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Examples of (a) foam plate and (b) a rod of two-photon polymerization (2PP) fabricated log-pile structures for laser target applications. The foam plate: 1.5 × 1.5 × 0.10 mm3 with a 4 × 4 × 2 μm3 beam lattice structure (density ~0.2 g/cm3). The foam rod: 2.0 × 0.25 × 0.35 mm3 with a 6.2 × 6.2 × 1.0 μm3 beam lattice structure (density ~0.1 g/cm3).
