Enhanced transmission by a grating composed of left-handed materials Prabhakaran Letha Premlal, Dinesh Chandra Tiwari and Vandana Chaturvedi Eur. Phys. J. B, 91 5 (2018) 78 Published online: 02 May 2018 DOI: 10.1140/epjb/e2018-80571-5