Bismuthene-Coated Fiber-Optic Plasmonic Sensor: Theoretical Foundation for the Experimental Detection of Human Colorectal Cancer

AbstractIn this paper, we propose an approach to the detection of colorectal cancer (CRC) using an uncladded fiber optic plasmonic sensor with the help of silver thin film and a bismuthene nanolayer. Bovine serum albumin (BSA) is coated over bismuthene to provide favorable conditions for the attachment of path mucosa. The colorectal tissue sample is made up of the interstitial fluids (ISF) and different scatterers. In this paper, the volume fraction of scatterers in the pathological tissue sample (fSP) is varied from 35 to 75%. Performance-defining parameters such as resonance wavelength ( λr), shift in λr ( δλr), minimum transmittance (Tmin), and bandwidth (BW) based on transmittance curves are determined. In addition, field intensity –based parameters, i.e., penetration depth (PD), are also determined. It is found that δλr, BW, and PD increase while Tmin decreases by moving from normal mucosa to path mucosa and further increasing its fSP. The addition of bismuthene increases PD and does not have much impact on δλr and Tmin but degrades the resolution by increasing the BW. Further, the addition of BSA does not have much impact on Tmin, BW, and PD but slightly reduces the δλr. A higher PD for the proposed structure indicates the advantage of the addition of bismuthene (2D material). Finally, the comparison table reveals that the proposed sensor is highly sensitive with respect to the recently reported fiber-optic SPR sensor. Therefore, it is believed that the prop...
Source: Plasmonics - Category: Biomedical Science Source Type: research