Three-Dimensional Single Gyroid Photonic Crystals with a Mid-Infrared Bandgap
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- 作者：Siying Peng ; Runyu Zhang ; Valerian H. Chen ; Emil T. Khabiboulline ; Paul Braun ; Harry A. Atwater
- 刊名：ACS Photonics
- 出版年：2016
- 出版时间：June 15, 2016
- 年：2016
- 卷：3
- 期：6
- 页码：1131-1137
- 全文大小：632K
- 年卷期：0
- ISSN：2330-4022
文摘
A gyroid structure is a distinct morphology that is triply periodic and consists of minimal isosurfaces containing no straight lines. We have designed and synthesized amorphous silicon (a-Si) mid-infrared gyroid photonic crystals that exhibit a complete bandgap in infrared spectroscopy measurements. Photonic crystals were synthesized by deposition of a-Si/Al2O3 coatings onto a sacrificial polymer scaffold defined by two-photon lithography. We observed a 100% reflectance at 7.5 μm for single gyroids with a unit cell size of 4.5 μm, in agreement with the photonic bandgap position predicted from full-wave electromagnetic simulations, whereas the observed reflection peak shifted to 8 μm for a 5.5 μm unit cell size. This approach represents a simulation-fabrication-characterization platform to realize three-dimensional gyroid photonic crystals with well-defined dimensions in real space and tailored properties in momentum space.