Article
Chemistry, Analytical
Pawel Koziol, Piotr Jaworski, Karol Krzempek, Viktoria Hoppe, Grzegorz Dudzik, Fei Yu, Dakun Wu, Meisong Liao, Jonathan Knight, Krzysztof Abramski
Summary: This study demonstrated the fabrication of microchannels in a nodeless antiresonant hollow-core fiber (ARHCF) using femtosecond laser cutting, improving gas flow into the fiber core. Experimental results showed low transmission losses and the flexibility of the process. The maximum bending radius for the ARHCF with the processed microchannel was experimentally determined to be 15 cm without causing breaking.
Article
Engineering, Electrical & Electronic
Jichao Zang, Charu Goel, Muhammad Rosdi Abu Hassan, Wonkeun Chang, Seongwoo Yoo
Summary: The unique characteristics of hollow core fibers make them attractive for designing inline fiber optic devices. We report a novel approach that uses a resonant band of single-ring antiresonant fiber to realize a high-performance hollow-core fiber polarizer. The device offers low transmission loss and a high polarization extinction ratio. These results encourage further development of other hollow-core fiber components.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Di Chen, Shuhui Liu, Zhengqing Shen, Panting Niu, Wei Cheng, Feng Xu
Summary: This article introduces a respiration sensor based on the anti-resonant reflecting effect, which can accurately monitor breath patterns, peak expiratory flow, and temperature changes. The sensor is lightweight, cost effective, and suitable for monitoring patients during certain medical procedures.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
Jisoo Kim, Johannes Buerger, Bumjoon Jang, Matthias Zeisberger, Julian Gargiulo, Leonardo de S. Menezes, Stefan A. Maier, Markus A. Schmidt
Summary: In this study, the properties of the on-chip hollow-core microgap waveguide in the context of optofluidics were investigated. The waveguide allows for intense light-water interaction and has fast response times. Various absorption-related experiments demonstrated the spectroscopic capabilities of the nanoprinted waveguide, and time-resolved experiments showed improved diffusion times due to the lateral access provided by the microgaps. Overall, the microgap waveguide represents a promising pathway for on-chip spectroscopy in aqueous environments.
Article
Optics
Jisoo Kim, Johannes Buerger, Bumjoon Jang, Matthias Zeisberger, Julian Gargiulo, Leonardo de S. Menezes, Stefan A. Maier, Markus A. Schmidt
Summary: In this study, we introduce a novel on-chip hollow-core microgap waveguide using nanoprinting technology, which enables intense light-water interaction over long lengths with fast response times. Spectroscopic capabilities are demonstrated through various absorption-related experiments, showing the applicability of the Beer-Lambert law. Time-resolved experiments also show improved diffusion times due to lateral access provided by the microgaps. Overall, the microgap waveguide represents a pathway for on-chip spectroscopy in aqueous environments.
Article
Optics
Wei Cheng, Shuhui Liu, Shengguo Zhao, Litong LI
Summary: An optofluidic sensor based on a Bragg grating in hollow core fiber (HCF) is demonstrated. The grating is inscribed into the HCF using femtosecond laser illumination, causing cladding mode resonance. The refractive index sensing of high index liquid and temperature sensitivity are achieved with this device.
Article
Optics
Zhipei Li, Ran Gao, Xiangjun Xin, Han Zhang, Huan Chang, Dong Guo, Fu Wang, Sitong Zhou, Chao Yu, Xinyu Liu
Summary: A microfiber optofluidic flowmeter based on the Coriolis principle and a dual-antiresonant reflecting optical waveguide (ARROW) is proposed and experimentally demonstrated. The flow rate can be measured based on the Coriolis force by calculating the phase difference between two ARROWs. The proposed micro Coriolis fiber optic flowmeter can be used in various fields, such as food production, medicine, bioanalysis, etc.
Article
Optics
Charu Goel, Yuxi Wang, Seongwoo Yoo, Wonkeun Chang
Summary: By designing a special structure of hollow-core fiber, we have successfully inscribed a high reflection FBG inside, opening up new possibilities for the development of gas photonics.
Article
Optics
Yunhao Zhu, Ningfang Song, Fuyu Gao, Xiaobin Xu
Summary: The hollow-core antiresonant fiber with nested supporting rings offers advantages of low loss, large bandwidth, simple structure, and good bending characteristics, making it suitable for applications such as data transmission, sensing, and high power delivery.
Article
Optics
Yunhao Zhu, Wei Li, Fuyu Gao, Xiaobin Xu, Ningfang Song
Summary: Hollow-core nested anti-resonant nodeless fibers (HC-NANFs) with a small-core structure and optimized design show low confinement loss, bending loss, and coupling loss. The fiber exhibits a large bandwidth, effective single-mode operation, and potential for high birefringence performance. It is suitable for short-haul applications in laser-based gas sensing, miniaturized fiber sensing, etc.
Article
Engineering, Electrical & Electronic
Charu Goel, Seongwoo Yoo
Summary: A novel centro-symmetric nested antiresonant fiber (CNAF) design is proposed and investigated numerically for low-loss, multimode applications, showing superiority over conventional asymmetric nested tube designs in inhibiting coupling of higher order modes to lossy cladding modes and supporting multiple distinct core mode groups. The designed fiber supports 5 to 9 spatially distinct core mode groups with confinement loss less than 0.002 dB/m to 0.01 dB/m respectively.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Jiajing Tu, Jingbiao Wu, Chuangrong Huang, Jie Zhang, Shecheng Gao, Zhaohui Li, Weiping Liu
Summary: We study the generation process of orbital angular momentum (OAM) mode using a helically twisted hollow-core antiresonant fiber (HC-ARF) based on a long-period onefold chiral fiber grating (L-1-CFG). By using a Gaussian beam, we demonstrate that the first-order OAM+1 mode can be generated in the right-handed L-1-CFG. We fabricate three right-handed L-1-CFG samples with twist rates (alpha) of -0.42, -0.50, and -0.60 rad/mm, achieving high OAM(+1) mode purity of 94% with the twisted HC-ARF of -0.42 rad/mm. Experimental transmission spectra at the C-band show sufficient modulation depths at wavelengths of 1550 nm and 1561.5 nm.
Article
Computer Science, Information Systems
Shuai Yang, Xinzhi Sheng, Guozhong Zhao, Shuqin Lou, Jiaoyan Guo
Summary: An antiresonant hollow core effective single-mode terahertz fiber was proposed and successfully fabricated using a 3D printer with photosensitive resin. By optimizing the cladding structure parameters, a higher order mode extinction ratio (HOMER) of above 6 can be achieved. The experimental results showed that the fiber sample had low transmission loss and a Gaussian profile electric field distribution, meeting the single-mode requirements.
Article
Engineering, Electrical & Electronic
Charu Goel, Jichao Zang, Matyas Parrot, Seongwoo Yoo
Summary: This study presents a compact, temperature-insensitive, multi-axial mechanical force sensor based on a single-core antiresonant hollow-core fiber. By enhancing the interaction between interfering modes in the fiber, a four-fold increase in interference pattern amplitude was achieved, resulting in distinguishable linear responses to external mechanical forces. The sensor shows negligible thermal crosstalk and is inherently insensitive to light polarization, making it suitable for simultaneous sensing of transverse and longitudinal mechanical forces.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Viktor Zuba, Hans Christian H. Mulvad, Radan Slavik, Hesham Sakr, Francesco Poletti, David J. Richardson, Eric Numkam Fokoua
Summary: The fundamental limits on the efficiency of coupling light into hollow-core antiresonant fibres are theoretically explored. It is found that the nested antiresonant nodeless fibre (NANF) has higher coupling efficiency when the incident beam waist is about 70% of the core diameter, and that fibres operating in even-numbered windows achieve higher coupling efficiencies than those operating in odd-numbered windows.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)