Page 82 - kahroba41

1402 زییاپ - 41 هرامش ابرهک - رتویپماک و قرب یسدنهم یصصخت همانلصف

A new photonic crystal fiber biosensor using

surface plasmon

Mehran Karimian rizi Master of Medical Engineering ,
University, Tabriz, Iran,
mehrankarimian97@ms.tabrizu.ac.ir
Maryam Farivar Coach of technical and vocational
education organization of the country
Shahin Shahr, Iran,
Farivar.maryam@yahoo.com

Abstract: A new photonic crystal fiber (PCF) biosensor based on surface plasmon

resonance (SPR) phenomenon is proposed. In terms of chemical stability of the active
plasmonic material gold (Au) and the sensor layer outside the fiber structure, it is used
to simplify the sensor configuration. The proposed sensor can detect unknown analytes
flowing on the metal surface or dripping on the outer surface of the metal layer. The
proposed sensor consists of symmetrical circular air holes. Two small air holes are used
in the second ring. which helps to generate the field and also helps to adjust the phase

matching between the guided state of the nucleus and the surface plasmon teppolaritons
(SPP). Surface plasmons are excited along the metal surface by the guided mode of the
leakage-like Gaussian kernel. The guiding properties and the sensing performance are
numerically investigated by the Finite Element Method (FEM). A perfectly matched
circular layer is used to absorb the radiation towards the surface. The sensor offers a

maximum sensitivity of 1000nm/RIU with a sensor resolution of less than 1×〖10〗
^(-4) RIU.The proposed sensor design shows promising results that can be used in the
detection of biological and biochemical analytes.

Keywords: Photonic crystal fiber, Surface plasmon resonance, Fiber optic sensors

81