Wenya Zhang, Jian Chen, Weixin Lu, Bo Hou
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| The schematic picture of the photonic crystal which is a simple cubic lattice of square cross-sectioned rods. (b) The zoomed-in view where a denotes the lattice constant and d denotes the rod size. (c) The photo of the fabricated sample with an overall size of ∼40 × 40 × 7 mm3. (d) The optical microscopy photo (top view) where the lattice constant and the rod size are 580 μm and 130 μm, respectively. |
https://aip.scitation.org/doi/10.1063/1.5123655
We have fabricated a three-dimensional (3D) microlattice, composed of orthogonal polymer rods along three dimensions and featured with a sub-millimeter scale size, with a photopolymerizing 3D printer. The reflection and transmission spectra of the microlattice have been measured in terahertz time-domain spectroscopy and compared with numerical simulations. Due to Debye relaxation loss of the constituent photopolymer, the microlattice gives rise to absorption in the measured frequencies. In particular, the absorption modulation is observed across the bandgap, corresponding to the lower/upper band edges, and is a straightforward manifestation of the Borrmann effect.
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