ANOMALOUS REFRACTION INTO FREE SPACE WITH ALL-DIELECTRIC BINARY METAGRATINGS
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Date
2020-09-30
Authors
Tsitsas, Nikolaos L.
Valagiannopoulos, Constantinos
Journal Title
Journal ISSN
Volume Title
Publisher
PHYSICAL REVIEW RESEARCH
Abstract
Steering the incoming photonic power toward unusual directions, not predicted by Snell’s laws of reflection
and refraction, is a fundamental operation behind numerous wavefront engineering applications. In this study,
strong anomalous transmission is reported to all-dielectric electrically thin structures comprising only two
materials in alternating rectangular posts. These binary metagratings have been thoroughly optimized to support
almost perfect negative refraction by suppressing all the rest of diffraction orders; such an effect is found to
be very robust with respect to oscillation frequency, incident beam angle, and structural defects. In this way,
easy-to-fabricate setups working at different colors of the visible spectrum are determined and may be directly
incorporated in various optical integrated systems from lenses and beamformers to field enhancers and power
splitters
Description
Keywords
Type of access: Open Access, all-dielectric binary metagratings
Citation
Tsitsas, N. L., & Valagiannopoulos, C. (2020). Anomalous refraction into free space with all-dielectric binary metagratings. Physical Review Research, 2(3). https://doi.org/10.1103/physrevresearch.2.033526