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The architected nanolattices have the potential to serve as new optical components and devices across infrared frequencies.
Julia R. Greer's lab has demonstrated and reported the first all-angle negative refraction 3D photonics crystal for mid-IR light. Appearing in Nano Letters, the publication's abstract describes. "[e]ngineering of the dispersion properties of a photonic crystal (PhC) opens a new paradigm for the design and function of PhC devices. Exploiting the dispersion properties of PhCs allows control over wave propagation within a PhC. We describe the design, fabrication, and experimental observation of photonic bands for 3D PhCs capable of negative refraction in the mid-infrared. Band structure and equifrequency contours were calculated to inform the design of 3D polymer–germanium core–shell PhCs, which were fabricated using two-photon lithography direct laser writing and sputtering. We successfully characterized a polymer–Ge core–shell lattice and mapped its band structure, which we then used to calculate the PhC refraction behavior. An analysis of wave propagation revealed that this 3D core–shell PhC refracts light negatively and possesses an effective negative index of refraction in the experimentally observed region. These results suggest that architected nanolattices have the potential to serve as new optical components and devices across infrared frequencies."
This work was done in collaboration with former graduate student Siying Peng of the Atwater Group.
Read the full article, "Dispersion Mapping in 3-Dimensional Core–Shell Photonic Crystal Lattices Capable of Negative Refraction in the Mid-Infrared", authored by Victoria F. Chernow, Ryan C. Ng, Siying Peng, Harry A. Atwater, and Julia R. Greer.