Field enhancement by plasmonic contour H-shaped nano-antenna Milad Gharibi, Habib Khoshsima, Babak Olyaeefar and Sirous Khorram Eur. Phys. J. D, 68 5 (2014) 114 Published online: 09 May 2014 DOI: 10.1140/epjd/e2014-40543-7