Dielectric Walls/Layers Modulated 3D Periodically Structured SERS Chips: Design, Batch Fabrication, and Applications. Issue 15 (24th March 2022)

• Record Type: Journal Article
• Authors: Tian, Yi; Hu, Haifeng; Chen, Peipei; Dong, Fengliang; Huang, Hui; Xu, Lihua; Yan, Lanqin; Song, Zhiwei; Xu, Taoran; Chu, Weiguo
• Is Part Of: Advanced science. Volume 9:Issue 15(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-24
• Subjects: batch fabrication -- dielectric walls/layers -- localized surface plasmon resonance (LSPR) -- SERS chip design -- surface plasmon polariton (SPP) -- trace detection; Science -- Periodicals; 505
• DOI: 10.1002/advs.202200647
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: As an indispensable constituent of plasmonic materials/dielectrics for surface enhanced Raman scattering (SERS) effects, dielectrics play a key role in excitation and transmission of surface plasmons which however remain more elusive relative to plasmonic materials. Herein, different roles of vertical dielectric walls, and horizontal and vertical dielectric layers in SERS via 3D periodic plasmonic materials/dielectrics structures are studied. Surface plasmon polariton (SPP) interferences can be maximized within dielectric walls besieged by plasmonic layers at the wall thicknesses of integral multiple half‐SPPplasmonic material‐dielectric ‐wavelength which effectively excites localized surface plasmon resonance to improve SERS effects by one order of magnitude compared to roughness and/or nanogaps only. The introduction of extra Au nanoparticles on thin dielectric layers can further enhance SERS effects only slightly. Thus, the designed Au/SiO2 based SERS chips show an enhancement factor of 8.9 × 10 10, 265 times higher relative to the chips with far thinner SiO2 walls. As many as 1200 chips are batch fabricated for a 4 in wafer using cost‐effective nanoimprint lithography which can detect trace Hg ions as low as 1 ppt. This study demonstrates a complete generalized platform from design to low‐cost batch‐fabrication to applications for novel high performance SERS chips of any plasmonic materials/dielectrics. Abstract : The roles of dielectrics in surface enhanced Raman scattering (SERS) via 3D periodic structures are recognized both theoretically and experimentally, which are quantitatively explored. The contribution from surface plasmon polariton interferences as secondary sources to SERS effects by designing the dimensions of dielectric walls can be one order of magnitude higher than that caused simply by roughness and/or nanogaps.