Identification of Cyanide within Hollow Core Photonics Crystal Fiber Md. Bellal Hossain Electronics and Communication Engineering Discipline Khulna University Khulna, Bangladesh Email: md.bellal.ku@gmail.com md.bellal.hossain.ece@ieee.org Etu Podder Electronics and Communication Engineering Discipline Khulna University Khulna, Bangladesh Email: e2.120926@gmail.com Abdullah Al-Mamun Bulbul Department of Electronics and Telecommunication Engineering Bangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalgonj, Bangladesh Email: bulbulmamun@yahoo.com Himadri Shekhar Mondal Member, IEEE Email: bdhimadri@gmail.com bdhimadri@ieee.org M. Raihan Department of Computer Science and Engineering North Western University Khulna, Bangladesh Email: raihanbme@gmail.com Md. Tanvir Islam Department of Computer Science and Engineering North Western University Khulna, Bangladesh Email: tanvirislamnwu@gmail.com Abstract—Nerve Cyanide is very dangerous especially for human body and for this reason, perfect extent identification of cyanide is very worthy. In this research, PCF based cyanide sensor is illustrated where, sodium cyanide (NaCN) and potas- sium cyanide (KCN) are taken as analyte. COMSOL Multiphysics is conducted for the simulation of recommended model. The recommended model exhibits 88.5% sensitivity while NaCN is chosen as analyte at frequency 1.3 THz. This model has very insignificant effective material loss (EML) and only 0.0050 cm -1 EML is noticed while KCN is chosen as analyte. Moreover, this recommended model has very negligible confinement loss (1.2×10 -13 dB/cm). Index Terms—PCF sensor, EML, Confinement Loss. I. I NTRODUCTION Nerve Cyanide is a chemical substance which sometimes acts like a colorless gas, again sometimes it seems like a crystal shape for instance NaCN, KCN etc. [1]. Cyanide is released from substances in some natural foods and some plants for instance chestnut, manioc, butter bean etc. Ditches’ and pips of apples, peaches and apricots also have carried certain extent of cyanide. Cigarette is also one of the main origins of cyanide disclosure [2]. Cyanide is used in several industries to make paper, petroleum as well as plastics. But it is mainly used to uplift photographs. Besides, its salts are used to electroplate, to clean metal, to extract gold etc. [3]. However, cyanide has also some harmful effect to human health for instance the exposure to larger extent of cyanide may cause injury of Lung, failure of Respiratory etc. Hence, it is very worthy to find out the perfect detection of cyanide. So far numerous methods of cyanide detection have been displayed [4-7], but problem is all of them have some problems for instance large analysis duration, complicated process as well as required expert user. To enlarge the accuracy of cyanide detection and to make more users friendly, researchers have proposed various new sensing techniques. Nowadays, Photonic Crystal Fiber (PCF) has gathered huge attention in optical communication [8-11] and also in optical sensing field [12- 15]. At the visible and near-infrared wavelengths PCFs can be designed and fabricated with low or zero dispersion properties and one particular benefit is that the dispersion will be flattened over a longer distance [16]. However, the tremendous capabilities of THz frequency make it significant in numerous areas of applications like communication applications, sensing, spectroscopy, astronomy, imaging (real-time imaging, non- destructive imaging), dermatology, defense purpose (military applications), security previewing, polarization maintaining, environmental applications, and security sensitive zones (i.e. hybridization of DNA, monitoring drugs) [17, 18]. II. RELATED WORKS The photonic crystal is composed of periodic dielectric or metallic-dielectric nanostructures that have alternate low and high dielectric constant materials (refractive index) to affect the propagation of electromagnetic waves inside the structure. By introducing the point and line defects inside the structure, it is possible to localize the light in the photonic bandgap (PBG) region. So many researches are going on to increase its applicable areas. Very recently, THz electromagnetic spectrum has attained a diverse attention for PCF based sensing [19]. In 2016, Arif et al. reported a sensor model with 58.5% sensitivity [20] at wavelength 1.3 μm and afterward, in 2017, Islam et al. represented a model with 85% sensitivity in THz regime [21]. In this research, we proposed a PCF based model to identify Cyanide which shows mesmerize sensing performance. IEEE - 45670 10th ICCCNT 2019 July 6-8, 2019, IIT - Kanpur Kanpur, India