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(a) Transmission spectrum of the Air-6 800 photonic crystal fiber (provided by Crystal Fiber). (b) Micrograph of the cross section of the HCPCF. (c) Probing tip of the HCPCF after postfabrication processing. (d) Enlarged view of (c).
Schematic of the LCPCF SERS sensor and its cross-sectional view. The spectrometer above the surface contains a charge-coupled device detector, a monochromator, and electronics for data collection.
(a) Curve A: Background Raman spectrum of the HCPCF. Curve B: R6G Raman spectrum obtained using a HCPCF SERS probe without the postfabrication processing; the HCPCF was dipped into the nanoparticle/R6G solution. Curve C: Subtraction of curve A from curve B showing the net R6G Raman signal. (b) Human insulin SERS spectrum obtained using a LCPCF SERS probe after the postfabrication processing. The fiber background has been subtracted. (c) Comparison of SERS intensities between tryptophan obtained from the postprocessed LCPCF SERS probe and that obtained directly from a dried nanoparticle/analyte film.
Some of the confined modes of a PCF when the hollow core is empty or filled with liquid, respectively.
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