List of Articles Optical Devices Open Access Article Abstract Page Full-Text 1 - Ultra-fast 1-bit comparator using nonlinear photonic crystalbased ring resonators Seyyed Mohammad Hosein Jalali Mohammad Soroosh Gholamreza Akbarizadeh Open Access Article Abstract Page Full-Text 2 - Ultra-Fast All-Optical Half Subtractor Based on Photonic Crystal Ring Resonators Mohammad Soroosh Atefeh Mirali Ebrahim Farshidi