2021/07/15 by Li Lu, Lu, Li, Zhaogang Dong +17 · 1 citation
Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #Dielectric #FOS: Physical sciences #Germanium #Light scattering #Materials science #Metamaterials and Metasurfaces Applications #Mie scattering #Nanophotonics #Optics #Optics (physics.optics) #Optoelectronics #Phase-change materials and chalcogenides #Photonic Crystals and Applications #Physics #Scattering #Silicon #Visible spectrum #physics.app-ph #physics.optics
paper · pdf · doi:10.48550/arxiv.2107.07081
published in arXiv (Cornell University) (Cornell University) · 36 pages, 5 figures in main text, 9 figures in supporting information
arxiv created 2021/07/15 · openalex publication_date 2021/07/15 · arxiv updated 2021/07/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
Dielectric optical nanoantennas play an important role in color displays, metasurface holograms, and wavefront shaping applications. They usually exploit Mie resonances as supported on nanostructures with high refractive index, such as Si and TiO2. However, these resonances normally cannot be tuned. Although phase change materials, such as the germanium-antimony-tellurium alloys and post transition metal oxides, such as ITO, have been used to tune optical antennas in the near infrared spectrum, tunable dielectric antennae in the visible spectrum remain to be demonstrated. In this paper, we designed and experimentally demonstrated tunable dielectric nanoantenna arrays with Mie resonances in the visible spectrum, exploiting phase transitions in wide-bandgap Sb2S3 nano-resonators. In the amorphous state, Mie resonances in these Sb2S3 nanostructures give rise to a strong structural color in reflection mode. Thermal annealing induced crystallization and laser induced amorphization of the Sb2S3 resonators allow the color to be tuned reversibly. We believe these tunable Sb2S3 nanoantennae arrays will enable a wide variety of tunable nanophotonic applications, such as high-resolution color displays, holographic displays, and miniature LiDAR systems.