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.

中文翻译：

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全介电光子晶体中两个导模共振的相互作用，以实现均匀的SERS

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的响应并增强信号增强能力的基板。为此，我们提出了一种光子晶体（PC）结构，由于其高品质因数谐振，该结构能够支持大场增强。此外，我们证明了这种全电介质PC的两种模式的相互作用可以在PC的整个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。设计的结构可以支持70％和97％的均匀性的最大场增强。