Figure 4


Download original image

Signal of the QPD in the xy plane for a displacement of the bead of 300 nm, versus trapped-bead height. The height is calculated from the number N of dark fringes observed from contact to the slide as h = ND + R, with D = 402 nm and R = 1.5 μm. The values obtained using the objective with a phase contrast ring (blue) or without (red) are compared.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.