Figure 1: Schematic illustration of the spectroscopy design with graphene grating.
From: Vibrational spectroscopy at electrolyte/electrode interfaces with graphene gratings
(a) The electrochemical cell and spectroscopy configuration. Fused silica substrates are used as cell windows. The diffraction singals originate from an effective grating formed by periodic graphene/electrolyte and fused silica/electrolyte interfaces. The incident light electric field Ein is p-polarized, and the first-order diffraction is collected at the diffraction angle θ=25.9°. (b) Optical microscopic image of a graphene grating on fused silica. The bright ribbons are graphene and the grating period is 8 μm. (c) The diffraction signal is generated by a periodic variation of the optical susceptibility at the interface, which comes from both the graphene grating itself and the different adsorbed molecules like CTAB and chemical species in the electrolyte double layer induced by the graphene grating. Pt, platinum.
