Visualization 1.mp4 Yu Zhang 10.6084/m9.figshare.5965924.v1 https://opticapublishing.figshare.com/articles/media/Visualization_1_mp4/5965924 3-D dark traps for low refractive index bio-cells using single optical fiber Bessel beam 2018-06-04 13:25:21 3-D dark traps low refractive index particle single optical fiber Bessel beam