Dual core four open channel circularly slotted gold coated plasmonic biosensor

• Published in: Optical materials express 2021-02, Vol.11 (2), p.273
• Main Authors: Sakib, Nazmus, Hassan, Walid, Kamrunnahar, Q. M., Momtaj, Maliha, Rahman, Thouhidur
• Format: Article
• Language: English
• Subjects: Acetone; Amplitudes; Biomolecules; Biosensors; Cornea; Crystal fibers; Ethanol; Figure of merit; Finite element method; Fused silica; Gold; Gold coatings; Interrogation; Kerosene; Linearity; Open channels; Photonic crystals; Plasmonics; Polytetrafluoroethylene; Refractivity; Sensors; Silicon dioxide; Spectral sensitivity
• ISSN: 2159-3930; 2159-3930
• DOI: 10.1364/OME.415502

In this paper, a four open channel dual-core photonic crystal fiber (OC-DC-PCF) refractive index (RI) sensor is numerically investigated by finite element method (FEM) based software for the detection of unknown biomolecules. To create the surface plasmon resonance (SPR) effect, novel plasmonic material gold (Au) is externally deposited to the selected slotted region which makes this design cost-effective. We obtain the maximum wavelength sensitivity (WS) 38000 nm/RIU and the amplitude sensitivity (AS) of 1286 RIU−1 by using wavelength and amplitude interrogation method respectively. The average spectral sensitivity is 6308 nm/RIU. The maximum figure of merit (FOM) of 760 RIU along with the maximum sensor resolution of 2.63×10−6 RIU is achieved within the analyte RI range of 1.33 to 1.45 for this design which is better than the reported existing works. According to its high sensitivity and cost-effective nature, large detection range, high linearity and FOM, low propagation loss, and low fabrication complexity- it can be an appreciable competitor in the region of bio sensing. The proposed sensor can detect successfully the biomolecules like water, ethanol, fused silica, silicone oil, kerosene, acetone, glucose solution, Teflon, cornea, lens, liver and intestinal mucosa of human etc.