Optical beam shaping by Dirac-mass engineered topological junction metasurfaces

Ki Young Lee; Jae Woong Yoon

doi:10.1117/12.2677181

4 October 2023 Optical beam shaping by Dirac-mass engineered topological junction metasurfaces

Ki Young Lee, Jae Woong Yoon

Proceedings Volume PC12646, Metamaterials, Metadevices, and Metasystems 2023; PC1264607 (2023) https://doi.org/10.1117/12.2677181
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

The transportation of in-plane photonic topological states, achieved by mimicking electronic systems, has gained a lot of attention. However, there has not been much exploration of their out-of-plane radiation effects. By treating leakage radiation, the concept of the band topology can be extended to resonant metasurfaces, providing new opportunities to directly measure them and to create new features for free-space applications. In this talk, we examine the basic mechanisms of far-field radiation and resonant excitation in topological junction metasurfaces made of thin film dielectric subwavelength gratings. These structures have distinctive topological characteristics such as complex Dirac masses, Berry phases, and band structures shown through Fano spectral responses. Considering the correlation between the topological quantities and structural parameters, we discuss new optical functionalities discovered in the topological metasurfaces such as Dirac-mass engineered beam shaping.

Conference Presentation

Citation Download Citation

Ki Young Lee and Jae Woong Yoon "Optical beam shaping by Dirac-mass engineered topological junction metasurfaces", Proc. SPIE PC12646, Metamaterials, Metadevices, and Metasystems 2023, PC1264607 (4 October 2023); https://doi.org/10.1117/12.2677181

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