Plasmonic fiber optic biosensors with barium titanate and titanium dioxide thin films

Kouhi, Mohammad; Ahmed Abdulqadir Shateri, Shahab; Vahedi, Ali

doi:10.47176/ijpr.22.2.91317

Plasmonic fiber optic biosensors with barium titanate and titanium dioxide thin films

Document Type : Original Article

Authors

Mohammad Kouhi ¹

Shahab Ahmed Abdulqadir Shateri ²

Ali Vahedi ³

¹ Department of Physics, Tabriz Branch, Islamic Azad University, Tabriz, Iran

² Department of Physics, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

³ 1Department of Physics, Tabriz Branch, Islamic Azad University, Tabriz, Iran

https://doi.org/10.47176/ijpr.22.2.91317

Abstract

In this paper, two structures of surface plasmon resonance fiber optic biosensors with the addition of a thin layer of titanium dioxide and barium titanate are introduced and studied comparatively. The sensitivity of these biosensors has been calculated using the transfer matrix method. Adding a thin layer of barium titanate and titanium dioxide after the gold layer, both make increase the sensitivity of the biosensor due to the transfer of free charge between the gold and the dielectric. The obtained results of the comparative study show that the titanium dioxide layer can be a suitable alternative to barium titanate for further increase of the sensitivity of the fiber optic surface plasmon resonance biosensor.

Keywords

surface plasmon resonance

optical fiber

biosensor

sensitivity of sensor

20.1001.1.16826957.1401.22.2.9.1

Subjects

Optics and Photonics

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