Fig. 1: The principle of localizing and detecting the microwave field.
From: Focusing the electromagnetic field to 10−6λ for ultra-high enhancement of field-matter interaction
a Sketch of the nanowire-bowtie antenna. A single-crystal diamond plate is placed under the nanowire. The spin state transition of NV center in diamond is pumped by the localized microwave. b The image of the microwave distribution is obtained by recording the spin-state transition of NV centers at different positions with CSD nanoscopy. The insert is the integrated cross-section profile. The solid line is the fit with Eq. (1). The error bars represent the standard error. The power of the microwave that is radiated by the horn antenna is 14 μW.
