Professor W Jin and his research team has worked on the “gas sensing research” which is honoured as “2020 China’s Top Ten Optical Breakthroughs” by China Laser Press. In the applied research category, Professor Jin Wei, Chair Professor of Photonic Instrumentation, and his team developed a novel method of gas sensing called the Mode-phase-difference Photothermal Spectroscopy. The method was hailed as “a landmark technique in fibre-optic gas sensing” by a reviewer in Nature Communications, where the research results were published. The innovation significantly outperforms state-of-the-art electrochemical and semiconductor gas sensors, and enables multi-component gas detection with a single sensing element. It paves the way for ultra-precision gas sensing for applications such as harmful gas detection in a space station and high voltage transformer condition monitoring.