Dey, Tanoy Kumar and Biswas, Palas and Basumallick, Nandini and Bandyopadhyay, Somnath (2023) Long-Period Fiber Grating Probe: An Improved Design Suitable for Biosensing. IEEE Sensors Journal, 23 (7). pp. 6886-6891. ISSN 1530-437X

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Abstract

Add-layer sensitivity of long-period fiber grating (LPFG) near mode transition (MT) has been studied in reflection configuration to realize a highly sensitive LPFG-based sensor probe suitable for biosensing. The dependency of the sensitivity on the separation between the resonant cladding modes considered during MT has also been investigated. The separation between two consecutive cladding modes was precisely increased or stretched to a desired value by reducing the cladding diameter. The probe was formed by cleaving the mode stretched LPFG (MSLPFG) through the grating region. The MSLPFG was designed to operate near MT by deposition of electrostatic self-assembled (ESA) polymeric overlay layers on the grating surface. We demonstrate that the polymeric overlay not only increases the sensitivity of the sensor but also eliminates undesirable multiple resonant bands that appear due to the introduction of arbitrary phase while cleaving the grating. Add-layer sensitivity of the MSLPFG sensor probe was obtained and found to be similar to 2.0 nmWL/nmTH with a significantly enhanced peak attenuation of similar to -30 dB around the MT region.

Item Type:	Article
Subjects:	Processing Science
Divisions:	Fiber Optics and Photonics
Depositing User:	Bidhan Chaudhuri
Date Deposited:	06 Oct 2023 12:21
Last Modified:	06 Oct 2023 12:21
URI:	http://cgcri.csircentral.net/id/eprint/5580

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