Photonic hyperuniform networks by silicon double inversion of polymer templates

Abstract

Hyperuniform disordered networks belong to a peculiar class of structured materials predicted to possess partial and complete photonic bandgaps for relatively moderate refractive index contrasts. The practical realization of such photonic designer materials is challenging however, as it requires control over a multi-step fabcrication process on optical length scales. Here we report the direct-laser writing of hyperuniform polymeric templates followed by a silicon double inversion procedure leading to high quality network structures made of polycrystalline silicon. We observe a pronounced gap in the shortwave infrared centered at a wavelength of ${\lambda }_{\text{Gap}}\simeq$ 2.5 $\mu$m, in nearly quantitative agreement with numerical simulations. In the experiments the typical structural length scale of the seed pattern can be varied between 2 $\mu$m and 1.54 $\mu$m leading to a blue-shift of the gap accompanied by an increase of the silicon volume filling fraction.

arXiv comment13 pages, 3 figures

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• Optimizing Hyperuniformity in Self-Assembled Bidisperse Emulsions
• Sub-diffusive wave transport and weak localization transition in three-dimensional stealthy hyperuniform disordered systems
• Spatially shaping waves to penetrate deep inside a forbidden gap
• Experimental probe of a complete 3D photonic band gap
• Stealthy and hyperuniform isotropic photonic bandgap structure in 3D
• Scattering from controlled defects in woodpile photonic crystals
• Subdiffusive light transport in three-dimensional subrandom arrays
• Hyperuniformity in amorphous speckle patterns