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Titania woodpile photonic crystals are fabricated by a combination of stimulated‐emission depletion direct laser writing and a novel titania double‐inversion procedure. The procedure relies on atomic‐layer deposition, which is also used to fine‐tune the template geometry to maximize the gapsize. Angle‐ and polarization‐resolved transmittance spectroscopy and a comparison with theory provide evidence...
By transferring concepts from stimulated-emission-depletion microscopy to Direct Laser Writing, we improved its lateral and axial resolution significantly. Thus, woodpile photonic crystals with 300-nm lateral rod spacing can be fabricated routinely.
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