We investigate nanoscale optical phenomena with an emphasis on the underlying physics of light–matter interactions under extreme spatial and temporal confinement. Under such conditions, the intricate interactions and couplings among photons, electrons, and phonons in nanostructures and molecular systems can give rise to emergent behaviors and previously inaccessible regimes of interaction. Leveraging these insights, we advance high‑sensitivity, high‑resolution spectroscopies and develop spectroscopic instruments to enable in situ, time‑resolved, multi‑scale and multi‑dimensional characterization of complex interfacial dynamics.

•  Nanoscale photonics

    We design and engineer tailored nanostructures and optical cavities that exploit unique electromagnetic coupling to enable efficient light generation, manipulation, conversion, and detection. For example, we convert incoherent illumination into coherent light sources, engineer light propagation and localization, and realize frequency up‑conversion from low‑energy to high‑energy photons, thereby enhancing the detection sensitivity for targeted signals.

• Spectroscopy instrumentation

    Based on understanding of nanoscale photonics, we develop high‑sensitivity, high‑resolution spectroscopic instrumentation and methodologies. For example, by leveraging optical up‑conversion mechanisms, we construct highly sensitive, complementary vibrational spectroscopic instruments. In parallel, we implement automated instrument control and integrate AI‑enabled spectral analysis and decision‑making feedback, thereby establishing an intelligent, closed‑loop, multi‑spectral research system.

•  Interfacial mechanism

    We apply these advanced spectroscopic instruments and methodologies to complex interfaces, where high‑throughput, automated, multi‑spectral measurements enable in‑depth exploration of the mechanisms governing interfacial processes.