Abstract
Abstract The advent of resonant dielectric nanomaterials has provided a new path for concentrating and manipulating light on the nanoscale. Such high-refractive-index materials support a diverse set of low-loss optical resonances, including Mie resonances, anapole states, and bound states in the continuum. Through these resonances, high-refractive-index materials can be used to engineer the optical near field, both inside and outside the nanostructures, which opens up new opportunities for Raman spectroscopy. In this review, we discuss the impact of high-refractive-index nano-optics on Raman spectroscopy. In particular, we consider the intrinsic Raman enhancement produced by different dielectric resonances and their theoretical description. Using the optical reciprocity theorem, we derive an expression which links the Raman enhancement to the enhancement of the stored electric energy. We also address recent results on surface-enhanced Raman spectroscopy based on high-refractive-index dielectric materials along with applications in stimulated Raman scattering and nanothermometry. Finally, we discuss the potential of Raman spectroscopy as a tool for detecting the optical near-fields produced by dielectric resonances, complementing reflection and transmission measurements.
Highlights
Optical nanomaterials with a high refractive index are receiving high and increasing attention due to their abilityThe common denominator for resonant high-refractiveindex nanostructures is that they provide strong light confinement with an accompanying enhancement of the electromagnetic near-fields
We address recent results on surface-enhanced Raman spectroscopy based on high-refractive-index dielectric materials along with applications in stimulated Raman scattering and nanothermometry
As we show polarized Raman spectroscopy of dielectric nanostructures provides information on the stored electric energy, which is strongly related to linear and nonlinear light–matter interactions
Summary
The common denominator for resonant high-refractiveindex nanostructures is that they provide strong light confinement with an accompanying enhancement of the electromagnetic near-fields. This opens up new possibilities for controlling and enhancing Raman scattering, since the Raman intensity scales dramatically with the electric nearfield intensity. The optical resonances may be designed to enhance the near-field outside the nanostructure for molecular Raman sensing, such as in surface-enhanced Raman spectroscopy. These applications highlight the importance of Raman spectroscopy as well as.
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