Controllable fabrication of visible-spectrum 3D photonic crystals.

Suspended pyrolysis-assisted two-photon polymerization enables controllable fabrication of visible-spectrum 3D diamond photonic crystals with a 5.75 nm lattice-period standard deviation.

• Why it matters: Visible-spectrum 3D photonic crystals are hard to manufacture because existing methods struggle to combine high precision with enough geometric freedom.
• What they did: The authors use SP-TPP printing to build 3D diamond PhCs, then assess structural uniformity via lattice-period statistics and optical uniformity using microscopic reflection spectra.
• The result: The printed PhCs show uniform optical responses across spatial positions, and by tuning lattice period and duty cycle they realize diverse-wavelength devices, supported by prototype demonstrations and in situ arrayed fabrication.

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