Journal
ACS PHOTONICS
Volume 5, Issue 4, Pages 1370-1374Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01400
Keywords
metamaterials; effective medium theory; refraction; reflection; optical resonators
Categories
Funding
- Center for Advanced Meta Materials (CAMM) - Ministry of Science, ICT and Future Planning as a Global Frontier Project [CAMM-2014M3A6B3063710]
- Korea University Grant through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2017R1A6A3A11034238]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2017R1A6A3A11034238]
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Negative-index metamaterials are significantly limited by their inherent losses. We demonstrate that a negative index without dissipative and reflective losses can be achieved in subwavelength dielectric cuboid arrays. We can avoid reflection by making dielectric cuboids exhibit the resonant forward scattering of light, while dissipative loss is inherently absent in dielectric materials. A joint study combining theoretical and experimental research demonstrates that loss-free negative-index metamaterials can be realized. They fulfill the criteria of negative refraction based on causality, while conventional active loss compensation schemes lead to the disappearance of negative refraction by causality.
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