A semiconductor metasurface with multiple functionalities: A polarizing beam splitter with simultaneous focusing ability

We propose a semiconductor metasurface that simultaneously performs two independent functions: focusing and polarization filtering. The wavefronts of the reflected and transmitted light distributions are precisely manipulated by spatial parametric variation of a subwavelength thin-film Si grating, w...

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Bibliographic Details
Published in:Applied physics letters 2014-06, Vol.104 (23)
Main Authors: Lee, Jun Hyung, Woong Yoon, Jae, Jin Jung, Myoung, Kyun Hong, Jong, Ho Song, Seok, Magnusson, Robert
Format: Article
Language:English
Subjects:
Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISTRIBUTION
EFFICIENCY
Filtration
Gaussian beams (optics)
GRATINGS
Metasurfaces
POLARIZATION
POLARIZED BEAMS
Power efficiency
SEMICONDUCTOR MATERIALS
SILICON
THIN FILMS
VISIBLE RADIATION
Wave fronts
WAVELENGTHS
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Summary:We propose a semiconductor metasurface that simultaneously performs two independent functions: focusing and polarization filtering. The wavefronts of the reflected and transmitted light distributions are precisely manipulated by spatial parametric variation of a subwavelength thin-film Si grating, which inherently possesses polarization filtering properties. We design a 12-μm-wide metasurface containing only nineteen Si grating ridges. Under a 10-μm-wide unpolarized Gaussian beam incidence at wavelength of 1.55 μm, the resulting device shows promising theoretical performance with high power efficiency exceeding 80% and polarization extinction ratio of ∼10 dB with focal spot diameters near 1–2 μm.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4883746