List of Articles plane wave expansion 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 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 Open Access Article Abstract Page Full-Text 3 - Novel Four-Channel All Optical Demultiplexer Based on Square PhCRR for Using WDM Applications Vahid Fallahi Mahmood Seifouri