Large refractive index modulation based on a BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription

Xuehao Hu; Xiaoyu Yue; Xin Cheng; Shixin Gao; Rui Min; Heng Wang; Hang Qu; Hwayaw Tam

doi:10.1364/OL.427042

Large refractive index modulation based on a BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription

Xuehao Hu, Xiaoyu Yue, Xin Cheng, Shixin Gao, Rui Min, Heng Wang, Hang Qu, Hwayaw Tam

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

15 Citations (Scopus)

Abstract

We experimentally report high reflectivity on the poly(methyl methacrylate) (PMMA)-based polymer optical fiber Bragg gratings by means of a 266 nm pulsed laser and phase mask technique. In the first recipe, fiber Bragg gratings (FBGs) were manufactured with a single pulse up to 3.7 mJ. After post-annealing, a stable refractive index change up to 4.2 × 10 ⁻⁴ was obtained. In the second recipe, FBGs were inscribed by 22 pulses with a lower pulse energy of 1.4 mJ, showing a stable refractive index change of 6.2 × 10 ⁻⁴. Both behaviors may mainly be attributed to the movement of initiating radicals arising from benzyl dimethyl ketal (BDK) under UV irradiation. The high refractive index change in step-index fibers paves the way to tilted FBG manufacturing with large tilt angles potentially for biomedical applications.

Original language	English
Pages (from-to)	2864-2867
Number of pages	4
Journal	Optics Letters
Volume	46
Issue number	12
DOIs	https://doi.org/10.1364/OL.427042
Publication status	Published - 15 Jun 2021

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OL.427042

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title = "Large refractive index modulation based on a BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription",

abstract = "We experimentally report high reflectivity on the poly(methyl methacrylate) (PMMA)-based polymer optical fiber Bragg gratings by means of a 266 nm pulsed laser and phase mask technique. In the first recipe, fiber Bragg gratings (FBGs) were manufactured with a single pulse up to 3.7 mJ. After post-annealing, a stable refractive index change up to 4.2 × 10 −4 was obtained. In the second recipe, FBGs were inscribed by 22 pulses with a lower pulse energy of 1.4 mJ, showing a stable refractive index change of 6.2 × 10 −4. Both behaviors may mainly be attributed to the movement of initiating radicals arising from benzyl dimethyl ketal (BDK) under UV irradiation. The high refractive index change in step-index fibers paves the way to tilted FBG manufacturing with large tilt angles potentially for biomedical applications. ",

author = "Xuehao Hu and Xiaoyu Yue and Xin Cheng and Shixin Gao and Rui Min and Heng Wang and Hang Qu and Hwayaw Tam",

note = "Funding Information: Funding. Special projects in key fields of colleges and universities in Guangdong Province (2020ZDZX3035, 2020ZDZX3037); Specialized Project Fund in Science and Technology of Guangdong Province (190827105545434, 190827105565385); The Optics and Photoelectronics Project (2018KCXTD011); The Start-up fund from Shantou University (NTF18016, NTF19023); National Natural Science Foundation of China (62003046); International Science and Technology Cooperation Program of Jiangsu Province (BZ2019063, BZ2020030, BZ2020045). Publisher Copyright: {\textcopyright} 2021 Optical Society of America",

year = "2021",

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day = "15",

doi = "10.1364/OL.427042",

language = "English",

volume = "46",

pages = "2864--2867",

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T1 - Large refractive index modulation based on a BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription

AU - Hu, Xuehao

AU - Yue, Xiaoyu

AU - Cheng, Xin

AU - Gao, Shixin

AU - Min, Rui

AU - Wang, Heng

AU - Qu, Hang

AU - Tam, Hwayaw

N1 - Funding Information: Funding. Special projects in key fields of colleges and universities in Guangdong Province (2020ZDZX3035, 2020ZDZX3037); Specialized Project Fund in Science and Technology of Guangdong Province (190827105545434, 190827105565385); The Optics and Photoelectronics Project (2018KCXTD011); The Start-up fund from Shantou University (NTF18016, NTF19023); National Natural Science Foundation of China (62003046); International Science and Technology Cooperation Program of Jiangsu Province (BZ2019063, BZ2020030, BZ2020045). Publisher Copyright: © 2021 Optical Society of America

PY - 2021/6/15

Y1 - 2021/6/15

N2 - We experimentally report high reflectivity on the poly(methyl methacrylate) (PMMA)-based polymer optical fiber Bragg gratings by means of a 266 nm pulsed laser and phase mask technique. In the first recipe, fiber Bragg gratings (FBGs) were manufactured with a single pulse up to 3.7 mJ. After post-annealing, a stable refractive index change up to 4.2 × 10 −4 was obtained. In the second recipe, FBGs were inscribed by 22 pulses with a lower pulse energy of 1.4 mJ, showing a stable refractive index change of 6.2 × 10 −4. Both behaviors may mainly be attributed to the movement of initiating radicals arising from benzyl dimethyl ketal (BDK) under UV irradiation. The high refractive index change in step-index fibers paves the way to tilted FBG manufacturing with large tilt angles potentially for biomedical applications.

AB - We experimentally report high reflectivity on the poly(methyl methacrylate) (PMMA)-based polymer optical fiber Bragg gratings by means of a 266 nm pulsed laser and phase mask technique. In the first recipe, fiber Bragg gratings (FBGs) were manufactured with a single pulse up to 3.7 mJ. After post-annealing, a stable refractive index change up to 4.2 × 10 −4 was obtained. In the second recipe, FBGs were inscribed by 22 pulses with a lower pulse energy of 1.4 mJ, showing a stable refractive index change of 6.2 × 10 −4. Both behaviors may mainly be attributed to the movement of initiating radicals arising from benzyl dimethyl ketal (BDK) under UV irradiation. The high refractive index change in step-index fibers paves the way to tilted FBG manufacturing with large tilt angles potentially for biomedical applications.

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U2 - 10.1364/OL.427042

DO - 10.1364/OL.427042

M3 - Journal article

SN - 0146-9592

VL - 46

SP - 2864

EP - 2867

JO - Optics Letters

JF - Optics Letters

IS - 12

ER -

Large refractive index modulation based on a BDK-doped step-index PMMA optical fiber for highly reflective Bragg grating inscription

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