terahertz metamaterials A1 Hou-Tong CHEN PB Front. Optoelectron. FD 2015-02-13 YR 2015 JF Frontiers of Optoelectronics JO Front. Optoelectron. VO 8 IS 1 SP 27 DO 10.1007/s12200-014-0436-0 K1 terahertz;metamaterials;semiconductor;modulation LK {https://journal.hep.com.cn/foe/EN/article/article_10996.shtml}