Sabri Laaya, Shahabadi Mahmoud, Forooraghi Keyvan, Ghaffari-Miab Mohsen
Opt Express. 2020 Mar 30;28(7):10467-10476. doi: 10.1364/OE.389524.
For sensing and imaging applications of surface-enhanced Raman scattering (SERS), one needs a substrate with the capability of generating a consistent and uniform response and increased signal enhancement. To this goal, we propose a photonic-crystal (PC) structure capable of supporting large field enhancement due to its high quality-factor resonance. Moreover, we demonstrate that the interaction of two modes of this all-dielectric PC can provide an almost uniform field enhancement across the unit cell of the PC. This is of practical importance for SERS applications. The designed structure can support a maximum field enhancement of 70 and 97 percent of uniformity.
对于表面增强拉曼散射（SERS）的传感和成像应用，需要一种能够产生一致且均匀响应并增强信号增强能力的基底。为了实现这一目标，我们提出了一种光子晶体（PC）结构，由于其高品质因子共振，该结构能够支持大的场增强。此外，我们证明了这种全介质PC的两种模式的相互作用可以在PC的晶胞上提供几乎均匀的场增强。这对于SERS应用具有实际重要性。所设计的结构可以支持最大场增强为70，均匀性为97%。
