Document Type : Research Paper

Authors

• Mahdi Sovizi ¹
• Maryam Aliannezhadi ²

¹ Faculty of Physics, Semnan University,

² Faculty of Physics, Semnan University

Abstract

The timely detection of human immunodeficiency virus (HIV) at the point of care (POC) can lead to timely medical measures, appropriate treatment, and reducing the growth rate and spread of the disease. In the paper, two HIV-1 biosensors based on a perfect 1-D photonic crystal and a 1-D PC containing a defect layer are proposed to detect the HIV virus, and the main characteristic parameters of the biosensors, including sensitivity and Q factor, are investigated. Also, the irradiation angle's effect on these two sensors' performance is evaluated. The results declare that the sensitivity of the HIV-1 biosensor based on the perfect photonic crystal is independent of the radiation angle. At the same time, the Q factor of this sensor increases with the increase of the radiation angle, and the value of this quantity under the irradiation angle of 85 degrees is almost 14 times greater than the normal irradiation. On the other hand, the sensitivity and Q factor of the biosensor containing the defect layer are dependent on the irradiation angle, and the maximum value of these quantities, which occur at the radiation angles of 65 and 47 degrees, are equal to 1056 nm/RIU and 12683, respectively. Therefore, this biosensor is suggested as a suitable candidate for HIV detection.

Keywords

• Biosensor
• Optical sensor
• One-dimensional photonic crystals
• Human immunodeficiency virus (HIV)

Main Subjects

• ATOMIC AND MOLECULAR PHYSICS