Journal
NANO LETTERS
Volume 12, Issue 12, Pages 6223-6229Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3032668
Keywords
Metamaterials; gradient meta-surfaces; generalized Snell's law; high impedance surface; reflection phase; surface waves
Categories
Funding
- National Science Council, Taiwan [99-2120-M-002-012, 99-2911-I-002-127, 100-2120-M-002-008, 100-2923-M-002-007-MY3, 100-2112-M-004-002, 100-2923-M-004-001-MY3, 101-2221-E-259-024-MY3, 101-2120-M-259-002]
- National Center for Theoretical Sciences, Taipei Office, Molecular Imaging Center of National Taiwan University
- Research Center for Applied Sciences, Academia Sinica, Taiwan
- National Center for High-Performance Computing, Taiwan
- NSFC [60990321, 11174055, 11204040]
- Program of Shanghai Subject Chief Scientist [12XD1400700]
- MOE of China [B06011]
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We combine theory and experiment to demonstrate that a carefully designed gradient meta-surface supports high-efficiency anomalous reflections for near-infrared light following the generalized Snell's law, and the reflected wave becomes a bounded surface wave as the incident angle exceeds a critical value. Compared to previously fabricated gradient meta-surfaces in infrared regime, our samples work in a shorter wavelength regime with a broad bandwidth (750-900 nm), exhibit a much higher conversion efficiency (similar to 80%) to the anomalous reflection mode at normal incidence, and keep light polarization unchanged after the anomalous reflection. Finite-difference-time-domain (FDTD) simulations are in excellent agreement with experiments. Our findings may lead to many interesting applications, such as antireflection coating, polarization and spectral beam splitters, high-efficiency light absorbers, and surface plasmon couplers.
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