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. Author manuscript; available in PMC: 2012 Dec 21.
Published in final edited form as: Lab Chip. 2011 Nov 3;11(24):4248–4259. doi: 10.1039/c1lc20627c

Figure 2.

Figure 2

Various cell designs for DEP tweezers. (a) Geometry A: A probe above a flat electrode. (b) Geometry B: A probe in a shallow microwell fabricated on top of an electrode (well depth h1 < bead diameter). (c) Geometry C: A probe inside a deep microwell fabricated on top of an electrode (well depth h2 > bead diameter). (d) Geometry D: A microwell on top of a thick gold layer (thickness t1=135 nm), whose primary purpose is to block the light from entering the photoresist layer making layout suitable for TIRFM detection. The thin gold layers (thickness t2=14 nm) act as the electrodes. The standard dimensions for all wells used in this work had w=4.2 μm and s=24 μm (unless varied on purpose). The center-to-center distance for the wells was 44.2 μm.