Detection of haemoglobin concentration in blood samples using nanophotonic biosensor

Abstract

A biosensor device using one dimensional photonic crystal is designed for monitoring haemoglobin concentration in blood. Using the transfer matrix approach, the transmission spectra of a multilayered crystal structure (AB)7/ADA/(BA)7 is calculated. GaN is utilised as a media with a high refractive index (A), whereas air (B) is employed as a medium with a low refractive index. Here, defect layer (D) is chosen as blood sample. A resonant peak within photonic band gap can be shifted by a change in haemoglobin concentration in transmission spectrum. The sensor has the values of sensitivity, quality factor, figure of merit and detection limit as 439 nm/RIU, ∼4.91×105, ∼3.29×105/RIU and ∼ 3.03 ×10-7 RIU respectively.