2011年11月9日加拿大国家科学院的许丹霞博士来访华师光及电磁波研究中心，并做了题为《Silicon photonic wire and subwavelength devices for biosensing and communications》的报告。
Silicon photonic waveguides can be scaled down to submicron dimensions owing to its high refractive index contrast. This scaling allows the interaction between light and matter being manipulated at the wavelength scale. This behavior can be used for optical sensing applications, and silicon photonic wire sensors are the smallest and most sensitive label-free integrated molecular sensors reported. They are a serious contender for lab-on-a-chip technology by allowing real-time monitoring of a large number of sensors for pathogen detection, genomics, disease diagnostics and drug discovery. Optimized waveguide structures for sensing fall in the same dimensional range as that in components for optical interconnects and communications applications. Therefore the same high quality material supply, knowledge in photonic design, well-established CMOS fabrication technologies and facilities can be shared for all these applications. Here we review our work on the development of Si photonic wire components, including specific examples of components that are tailored as evanescent field biosensor arrays and ring resonator based filters for communications. Monitoring of biomolecular binding is demonstrated with a detection limit of 0.3 pg/mm2. On-chip temperature drift compensation is achieved by using a reference resonator. A novel grating coupler using subwavelength structures facilitates the coupling of light between the optical fiber and waveguide chips.