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Beam Diameter to Permit Pia Penetration
| Materials | Diamond (Klein and Cardinale, 1993) | Carbon fiber (Kozai et al., 2012a) | Tungsten (Du et al., 2017) | Silicon (Joo et al., 2019) | SU-8 (Lorenz et al., 1997) | Polyimide (Rousche et al., 2001) | PEG (Paxton et al., 2009) |
|---|---|---|---|---|---|---|---|
| Young's modulus (GPa) | 1,100 | 234 | 411 | 179 | 2.3 | 2.5 | 1.3 |
| d at 1 mN bulking force (μm) | 7.4 | 10.9 | 10.0 | 11.5 | 34.4 | 33.8 | 39.8 |
| Min d (μm) | 3.1 | 5.1 | 4.3 | 5.6 | 22.8 | 22.2 | 27.5 |
