Buried Nanoantenna Arrays: Versatile Antireflection Coating
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Kabiri, Ali
Girgis, Emad
Capasso, Federico
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https://doi.org/10.1021/nl403257aMetadata
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Kabiri, Ali, Emad Girgis, and Federico Capasso. 2013. “Buried Nanoantenna Arrays: Versatile Antireflection Coating.” Nano Letters 13 (12): 6040–47. https://doi.org/10.1021/nl403257a.Abstract
Reflection is usually a detrimental phenomenon in many applications such as flat-panel-displays, solar cells, photodetectors, infrared sensors, and lenses. Thus far, to control and suppress the reflection from a substrate, numerous techniques including dielectric interference coatings, surface texturing, adiabatic index matching, and scattering from plasmonic nanoparticles have been investigated. A new technique is demonstrated to manage and suppress reflection from lossless and lossy substrates. It provides a wider flexibility in design versus previous methods. Reflection from a surface can be suppressed over a narrowband, wideband, or multiband frequency range. The antireflection can be dependent or independent of the incident wave polarization. Moreover, antireflection at a very wide incidence angle can be attained. The reflection from a substrate is controlled by a buried nanoantenna array, a structure composed of (1) a subwavelength metallic array and (2) a dielectric cover layer referred to as a superstrate. The material properties and thickness of the superstrate and nanoantennas' geometry and periodicity control the phase and intensity of the wave circulating inside the superstrate cavity. A minimum reflectance of 0.02% is achieved in various experiments in the mid-infrared from a silicon substrate. The design can be integrated in straightforward way in optical devices. The proposed structure is a versatile AR coating to optically impedance matches any substrate to free space in selected any narrow and broadband spectral response across the entire visible and infrared spectrum.Citable link to this page
http://nrs.harvard.edu/urn-3:HUL.InstRepos:41371310
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