Hanyu Liao

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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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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Highly Sensitive Chalcogenide Glass Waveguide Photothermal Spectroscopy Sensor Chip

Qingyang Du, Kaiyuan Zheng, Fengbo Han, Hanyu Liao et autres

Photothermal spectroscopy (PTS) sensors have attracted increasing attention owing to its outstanding sensitivity and specificity for chemical detection. In this work, we designed and fabricated suspended chalcogenide glass waveguide for PTS sensing. The sensor is fiber-packaged, which achieved a remarkably detection limit …

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Hollow-core fiber-based photothermal spectroscopy for hydrogen detection

Shoulin Jiang, Shuangxiang Zhao, Hanyu Liao, Yuncai Wang et autres

We present an optical hydrogen sensor based on photothermal spectroscopy with a hollow-core fiber, specifically targeting the 2121.8-nm quadrupole absorption line of hydrogen. Our experiments demonstrate the sensor's capability for detecting hydrogen gas at concentrations as low as 77 ppm, with a …

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Hydrogen sensor based on hollow-core fiber photothermal spectroscopy

Shiyu Zhang, Shoulin Jiang, Shuangxiang Zhao, Hanyu Liao et autres

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 …

Stimulated Raman photothermal spectroscopy for gas sensing in a hollow-core optical fiber

Hanyu Liao, Kaiyuan Zheng, Haihong Bao, Shoulin Jiang et autres

Raman spectroscopy is an essential optical tool for tracing gases that exhibit weak or no infrared absorption. Existing Raman spectroscopic methods are deficient for precision sensing applications due to the extremely low Raman cross-section of gas. Herein, we report an approach, named …

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Photothermal phase modulation in a gas-immersed optical nanofiber

Hanyu Liao, Yun Qi, Hoi Lut Ho, Haihong Bao et autres

We report the observation and theoretical analysis of photothermal phase modulation in an optical nanofiber (NF) immersed in light-absorbing gas. The phase modulation arises from the contrasting photothermal processes experienced by the mode field within and outside the NF, which exhibits significant …

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Hollow-Core Fiber-Based Mid-Infrared Photothermal Spectroscopy for Multi-Component Gas Sensing

Kaiyuan Zheng, Haihong Bao, Wenxuan Luo, Fei Liu et autres

We report a mid-infrared (MIR) photothermal laser spectroscopy system for multi-component gas sensing with a single broadband anti-resonant hollow-core fiber gas cell. Three MIR pump lasers are used as the excitation sources to generate photothermal phase modulation and a near-infrared probe laser …

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Heterodyne Raman dispersion spectroscopy with harmonic demodulation for hydrogen detection

Hanyu Liao, Yun Qi, Shoulin Jiang, Hoi Lut Ho et autres

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Photothermally Induced Birefringence in an Optical Nanofiber for All‐Optical Polarization Manipulation

Yun Qi, Hanyu Liao, Hoi Lut Ho, Wei Jin

Abstract This study reports the experimental observation of photothermally induced birefringence (PIB) in an optical nanofiber (NF). The PIB originates from the interaction between the azimuthally asymmetric evanescent field of a guided pump beam in mode and the gas molecules surrounding the …

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