[INVITED] Nanofabrication of phase-shifted Bragg gratings on the end facet of multimode fiber towards development of optical filters and sensors. (May 2018)

• Record Type: Journal Article
• Authors: Gallego, E.E.; Ascorbe, J.; Del Villar, I.; Corres, J.M.; Matias, I.R.
• Is Part Of: Optics & laser technology. Volume 101(2018)
• Page Start: 49
• Page End: 56
• Publication Date: 2018-05
• Subjects: Optical fiber components -- Bragg gratings -- Thin-films -- Optical fiber sensors -- Band-pass filters -- Fiber DC sputtering; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2017.11.001
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Single-target sputtering nanodeposition of phase-shifted Bragg gratings on fiber. Accurate control of the phase-shift corroborated with theoretical results. Designs with modification of phase-shift and number of periods. Development and characterization of a phase shifted Bragg grating humidity sensor. Abstract: This work describes the process of nanofabrication of phase-shifted Bragg gratings on the end facet of a multimode optical fiber with a pulsed DC sputtering system based on a single target. Several structures have been explored as a function of parameters such as the number of layers or the phase-shift. The experimental results, corroborated with simulations based on plane-wave propagation in a stack of homogeneous layers, indicate that the phase-shift can be controlled with a high degree of accuracy. The device could be used both in communications, as a filter, or in the sensors domain. As an example of application, a humidity sensor with wavelength shifts of 12 nm in the range of 30 to 90% relative humidity (200 pm/% relative humidity) is presented.