Dr. Zheng's research interests cover the exploration of light-gas interactions within optical cavities, fibers, and waveguide chips, with the aim of developing advanced laser spectroscopic techniques for ultra-sensitive and selective gas sensing. Besides the technology innovation, his research also aims to developing sensing applications in air pollutant monitoring and leakage identification, to understand the physical and chemical processes of air pollution in complex urban and field environments.

Research Themes under ENVR

• Air and Health

Research Areas

• Air quality and environmental health
• Optical gas sensor technology
• Sensor and sensor network application

Research Interests

• Air quality management
• Environmental technologies
• Lab on a chip
• Infrared laser spectroscopy
• Optical sensors for light-matter interactions

Research Projects 

• ECF: Environment and Conservation Fund−Development of an ultra-portable methane monitoring system and its mobile application for ground-based measurement to identify hotspots from mobile emission sources in Hong Kong.

Publications

Representative Publications

• K. Zheng, Z. Peng, H. Liao, Y. Huang, H. Bao, S. Zhao, Y. Zhang, C. Zheng, Y. Wang, W. Jin, Dual slow-light enhanced photothermal gas spectroscopy on a silicon chip, Nature Communications, 2025. https://doi.org/10.1038/s41467-025-65583-5.
• K. Zheng, H. Liao, F. Han, X. Wang, Y. Zhang, J. Gu, P. Zhao, H. Bao, S. Yu, Q. Du, L. Liang, C. Zheng, W. Jin, L. Wang, Suspended waveguide-enhanced near-infrared photothermal spectroscopy for ppb-level molecular gas sensing on a chalcogenide chip, Light Science & Applications, 2025.
• K. Zheng, M. Pi, Y. Huang, Z. Peng, H. Zhao, F. Song, H. Bao, S. Jiang, H. Ho, C. Zheng, W. Jin, Y. Wang, Waveguide-based on-chip photothermal spectroscopy for gas sensing, Laser & Photonics Reviews, 2024, 2301071.
• Z. Peng, Y. Min, M. Pi, K. Zheng,* F. Song, L. Liang, Y. Wang, Y. Zhang, X. Bai, C. Zheng, On-chip near-infrared gas sensing based on slow light mode multiplexing in photonic crystal waveguides, Lab on a Chip, 2025, 25, 5318.
• K. Zheng, S. Jiang, F. Chen, Y. Zhao, S. Gao, Y. Wang, H. Ho, W. Jin, Mid-infrared all-optical modulators based on an acetylene-filled hollow-core fiber, Light: Advanced Manufacturing, 2022, 3, 712.
• H. Liao, Y. Zhao, K. Zheng, H. Bao, S. Jiang, H. Ho, S. Gao, Y. Wang, W. Jin, Stimulated Raman photothermal spectroscopy for gas sensing in a hollow-core optical fiber, Optica, 2024, 11, 1682.
• K. Zheng, W. Luo, L. Duan, S. Zhao, S. Jiang, H. Bao, H. Ho, C. Zheng, Y. Zhang, W. Ye, W. Jin, High sensitivity and stability cavity-enhanced photoacoustic spectroscopy with dual-locking scheme, Sensors and Actuators B: Chemical, 2024, 415, 135984.
• K. Zheng, L. Yu, C. Zheng, Z. Xi, Y. Zhang, G. Yan, H. Zhang, Y. Zhang, Y. Wang, F. K Tittel, Vehicle-deployed off-axis integrated cavity output spectroscopic CH4/C2H6 sensor system for mobile inspection of natural gas leakage, ACS Sensors, 2022, 7, 1685.
• K. Zheng, C. Zheng, J. Li, N. Ma, Z. Liu, Y. Zhang, Y. Wang, F. K. Tittel, Near-infrared methane sensor system using off-axis integrated cavity output spectroscopy with novel dual-input dual-output coupling scheme for mode noise suppression, Sensors and Actuators B: Chemical, 2020, 308, 127674.
• K. Zheng, C. Zheng, N. Ma, Z. Liu, Y. Yang, Y. Zhang, Y. Wang, F. K. Tittel, Near-infrared broadband cavity-enhanced spectroscopic multigas sensor using a 1650 nm light emitting diode, ACS Sensors, 2019, 4, 1899.

Full Publication List