Metal Nanoparticle Array as a Tunable Refractive Index Material over Broad Visible and Infrared Wavelengths
| Autor: | Sang-Hee Ko Park, Kyungjae Chung, Yunyong Nam, Ju Young Kim, Reehyang Kim, Jonghwa Shin |
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| Rok vydání: | 2018 |
| Předmět: |
Range (particle radiation)
Materials science business.industry Infrared Physics::Optics Resonance Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Wavelength Optoelectronics Diamagnetism Self-assembly Electrical and Electronic Engineering 0210 nano-technology business Refractive index Biotechnology |
| Zdroj: | ACS Photonics. 5:1188-1195 |
| ISSN: | 2330-4022 |
| Popis: | Common materials show a limited range of refractive indices over the visible and infrared wavelengths, and their values are not easily tunable once the material is chosen. Here, self-assembled metal nanoparticle arrays are proposed as an effective optical material with a large range of possible refractive indices that are nearly dispersionless over broad wavelength ranges. The material can be potentially fabricated over a large curved surface, and the resulting index is even more tunable by various postprocessing methods, such as material substitution or mechanical stretching. We achieve the highest refractive index of 5.0 at resonance in the visible, exceeding 4.2 over a broadband wavelength regime out of resonance. The key differences from previous studies of self-assembled metal particle arrays are the consideration of the diamagnetic effect and the careful choice of the ligands, which determine the gaps between particles. The sensitivity of the effective index to the size and material of the gap regio... |
| Databáze: | OpenAIRE |
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