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A comparative study of Raman enhancement in capillaries
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Image of FIG. 1.
FIG. 1.

(Color online) Calculated normalized Raman intensity attained from the HCPCF (HC800) and the TCT with varying refractive index of the core.

Image of FIG. 2.
FIG. 2.

(Color online) Fitting of experimental data to Eq. (1) for (left) HC800 and (right) TCT. The intensities are normalized with respect to the intensity obtained with a cuvette. Insets: Predictable plateau of intensity for the LCW over the practical length scale. The first cladding mode in the infinite periodic structure often denoted as the fundamental space filling mode. By definition, this mode exhibits the highest effective index, zero transverse wavevector, and it fills all of the space. The value of is a function of the wavelength, λ, the dielectric constant of silica, ɛ silica, the air-hole pitch, and the cladding air-hole diameter d clad (Ref. 26 ).

Image of FIG. 3.
FIG. 3.

(Color online) Schematic diagram of the experimental setup. The solution of interest is injected into the central core of the LCW and excited by a HeNe laser.

Image of FIG. 4.
FIG. 4.

(Color online) (Top) Normal Raman spectra acquired using a TCT filled with different concentrations of NPT and methanol as a buffer. Concentration dependence curve for NPT Raman-active modes at (left-bottom) 430 cm−1, and (right-bottom) 1272 cm−1.

Image of FIG. 5.
FIG. 5.

(Color online) Comparison between the Raman spectra of methanol acquired using the TCT-based platform and the HCPCF-based platform.


Generic image for table
Table I.

Physical and optical parameters for air-guiding HCPCFs, which are used in this work.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A comparative study of Raman enhancement in capillaries