We demonstrate this process by fabricating titania woodpile structures with lateral dimensions of 70 × 70 μm and lateral periodicities between 1.0 and 1.3 μm. Fourier Transform Infrared (FTIR) spectroscopy reveals passive tuning of the reflectance peak between 1.7 and 2.3 μm, which agrees with Plane Wave Expansion simulations. This titania AM process offers a promising pathway to efficiently fabricate complex 3D nano-architectures out of a high-index material for 3D dielectric photonic crystals in the visible and the infrared.
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Andrey Vyatskikh, Ryan C. Ng, Bryce Edwards, Julia R. Greer, "Additive manufacturing of titanium dioxide for dielectric photonic crystals," Proc. SPIE 10930, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XII, 109300H (4 March 2019);