Fig. 4: Substitute microdevices.
From: A method for large-scale implantation of 3D microdevice ensembles into brain and soft tissue

The two types of substitute microdevices (microparticles) used in our experiments are displayed (fluorescent microspheres on the left, planar silicon chiplets on the right). The left-hand side displays an unordered collection of particles as received from the vendor, while the right-hand side displays particles organized by the use of a molded “waffle-pack”. The scale factor is shown in the inset for each type of microparticle