Dual-Core Photonic Crystal Fiber-Based Plasmonic RI Sensor in the Visible to Near-IR Operating Band

Milled Microchannel-Assisted Open D-Channel Photonic Crystal Fiber Plasmonic Biosensor

“…This causes the propagation loss to get elevated at resonant wavelengths due to the leaky gaussian nature of the core mode under such conditions. This confinement loss has a linear relation with effective mode index imaginary part Im(neff) [10]…”

“…Fused silica is employed as the base material because of its low absorption loss as well as high mechanical strength. The Sellmeier's equation dictates the fused silica RI, [26]: The RI of gold can be calculated as [10]:…”

“…, , Γ L , Ω are the plasma frequency, damping frequency, spectral width, and oscillator strength of Lorentz oscillators, respectively. All the parameters for the above equation are taken from [10]. A thin TiO2 layer is placed between gold and silica for strengthening the attachment of gold with silica.…”

“…TiO2 also raises the interaction between surface plasmons and its joining material, gold. The RI of titanium oxide can be expressed as [10]:…”

“…Gold is more preferred due to its higher chemical stability and higher resonance wavelength peak shifts. One of the most sensitive photonic crystal designs with only circular arrangements has been proposed in [10], where the highest wavelength sensitivity, Sλ is 28,000nm/RIU and the maximum amplitude sensitivity SA is 6829 RIU -1 . The RI sensing range of the analyte lies in 1.33-1.42 RI.…”