Han Cheng Seat
Brief Introduction
I lead the optical fiber sensing activities at LAAS-CNRS and am responsible for fiber sensor development. I also co-lead the integrated photonics for sensing theme with Dr O. Bernal.
I am developing fiber interferometric sensors for applications ranging from precision metrology, geophysics instrumentation and geotechnics for hazard mitigation, to biomedical engineering (simultaneous pulse pressure and heart rate measurements). These sensors are based on the versatile extrinsic fiber Fabry-Perot interferometer (EFFPI) to measure displacements or any relative movements. Another EFFPI variant for distance measurement is currently under validation to enhance our capability for absolute metrology.
Another part of my research is oriented towards fiber refractometric sensor development for refractive index measurement and the detection of gases emitted in aquatic environments. We are exploring different optical fiber technologies, such as multimode fibres (MMFs), photonic crystal fibers (PCFs), and other microstructured optical fibers (MOFibers). One of our principal interests is detecting dissolved methane (CH4), considered both a greenhouse gas (GHG) and a potential "sustainable" energy source, in the context of global warming and energy sustainability. Gas selectivity is achieved by functionalizing the fiber sensor probes CH4 (or other GHGs).
Since end-2018, I also co-initiated a new research axis in photonic integrated circuits (PICs), as a sensing platform to develop high sensitivity micro-nano sensors incorporating bespoke features (e.g. geometry long period gratings, rib waveguides, ring resonators, interferometers, etc. One primary focus is on designing PIC sensors (integrated SPR sensors & spectrometers) for the detection of CO2, CH4, and biomolecules (e.g. protein RNAs) that can potentially impact on the environment (global warming) and population health. We are also researching on enabling optical function integration in PIC-based technological platforms (cf recent PhD research) for direct on-chip optical processing.
More information on my research can be found below:
- Fiber optic interferometric sensors
- Fiber refractometers
- PIC for sensing
