title: Metallo-dielectric photonic crystals for surface-enhanced Raman scattering.
abstract: Metallo-dielectric photonic crystals (MDPCs) are used as ultrasensitive molecular detectors for concentrations down to picomolar level based on surface-enhanced Raman spectroscopy (SERS). Calculations show that the amorphous silicon photonic crystals (a-Si PCs) embedded in multiple metallo-dielectric (MD) units can significantly increase the electromagnetic fields at the air-dielectric interface, leading to remarkable Raman enhancement. Corresponding experiments show the multiple MDPC structures can serve as an ultrasensitive SERS substrate with excellent reproducibility and stability, capable of quantitative analysis down to 10 pM level. The MDPC structure can be generalized to other applications, such as plasmonic devices, ultrasensitive sensors, and nanophotonic systems.
authors: Center of Super-Diamond and Advanced Films and Department of Physics and Materials Science, City University of Hong Kong , Hong Kong SAR, China.
authors: Yu
authors: Y
authors: Zhao
authors: Xue-Jin
authors: XJ
authors: Zhang
authors: Jing
authors: J
authors: Ye
authors: Li-Miao
authors: LM
authors: Chen
authors: Shu-Ping
authors: SP
authors: Lau
authors: Wen-Jun
authors: WJ
authors: Zhang
authors: Shuit-Tong
authors: ST
authors: Lee