Raman scattering enhancement in photon-plasmon resonance mediated metal-dielectric microcavity

Abstract

Here, we report the photon-plasmon interaction scheme and enhanced field strengths resulted into the amplification of phonon in a novel microcavity. A metal-dielectric microcavity, with unified cavity photonic mode and localized surface plasmon resonances, is visualized by impregnating the gold nanoparticles into the deep see-through nano-sized pores of porous silicon microcavity. The intense optical field strengths resulting from the photon-plasmon interactions are probed by both resonant and non-resonant Raman scattering experiments. Due to photon-plasmon-phonon interaction mechanism, several orders of enhancement in the intensity of scattered Raman Stokes photon (at 500 cm−1) are observed. Our metal nanoparticle-microcavity hybrid system shows the potential to improve the sensing figure of merit as well as the applications of plasmonics for optoelectronics, photovoltaics, and related technologies.

Microcavity enhancement of low‐frequency Raman scattering from a CsPbI3 thin film

“…Inside the microcavity, three layers were placed: a TiO 2 layer deposited by spray pyrolysis of variable thickness, a spin‐coated CsPbI 3 layer, and a top spacer of spin‐coated N , N ′‐bis(3‐methylphenyl)‐ N , N ′‐diphenylbenzidine (TPD). The “optical thickness” of the total spacer layer was calculated by the following equation: . The Indices 1–3 refer to TiO 2 , CsPbI 3 , and TPD layers, respectively, as shown in Figure a.…”

Resonant enhancement of Raman scattering in metamaterials with hybrid electromagnetic and plasmonic resonances

“…Surface enhanced Raman scattering (SERS) has been widely reported from resonant plasmonic nanostructured materials due to localized and enhanced near-fields [19][20][21][22][23]. SERS enhancement factors of greater than 10 6 were obtained in these plasmoic structures with optimized structural parameters.…”

Nanostructure-free Metal–Dielectric Stacks for Raman Scattering Enhancement and Defect Identification in CVD-Grown Tungsten Disulfide (2H-WS2) Nanosheets

“…In the context of amplification of spontaneous emission and Raman scattering, metal–dielectric photonic crystal structures are studied as they are composite structures, consisting of both photonic modes and plasmonic resonances. − Previous studies on multilayer dielectric stacks in the optical notch filter design are helpful for a comprehensive incident angular range . These structures emphasize the use of appropriate geometry and dimensions for the enhancement of weakly scattering materials such as a few-layered TMDCs and interfaces.…”