List of Articles effective refractive index Open Access Article Abstract Page Full-Text 1 - Investigation and Comparison of Light Propagation in Two Graded Photonic Crystal Structures Abdolrasoul Gharaati Nasrin Miri Zahra Zareian 20.1001.1.24237361.2017.2.1.6.0 Open Access Article Abstract Page Full-Text 2 - Studying Focusing Properties of Graded Index Photonic Crystals Made of Material with Different Refractive Index Nasrin Miri Abdolrasoul Gharaati 20.1001.1.24237361.2017.2.3.6.4