Abstract
In this paper, we employ an antireflective coating which comprises inverted π-shaped metallic grooves to manipulate the behaviour of a transverse-magnetic (TM)-polarised plane wave transmitted through a periodic nanoslit array. At normal incidence, such scheme cannot only retain the optical curtain effect in the output region but also generate the extraordinary transmission of light through the nanoslits with the total transmission efficiency as high as 90 %. Besides, we show that the spatially invariant field distribution in the output region as well as the field distribution of resonant modes around the inverted π-shaped grooves can be reproduced immaculately when the system is excited by an array of point sources beneath the inverted π-shaped grooves. Furthermore, we investigate the influence of centre groove and side-corners of the inverted π-shaped grooves on suppressing the reflection of light, respectively. Based on our work, it shows promising potential in applications of enhancing the extraction efficiency as well as controlling the beaming pattern of light emitting diodes.
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Acknowledgments
This work is partially supported by the National Natural Science Foundation of China (11204205, 60976018, 61274056 and 60990320), the National Science Foundation (CMMI 0846771), Natural Foundation of Shanxi (2012011020-4), Special Foundation of Taiyuan University of Technology (2012L033), and the Starting Research Fund from Taiyuan University of Technology.
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Cui, Y., Xu, J., Lin, Y. et al. Optical Curtain Effect: Extraordinary Optical Transmission Enhanced by Antireflection. Plasmonics 8, 1087–1093 (2013). https://doi.org/10.1007/s11468-013-9513-2
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DOI: https://doi.org/10.1007/s11468-013-9513-2