Journal: Scientific Reports

Article Title: Microparticle manipulation using laser-induced thermophoresis and thermal convection flow

doi: 10.1038/s41598-020-76209-9

Figure Lengend Snippet: Experimental setup and demonstration of manipulation of cells and microbeads using optical-thermophoretic tweezing. ( a ) Schematic of the experimental setup; ① and ③: aspheric condenser lenses with different focal lengths, ②: condenser/field diaphragm, ④: 50:50 beamsplitter, ⑤: tube lens, ⑥: aspheric collimation lens, ⑦ and ⑧: bi-convex lenses with different focal lengths, ⑨: short pass dichroic filter. (This schematic was created by Inkscape v0.91, URL: https://inkscape.org/ ). ( b ) 3D schematics of the sample device and the microparticle motion in a localized temperature field established by laser heating on a SWNT cluster. The actual dimensions of the fluid volume inside the chamber were 20 mm ( L ) × 13 mm ( W ) × 100 µm ( H ) (this schematic was created by SolidWorks v2019, URL: https://www.solidworks.com/ ). ( c , d ) Image stack at 0 s and after 30 s, showing microparticle manipulation by a laser illuminated SWNT cluster (for full record, see Supplementary Video ). Cells and microbeads were trapped and confined in a ring-shaped region around the cluster. Laser spot size (highlighted by the red dashed ovals): Φ 2.5 µm in the x -direction, Φ 52.9 µm in the y -direction.

Article Snippet: The actual dimensions of the fluid volume inside the chamber were 20 mm ( L ) × 13 mm ( W ) × 100 µm ( H ) (this schematic was created by SolidWorks v2019, URL: https://www.solidworks.com/ ). ( c , d ) Image stack at 0 s and after 30 s, showing microparticle manipulation by a laser illuminated SWNT cluster (for full record, see Supplementary Video ).

Techniques: