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Published June 15, 2016 | Supplemental Material + Submitted
Journal Article Open

Three-Dimensional Single Gyroid Photonic Crystals with a Mid-Infrared Bandgap


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/Al_2O_3 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.

Additional Information

© 2016 American Chemical Society. Received: April 20, 2016; Publication Date (Web): May 23, 2016. This work is part of the Light Material Interactions in Energy Conversion Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001293. The authors thank George Rossman for FT-IR assistance, the Kavli Nanoscience Institute at Caltech for cleanroom facilities, the Lewis Group ALD facility at Caltech, and V. W. Brar and F. Liu for insightful discussions. The authors declare no competing financial interest.

Attached Files

Submitted - 1604.03675.pdf

Supplemental Material - ph6b00293_si_001.pdf


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