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- Title
Octagonal PCF with Square-Core for Surface Enhanced Spectroscopic Properties: a New Frontier in Terahertz Chemical Sensing.
- Authors
Ferdous, A. H. M. Iftekharul; Akter, Bilkis; Priya, A.; Leo, L. Megalan; Prabu, R. Thandaiah; Sathi, Benjir Newaz; Kundu, Diponkar; Sadeque, Md. Golam; Islam, Md. Shahareaj; Ahammad, Shaik Hasane; Rashed, Ahmed Nabih Zaki
- Abstract
Terahertz (THz) spectroscopy has become a potent tool for label-free, non-destructive chemical sensing, with applications that range from security screening to pharmaceutical investigation. To expand the possibilities of THz spectroscopy, it is essential to improve its sensitivity and selectivity. In this study, we present a brand-new optical fiber design that is specifically suited to take use of surface-enhanced spectroscopic features in the terahertz range: an octagonal photonic crystal fiber (PCF) with a square core. According to this analysis, a five-layer construction with square air openings for the core and cladding and an octagonal shape would be best. The mathematical study is accomplished using the PML's boundary condition with a finite element method (FEM) at the propagation of THz waves. The developed octagonal PCF sensor accomplishes exceptionally high relative sensitivity (90.65%, 91.93%, 93.06%) at 1.3 THz for three compounds, including water (n = 1.330), ethanol (n = 1.354), and benzene (n = 1.366), following the simulation method. In contrast, for the same three compounds at 1.3 THz, the low confinement loss (CL)'s are 2.12 × 10−13 dB/m, 2.00 × 10−13 dB/m, and 1.88 × 10−13 dB/m, respectively. In addition, we investigated the possible uses of this unique fiber in numerous industries, such as chemical sensing, environmental monitoring, and biomedical diagnostics. In terms of terahertz chemical sensing, the octagonal PCF with square core opens up previously untapped possibilities for the creation of highly sensitive and selective THz spectroscopic devices with significant societal implications.
- Subjects
PHOTONIC crystal fibers; FINITE element method; TERAHERTZ spectroscopy; ENVIRONMENTAL monitoring; OPTICAL fibers
- Publication
Plasmonics, 2024, Vol 19, Issue 3, p1257
- ISSN
1557-1955
- Publication type
Article
- DOI
10.1007/s11468-023-02074-7