Khan Muhammad Umar, Corbett Brian
Tyndall National Institute, University College Cork , Cork , Ireland.
Sci Technol Adv Mater. 2016 Jul 29;17(1):398-409. doi: 10.1080/14686996.2016.1202082. eCollection 2016.
Resonant propagating waves created on the surface of a dielectric multilayer stack, called Bloch surface waves (BSW), can be designed for high sensitivity monitoring of the adjacent refractive index as an alternative platform to the metal-based surface plasmon resonance (SPR) sensing. The resonant wavelength and polarization can be designed by engineering of the dielectric layers unlike the fixed resonance of SPR, while the wide bandwidth low loss of dielectrics permits sharper resonances, longer propagation lengths and thus their use in waveguiding devices. The transparency of the dielectrics allows the excitation and monitoring of surface-bound fluorescent molecules. We review the recent developments in this technology. We show the advantages that can be obtained by using high index contrast layered structures. Operating at 1550 nm wavelengths will allow the BSW sensors to be implemented in the silicon photonics platform where active waveguiding can be used in the realization of compact planar integrated circuits for multi-parameter sensing.
在介电多层堆叠表面产生的共振传播波,称为布洛赫表面波(BSW),可被设计用于高灵敏度监测相邻折射率,作为基于金属的表面等离子体共振(SPR)传感的替代平台。与SPR的固定共振不同,共振波长和偏振可通过介电层的工程设计来实现,而介电材料的宽带宽低损耗允许产生更尖锐的共振、更长的传播长度,因此可用于波导器件。介电材料的透明性允许激发和监测表面结合的荧光分子。我们回顾了该技术的最新进展。我们展示了使用高折射率对比度分层结构可获得的优势。在1550纳米波长下工作将使BSW传感器能够在硅光子学平台中实现,在该平台中,有源波导可用于实现用于多参数传感的紧凑型平面集成电路。