We report fabrication of THz fiber Bragg gratings (TFBG) using laser inscription on subwavelength step-index polymer fibers. A fiber Bragg grating with 48 periods features a -wide stop band and transmission loss in the middle of a stop band. The potential of such gratings in the design of resonant sensors for the monitoring of paper quality is demonstrated. Experimental spectral sensitivity of the TFBG-based paper thickness sensor was found to be . A 3D electromagnetic model of a Bragg grating was used to explain experimental findings.
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