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Observation of light propagation through a three-dimensional cavity superlattice in a 3D photonic band gap
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Observation of light propagation through a three-dimensional cavity superlattice in a 3D photonic band gap

Manashee Adhikary, Marek Kozon, Ravitej Uppu and Willem L Vos
03/28/2023
DOI: 10.48550/arxiv.2303.16018
url
https://doi.org/10.48550/arxiv.2303.16018View
Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

We experimentally investigate unusual light propagation inside a three-dimensional (3D) superlattice of resonant cavities that are confined within a 3D photonic band gap. Therefore, we fabricated 3D diamond-like photonic crystals from silicon with a broad 3D band gap in the near-infrared and doped them with a periodic array of point defects. In position-resolved reflectivity and scattering microscopy, we observe narrow spectral features that match well with superlattice bands in band structures computed with the plane wave expansion. The cavities are coupled in all three dimensions when they are closely spaced and uncoupled when they are further apart. The superlattice bands correspond to light that hops in high symmetry directions in 3D - so-called Cartesian Light - that opens applications in 3D photonic networks, 3D Anderson localization of light, and future 3D quantum photonic networks.

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