Detection of Marijuana in blood using GaAs substrate based photonic sensor

Marijuana apart from its slight usage in certain medical departments is a very harmful drug if consumed on a regular basis. Detection of Marijuana in blood is a must to identify the addicted person and provide treatment. In current study, we have proposed detection and analysis of drugs in blood by using the Photonic Crystal (PHC) based sensor. A two-dimensional PHC based double ring resonator structure is thereby used to detect its presence. Here, we have used GaAs (Gallium Arsenide) substrate. The objective is to provide fabricator an ideal basis for the production ready design. While designing our emphasis was not compromise on efficiency and sensitivity of the device. MEEP Simulation tool was used for implementation of Finite Difference Time Domain (FDTD) method for modelling the double ring resonator structure. Output transmitted spectrum shows shift in frequency because of change in refractive index due to presence of Marijuana in blood (analyte). The sensor can differentiate between the signature of normal and drug infected blood. A high quality factor obtained of 27,692 for normal blood and 17,149 for marijuana contaminated blood. The novelty of the work is use of GaAs and double ring resonator structure.