Figure 4
(a) Comparison of sensitivity between two-channel scheme (red hollow circles) and single channel scheme (black triangles). Each probe (coupling) Rabi frequency of two-channel structure is equal to the single channel, and the total interaction volume of the two-channel structure is same with that of single channel. The results show the sensitivity about 477 nVcm−1Hz\(^{-1/2}\) for the single channel and the sensitivity about 468 nVcm−1Hz\(^{-1/2}\) for the two-channel, which are almost same for both scheme. (b) Comparison of response bandwidth between two-channel scheme (red hollow circles) and single channel scheme (black triangles). The results show the two-channel scheme (red hollow circles, 872 kHz) has an improvement compared with the single channel scheme (black triangles, 578 kHz). The improved factor is 872/578 ≈ 1.5, which is consistent with the reduction of beam waist by \(\sqrt{2}\), e.g. the reduction of transit time. The error bars are standard deviations of 10 measurements for all data sets