Thue-Morse nanostructures for tunable light extraction in the visible region
| Autor: | Volodymyr Tkachenko, Cesare Umeton, Lucia Petti, Antigone Marino, Riccardo Castagna, Giovanna Palermo, Nelson V. Tabiryan, Alfredo Pane, Massimo Rippa |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Diffraction
Materials science business.industry Mechanical Engineering Single-mode optical fiber Metamaterial Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Photonic metamaterial Light intensity Optics Liquid crystal 0103 physical sciences Optoelectronics Electrical and Electronic Engineering Photonics 010306 general physics 0210 nano-technology business TUNABLE LIGHT EXTRACTION LIQUID CRYSTALS QUASI-CRYSTALS PLASMONICS Photonic crystal |
| Zdroj: | Optics and lasers in engineering 104 (2018): 291–299. doi:10.1016/j.optlaseng.2017.09.008 info:cnr-pdr/source/autori:Rippa M.; Castagna R.; Marino A.; Tkachenko V.; Palermo G.; Pane A.; Umeton C.; Tabiryan N.; Petti L./titolo:Thue-Morse nanostructures for tunable light extraction in the visible region/doi:10.1016%2Fj.optlaseng.2017.09.008/rivista:Optics and lasers in engineering/anno:2018/pagina_da:291/pagina_a:299/intervallo_pagine:291–299/volume:104 |
| Popis: | Controlling light propagation at the nanoscale is a fascinating opportunity offered by modern photonics, more than a challenge to face off. This study is aimed at investigating a particular kind of nanocomposite and reconfigurable optical metamaterials that can be exploited for the realization of a new class of switchable photonic devices, representing a breakthrough with respect to the state of the art. Existing photonic devices exhibit, in general, a drawback in the absence of tunability; this work aims to the design and characterization of metamaterials exploiting reconfigurable media, like LCs, which enable realization of a tunable, high quality, photonic quasi-crystal based switchable mode selector. It turned out that, starting from an unpolarized white light source, through a light extraction mechanism based on the diffraction of light, the high quality structure, combined with a uniformly aligned Photo-responsive Liquid Crystal (PLC), is able to give rise to an extremely narrow (FWHM ≈5 nm) and linearly polarized single mode peak of the extracted light intensity. Moreover, we have shown that the spectral properties (switching) of the samples can be finely controlled by using both an external applied voltage and a suitable pump light source with a maximum increase of 45% of the extracted light. Finally, both Scanning Electron Microscopy (SEM) and Far Field Diffraction (FFD) analysis have shown the high quality morphology of the realized structure. |
| Databáze: | OpenAIRE |
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