Enhanced sensing performance of tapered profile in the apodized fiber Bragg grating for detection of cancerous cells utilizing their refractive index

Tapered profiles are introduced in Bessel and Blackman apodized fiber Bragg grating, and their sensing performance is theoretically estimated. Reflectivity equation of proposed apodized tapered profiles is obtained using transfer matrix method and coupled mode theory. Since the effective refractive...

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Veröffentlicht in:Journal of biophotonics 2023-12, Vol.16 (12), p.e202300237-n/a
Hauptverfasser: Maiti, Souryadipta, Prakash, Suraj, Singh, Vivek
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Sprache:eng
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Zusammenfassung:Tapered profiles are introduced in Bessel and Blackman apodized fiber Bragg grating, and their sensing performance is theoretically estimated. Reflectivity equation of proposed apodized tapered profiles is obtained using transfer matrix method and coupled mode theory. Since the effective refractive index (RI) of proposed waveguides varies with core radius therefore amplitude distribution and penetration depth of light in surroundings are modified. It is found that the exponential tapered profile with Bessel apodization shows a higher sensitivity of 682.5 nm/RIU, detection accuracy of 3858.45, and quality parameter 1718.02/RIU with minimum full width at half maxima (FWHM) 0.3972 nm of the reflection spectra. The spectral response of the tapered fiber Bragg grating is also analyzed through a group delay study. Again, exponential profile was found to be particularly effective, producing less group delay ripples 2.98 ps and is maximum slope of 42.43°. Hence, exponential tapered profile is demonstrated for detection of cancer cells lies between the refractive index of 1.3333–1.4412. Structural modification using exponential taper profile with Bessel apodization shows large impact on sensing performance over conventional FBG sensors. The proposed structure also minimized signal delay ripples to 2.98 ps and achieved a steep 42.43° slope, ensuring efficient and precise sensing in various applications. This innovation holds promise for detecting cancer cells within a RI range of 1.3333–1.4412.
ISSN:1864-063X
1864-0648
DOI:10.1002/jbio.202300237