Abstract
The sensing performance of a linearly tapered and apodized fiber Bragg grating is estimated and optimized. Coupled mode theory in association with the transfer matrix method is utilized to develop the reflectance formula of the proposed sensor. The reflectance spectra of linearly tapered fiber Bragg gratings are plotted for various apodization profiles. The sensitivity, detection accuracy, and quality parameter of proposed sensor are compared with standard fiber Bragg grating and linearly tapered fiber Bragg gratings-based sensors. It is found that the tapering in the waveguide along with apodization further improves the sensing performance of the sensor. Although the maximum sensitivity 489 nm/RIU is obtained in Hamming apodization and maximum left side lobe − 152 dB is obtained in Barthann apodization function, these apodizations show poor detection accuracy and quality parameters due to their larger value of full width at half maxima of sensing signal. The Bessel apodization function shows maximum detection accuracy (1366) and quality parameter (420/RIU) in our all-considered linearly tapered apodized structures. Followed by Bessel apodized sensor, the Blackman apodized sensor also shows higher detection accuracy (1340) and quality parameter (412/RIU). Therefore, these two apodization functions are recommended for biosensing applications in such a tapered structure.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The author Souryadipta Maiti is thankful to DST-INSPIRE (Department of Science and Technology, Government of India, New Delhi) for providing fellowship for pursuing this work respectively. We also acknowledge support from the Institutions of Eminence (IoE) BHU Grant Scheme No. 6031.
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Authors are also acknowledged support from the Institutions of Eminence (IoE), Banaras Hindu University, Grant scheme No. 6031.
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SM has done the simulation work of the device structure and also developed the computational framework. SM and SP preparing the final draft. VS has devised the idea and helped while preparing the final draft and supervised.
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Maiti, S., Prakash, S. & Singh, V. Sensing performance of apodized fiber Bragg gratings having linearly tapered profile. Opt Quant Electron 55, 624 (2023). https://doi.org/10.1007/s11082-023-04888-5
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DOI: https://doi.org/10.1007/s11082-023-04888-5