Evidence of near-infrared partial photonic bandgap in polymeric rod-connected diamond structures

TL;DR

This paper demonstrates the first near-infrared measurement of partial photonic bandgaps in polymeric rod-connected diamond structures, created via two-photon polymerization, with optical characterization confirming simulation predictions.

Contribution

It introduces a novel fabrication and measurement approach for polymeric RCD photonic crystals, showing partial bandgaps at near-infrared wavelengths with experimental validation.

Findings

First near-infrared measurement of partial photonic bandgaps in RCD structures

Good agreement between simulations and experimental data for transmission and reflection

Successful fabrication of complex 3D polymeric photonic crystals

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.