[1] Univ Cyprus, Dept Elect & Comp Engn, CY-1678 Nicosia, Cyprus
[2] Univ Kent, Dept Elect, Canterbury CT2 7NT, Kent, England
[3] Univ Politecn Valencia, Valencia Nanophoton Technol Ctr, Valencia 46022, Spain
[4] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[5] MINATEC INPG, Inst Microelect Electromagnetism & Photon, F-38016 Grenoble, France
[6] MINATEC INPG, Lab Hyperfrequences & Caracterisat, F-38016 Grenoble, France
[7] UCL, Dept Elect & Elect Engn, London WC1E 6BT, England
[8] Univ Sci & Technol Lille, UMR 8520, Inst Elect Microelect & Nanotechnol, Villeneuve Dascq, France
[9] Inst Rech Composants Logiciels & Mat Informat & C, FR 3024, F-59652 Villeneuve Dascq, France
[10] Budapest Univ Technol & Econ, Dept Broadband Infocommun & Electromagnet Theory, H-1111 Budapest, Hungary
[11] Univ Duisburg Essen, D-47057 Duisburg, Germany