Haihong Bao

Suspended waveguide-enhanced near-infrared photothermal spectroscopy for ppb-level molecular gas sensing on a chalcogenide chip

Kaiyuan Zheng, Hanyu Liao, Fengbo Han, Xueying Wang et autres

Abstract On-chip waveguide sensors have attracted significant attention recently due to their potential for high-level integration. However, so far, on-chip gas sensing based on traditional laser absorption spectroscopy has demonstrated low detection sensitivity, due to weak light-gas interaction over a limited interaction …

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Ultrasensitive Gas Detection via Polarization-Mode Photothermal Interferometry in a Single-Mode Nanofiber Coupler

Pengcheng Zhao, Haihong Bao, Hoi Lut Ho, Shuangxiang Zhao et autres

Optical nanofibers (ONF) have emerged as versatile platforms for studying light-gas interactions at the micro/nanoscale, yet existing ONF gas sensors remain limited in detection sensitivity. Here, we report a polarization-mode photothermal interferometry technique that precisely measures the gas absorption-induced phase difference between …

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Suspended waveguide-enhanced near-infrared photothermal spectroscopy for ppb-level molecular gas sensing on a chalcogenide chip

Kaiyuan Zheng, Hanyu Liao, Fengbo Han, Xueying Wang et autres

On-chip waveguide sensors have attracted significant attention recently due to their potential for high level integration. However, so far on-chip gas sensing based on traditional laser absorption spectroscopy has demonstrated low detection sensitivity, due to weak light-gas interaction over a limited interaction …

Dual slow-light enhanced photothermal gas spectroscopy on a silicon chip

Kaiyuan Zheng, Hanyu Liao, Yijun Huang, Haihong Bao et autres

Integrated photonic sensors have attracted significant attention recently for their potential for high-density integration. However, they face challenges in sensing gases with high sensitivity due to weak light-gas interaction. Slow light, which dramatically intensifies light-matter interaction through spatial compression of optical energy, …

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Interfacial engineering of Zn2SnO4/MXene heterojunctions enables ultraefficient electrosynthesis of H2O2 via 2e-WOR

Jiangtao Wei, Yaqian Zhang, Jiayu Zheng, Qinglan Hao et autres

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Hollow-Core Fiber Fabry–Pérot Photothermal Gas Sensor: Temperature-Dependent Behavior

Jingwen Wu, Pengcheng Zhao, Haihong Bao, Wei Jin

Photothermal spectroscopy is a promising gas detection technique, providing high selectivity, high sensitivity, and wide dynamic range. Here, we systematically investigate the temperature-dependent behavior of the photothermal signal in a compact hollow-core fiber gas sensor in a Fabry–Pérot cavity configuration. Temperature affects …

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Hollow-core fiber Fabry-Pérot photothermal gas sensing characteristics over the temperature range of 256–354K

Jianhui Wu, Pengcheng Zhao, Haihong Bao, S. L. Ho et autres

We study the temperature dependance of photothermal signal in a hollow-core fiber (HCF) Fabry-Perot photothermal gas sensor. The photothermal signal generally increases with decreasing temperature, due to the temperature dependent absorption and thermal properties of the gas sample in the hollow-core. The …

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Fiber-enhanced Fourier-transform photothermal spectroscopy for multi-component gas sensing

Linhao Guo, Pengcheng Zhao, Haihong Bao, Jingwen Wu et autres

We present Fourier transform photothermal spectroscopy (FT-PTS) with a hollow-core fiber (HCF) absorption cell for gas sensing. A broadband pump beam, covering the absorption lines of target gas species, passes through a scanning two-beam interferometer, which modulates the light intensity at different …

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Hollow-core-fiber-cavity-enhanced stimulated Raman gain spectroscopy for trace hydrogen detection

Feifan Chen, Haihong Bao, Shoulin Jiang, Shoufei Gao et autres

We demonstrate a hydrogen sensor based on hollow-core fiber cavity-enhanced stimulated Raman gain spectroscopy. Using an 8-cm-long hollow-core fiber cavity with finesse of ~ 300, hydrogen detection with a limit of detection of 62 ppm is achieved with 1 s lock-in time …

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Stimulated Raman photothermal spectroscopy on an optical nanofiber for hydrogen detection

Hanyu Liao, Shuangxiang Zhao, Hoi Lut Ho, Haihong Bao et autres

We report stimulated Raman photothermal spectroscopy (SRPTS) on an optical nanofiber (NF) for tracing hydrogen. With an NF of ~50 mm in length and ~700 nm in diameter, we have demonstrated hydrogen detection down to 274 ppm under 1 bar with 350 …

Cs 2 CO 3 ‐ N , N ‐Dimethylacetamide‐Promoted Esterification of Arylformic Acids with a ‐Bromo Esters via Nucleophilic Substitution

Mingxin Li, Haihong Bao, Han Wang, Yu Tian et autres

Herein, a nucleophilic substitution reaction between arylformic acids and α ‐bromo esters, facilitated by a Cs 2 CO 3 ‐DMA system, is reported. This reaction occurs under mild conditions, yielding a diverse range of valuable lactic acid derivatives (34 examples) with good …

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Operando monitoring of gassing dynamics in lithium-ion batteries with optical fiber photothermal spectroscopy

Tianye Zheng, Haihong Bao, Feifan Chen, Jingwen Wu et autres

Gaseous molecules are an inherent byproduct of (electro-)chemical reactions in lithium-ion battery cells during both formation cycles and long-term operation. While monitoring gas evolution can help understand battery chemistry and predict battery performance, the complex nature of gas dynamics makes conventional mass …

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