Nicotine Sensing by Photonic Crystal Fiber in THz Regime

A PCF based nicotine detection technique in THz regime that is found in cigarette smoke is presented here. A square shaped PCF is designed where the cladding consists of four air hole layers and a solid square core is used for filling up the analytes. Some of the optical properties sequentially sensitivity, confinement loss, EML, and effective area are calculated for measuring the sensor performance in THz region of 1 THz to 2 THz. All the values are measured in three conditions namely at optimum air hole radius and optimum air hole radius ± 2%. From the simulation results a high sensitivity of 83% is achieved at 1.5 THz, besides the confinement loss becomes zero after 1.3 THz and also a low value of EML is found. A slightly higher sensitivity (83.8%) is attained at optimum air hole radius+2% but in this case the core-cladding spacing is reduced that will create a barrier in fabrication. Hence the optimum condition of our proposed model is chosen for fabrication flexibility.