Design and Analysis of Highly Sensitive Gold-immobilized PCF based SPR Biosensor

Numerical analysis of a surface plasmon resonance biosensor that makes use of a very sensitive photonic crystal fiber is presented in this article. A straightforward circular lattice of photonic crystal fiber is employed to create the biosensor, where a thin layer of chemically stable gold is immobilized on its surface. Additionally, a sensing medium layer is employed on the outer surface of the fiber to enhance the effectiveness of the structure. To evaluate the sensor's performance, numerical analysis is conducted through the use of a finite element simulation tool, which determines that the sensor offers optimum amplitude and wavelength sensitivity of 1980/RIU and 15000 nmRIU
⁻¹
for x-polarization, 1756/RIU and 19500 nmRIU
⁻¹
, respectively, for y-polarization. The biosensor exhibits exceptional spectral resolution, with a maximum value of 6.6667x10-
⁶
RIU and 5.128x10
⁻⁶
RIU for x- and y-polarization, respectively, indicating its ability to detect even the slightest refractive index change in analyte within 1.33 to 1.41. As a result of its remarkable sensing properties, the aforementioned sensor is anticipated to significantly contribute to precisely detecting organic, chemical and biological analytes.