Design of subwavelength optical fibre for low-loss Terahertz transmission N. F. Ren, M. Y. Chen, B. Sun and L. Ge J. Eur. Opt. Soc.-Rapid Publ., 8 (2013) 13068 Published online: 03 October 2013 DOI: 10.2971/jeos.2013.13068