Spectral characterization of a photonic bandgap fiber for sensing applications

Abstract

We study the measurand-induced spectral shift of the photonic bandgap edge of a hollow-core photonic crystal fiber. The physical measurands considered are strain, temperature, curvature, and twist. A noticeable sensitivity to strain, temperature, and twist is observed, with a blueshift to increase strain and twist. An increase in temperature induces a redshift. On the other hand, curvature has no observable effect on the spectral position of the photonic bandgap edge.

An HC-PCF Fluorescence Spectrocopy for Detection of Microsphere Samples Based on Refractive Index Scaling Law

“…The transmission bands, or transmission windows, of the HC-PCF is decided by the spacing between the holes of the capillaries (pitch), the hole diameters of the capillaries, and/or the air-filling content within the inner cladding. When the holey regions of HC-PCFs are filled with aqueous solution, the transmission window shows a blue shift [14][15][16][17][18]. This approach is in analogous with the wellknown scaling laws that describe the shift in the PBG edge which is derived from scalar waveguide approximation [14,15].…”

“…The application of HC-PCF as a refractive index sensor based on RI scaling laws has also been reported [17]. Recently, the dependence of PBG edge shift on the physical measurands such as strain, temperature, curvature, and twist are studied [18]. In this context, this paper investigates the influence of shift in central wavelength on the fluorescence emission intensity in common fluorescence sensing studies employing HC-PCFs.…”

An investigation into the fundamentals of trapping and sensing in microstructured photonic crystal fibers

“…When using conventional solid optical fibers for evanescent wave sensing, the protective fiber coating and cladding needs to be removed to ensure an overlap between the optical field and the sample it probes. When the holey regions of HC-PCFs are filled with aqueous solution, the transmission window shows a blue shift [78,79,80,81]. This approach is in analogous with the well-known scaling laws that describe the shift in the PBG edge which is derived from scalar waveguide approximation [78].…”

“…The application of HC-PCF as a refractive index sensor based on RI scaling laws has also been reported [80]. Recently, the dependence of PBG edge shift on the physical measurands such as strain, temperature, curvature, and twist are studied [81].…”