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Thermal Switching of Ultraviolet-Visible Optical Phase in Lithography-Free Plasmonic Metamaterials

AutorToudert, Johann ; Mariscal, A. ; García, Marina ; Petford-Long, A.; Serna, Rosalía
Fecha de publicación28-nov-2017
EditorMaterials Research Society
Citación2017 MRS Spring Meeting & Exhibit (2017)
ResumenPhotonic technologies require the development of compact and lightweight devices suitable for blocking, filtering, focusing, coupling or outcoupling light, and controlling its polarization and phase. Plasmonic metamaterials enable such functionalities at selected frequencies that can be set from the ultraviolet to the infrared by choosing adequately their components and structure.1-3 However, many of them enable only a static control of the properties of light whereas fully functional devices require dynamically tunable optical properties that could shape light on demand and in real-time.4 At such aim, the so-called switchable plasmonic metamaterials have been developed and show already excellent performance as tunable absorbers. However, using them as high-throughput tunable polarizers or phase shifters remains a challenge, especially in the ultraviolet-visible region. We will report two simple plasmonic metamaterial designs fabricated by bottom up physical deposition without lithography. These metamaterial structures allow the thermal switching of the optical phase of visible and ultraviolet light, with a low absorption of the incident beam. The first design consists of size- and shape- controlled noble metal nanostructures sandwiched between dielectric spacers, and the second of 2d assemblies of phase-change bismuth nanostructures embedded in a robust dielectric matrix. In both designs, the nanostructure size, shape and organization drive the topological optical darkness conditions of the metamaterial, which can be achieved at the desired angle of incidence and photon energy even outside of the range of plasmonic absorption. Around the topological optical darkness conditions, we will show that optical phase switching can be achieved by a change of a few oC around a critical temperature that can be deliberately fixed by material design. Especially, using the phase-change bismuth nanostructures that can be molten and solidified around 270oC opens the way to a higher temperature operation compared with noble metal nanostructures.
DescripciónPhoenix, Arizona, April 17-21, 2017. -- https://www.mrs.org/spring2017
URIhttp://hdl.handle.net/10261/167656
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