Bragg grating inscription in PMMA optical fibers using 400-nm femtosecond pulses

Hu, Xuehao; Kinet, Damien; Chah, Karima; Pun, Chi Fung Jeff; Tam, Hwa Yaw; Caucheteur, Christophe

doi:10.1364/ol.42.002794

Cited by 14 publications

(16 citation statements)

References 32 publications

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“…1. Our sensor is inscribed in step index PMMA created by the Hong Kong Polytechnic University with a core diameter of 8.2μm and a cladding diameter of 150μm [9,10]. The core and cladding are pure PMMA, with the core doped with diphenyl sulfide (5 % mole) and trans-4-stilbenemethanol (1 % w.t.).…”

Section: Methodology and Experimental Setupmentioning

confidence: 99%

An L-band ultrasonic probe using polymer optical fibre

Broadway

Woyessa

Bang

et al. 2019

Photons Plus Ultrasound: Imaging and Sensing 2019

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In recent years, Polymer optical fibre (POF) has been receiving increasing attention for sensing applications. For applications such as endoscopic ultrasound and photo-acoustics, PMMA polymer fibres deliver ever improving performance and more types of polymer are being trialled for these applications. The fundamental properties of POF, when correctly leveraged, deliver at least an order of magnitude in improvements over silica fibres. POF delivers lower acoustic impedance, a reduced Young's Modulus and a higher acoustic sensitivity within the megahertz region. In contrast, existing piezo-electric transducers have an inherent narrow acoustic bandwidth and a proportionality to size that causes difficulties for applications such as endoscopy within the biomedical domain. With the increasing take-up of POF, improvements have been made in fibre dopant distribution, the range of polymers available and connectorisation techniques. While newer polymer fibres are under preliminary study, PMMA has shown itself to be the most sensitive fibre to date despite historically higher levels of dopant inconsistency and an implementation around 830 nm that has a lower signal-to-noise ratio than possible. The prior approach of edge filtering a Bragg grating with a high speed photodiode has been shown to function and is therefore maintained. We present a step index PMMA Bragg grating ultrasonic probe in the L-band for the first time. Detection is achieved using a Bragg grating less than 1cm in length in a fibre under 10cm long. We examine the temporal and frequency response of the sensor over a 1-15 MHz range.

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Section: Methodology and Experimental Setupmentioning

confidence: 99%

An L-band ultrasonic probe using polymer optical fibre

Broadway

Woyessa

Bang

et al. 2019

Photons Plus Ultrasound: Imaging and Sensing 2019

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“…Figure 3a shows the photochemical transformation process of 4-stilbenemethanol from trans to cis structure under UV illumination [27,48], and the trans-isomer has a higher refractive index compared to cis-isomer due to the change in molecular polarity [46]. Under certain circumstances, trans-cis photoisomerization continues after UV irradiation [49], or a reverse process (cis-trans photoisomerization) occurs [29,49]. These effects could be attributed to the equilibrium between both intermediate states 𝑇 in the scheme of energy levels involved in the photoisomerization process [50], as displayed in Figure 3b.…”

Section: Tsmentioning

confidence: 99%

Recent Achievements on Grating Fabrications in Polymer Optical Fibers with Photosensitive Dopants: A Review

et al. 2022

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This review discusses recent achievements on grating fabrications in polymer optical fibers doped with photosensitive materials. First, different photosensitive dopants in polymer optical fibers (POFs) are summarized, and their refractive index change mechanisms are discussed. Then, several different doping methods to fabricate the photosensitive POFs are presented. Following that, the principles of gratings, including standard fiber Bragg gratings (FBGs), tilted fiber Bragg gratings (TFBGs), chirped fiber Bragg gratings (CFBGs), phase-shifted fiber Bragg gratings (PSFBGs), and long period fiber gratings (LPFGs), are reported. Finally, fabrications of different gratings based on photosensitive POFs in the last 20 years are reported. We present our article clearly and logically, so that it will be helpful for researchers to explore a broad perspective on this proposed topic. Overall, the content provides a comprehensive overview of photosensitive POF fabrications and grating inscriptions in photosensitive POFs, including previous breakthroughs and recent advancements.

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“…The fabrication process of POF grating devices has been reported by using different kind of lasers system such as 800 nm Ti:sapphire femto-second laser system [38], 532 nm Nd:YVO4 laser system [35], 387 nm Ti:sapphire femto-second laser system [39], 355 nm Nd:YAG laser system [40], 325 nm He-Cd laser [41], 266 nm Nd-YAG laser system [42] and 248 nm KrF excimer laser system [43]. Although 325 nm was the first irradiation wavelength for POF reported by the researchers in The University of New South Wales [44] and initially 248 nm and 266 nm wavelength were not considered suitable for POF grating writing due to high absorption of POF material at such wavelength, the first POF Bragg grating devices successful inscription less than one minutes with low flow and repetition rate 248 nm UV pulse opened a novel field of interest for POF grating irradiation [43].…”

Section: Fabrication Of Pof Grating Devicesmentioning

confidence: 99%

Fabrication and Application of Polymer Optical Fiber Grating Devices

Min¹

2021

Application of Optical Fiber in Engineering

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Grating devices in polymer optical fiber (POFs) have attracted interest due to varies potential applications in recent years. This chapter presents the state of art about the fabrication technology of grating devices in different kinds of POFs and explores potential sensing application scenarios, focus on the fabrication of chirped POF FBG devices and the potential application of such devices. Present several typical applications with uniform POF FBG. Also present several typical applications based on Chirped POF FBG, which indicate POF FBG shown promising in the sensing area with show higher sensitivity and bio-compatibility than silica ones, and special grating in POF are attractive for future biomedical applications.

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Bragg grating inscription in PMMA optical fibers using 400-nm femtosecond pulses

Cited by 14 publications

References 32 publications

An L-band ultrasonic probe using polymer optical fibre

An L-band ultrasonic probe using polymer optical fibre

Recent Achievements on Grating Fabrications in Polymer Optical Fibers with Photosensitive Dopants: A Review

Fabrication and Application of Polymer Optical Fiber Grating Devices

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