Fig. 1: Functionalization of ECFs with 2D materials.
From: In-fibre second-harmonic generation with embedded two-dimensional materials
a, Illustration of the concept to demonstrate SHG with embedded 2D materials on an ECF. ω, Fundamental frequency; 2ω, Second harmonic. b, Cross-sectional SEM image of the core region of the ECF. The dotted circle denotes the effective core area of the ECF. The exposed surface is highlighted by a dashed yellow curve. c, Top-view PL mapping of a section of MoS2-coated ECF. d, PL emission spectrum from a typical monolayer of MoS2 in c under the excitation of a 532 nm laser after filtering by long-pass filters at 550 nm.
