Abstract
We present the simulation, fabrication, and optical characterization of low-index polymeric rod-connected diamond (RCD) structures. Such complex three-dimensional photonic crystal structures are created via direct laser writing by two-photon polymerization. To our knowledge, this is the first measurement at near-infrared wavelengths, showing partial photonic bandgaps for this structure. We characterize structures in transmission and reflection using angular resolved Fourier image spectroscopy to visualize the band structure. Comparison of the numerical simulations of such structures with the experimentally measured data show good agreement for both P- and S-polarizations.
Highlights
Three-dimensional (3D) photonic crystals (PhCs) with complete or partial photonic bandgaps (PBGs) have attracted keen interest from academia and industry since 1987 [1]
Fabrication, and optical characterization of low-index polymeric rod-connected diamond (RCD) structures
Such complex three-dimensional photonic crystal structures are created via direct laser writing by two-photon polymerization
Summary
Three-dimensional (3D) photonic crystals (PhCs) with complete or partial photonic bandgaps (PBGs) have attracted keen interest from academia and industry since 1987 [1]. Fabrication of 3D structures by direct laser writing (DLW) using two-photon polymerization (TPP) [11] has been studied extensively due to its great flexibility and its capability to precisely recreate complex geometries. The TPP method enhances the resolution providing lateral features down to 100 nm [12,13,14]. This has led to fabrication and demonstration of woodpile PhCs [15] with extensions to controlled spontaneous emission [16], invisibility cloaking [17], and chirality [18,19]
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