Synthesis of gold nanowires using laser ablation for improved colon biosensor

Abstract

Gold nanowires (Au NWs) were prepared using 9 nsec ND-YAG laser ablation in Ethanol employing 532 nm and 1.064 nm wavelengths. The colloidal solution was investigated depending on the X-ray diffraction (XRD) technique, the photoluminescence (PL) spectra, and Ultraviolet-Visible (UV-VIS) spectroscopy. The FESEM results reveal the formation of smaller Nano rode size at Second-harmonic generation (SHG) wavelength where found to be about (30 nm at wavelength 532 nm and 0.44 μm at 1064nm). Using Finite Element Analysis the simulation of photonic crystal fiber (PCF) as biosensors were done, depended on surface plasmon resonance (SPR) phenomenon using COMSOL Multiphysics program. The hollow core-photonic crystal fiber (HC-PCF) HC-800 was thus overfilled with (water). The confinement loss (CL) of the fundamental mode for the proposed PCF with and without the gold nanoparticles was calculated, we observe without gold NPs the CL at the water and Colon tissue about (1.08E+03, 5.46E+02) dB/m, while at use the deposited PCF with gold NPs the results ensured the decrease more than in the confinement loss at the water and Colon tissue about (1.01E+03, 3.16E+02) dB/m with a clear shift toward higher wavelengths.