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학술지 Metal Nanoparticle Array as a Tunable Refractive Index Material over Broad Visible and Infrared Wavelengths
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김리향, 정경재, 김주영, 남운용, 박상희, 신종화
ACS Photonics, v.5 no.4, pp.1188-1195
American Chemical Society(ACS)
17PB7100, 덴드라이트 억제를 위한 이온분포제어형 전해질 및 미세패턴 전극기술 기반 리튬금속 이차전지 기술 개발, 이영기
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 region allows the use of particle arrays also as an optical sensor of mechanical strain or the densities of analyte solutions with very small reaction volumes.
KSP 제안 키워드
Curved surface, GAP region, Infrared wavelengths, Large range, Material substitution, Metal particle, Optical sensors, Reaction volumes, effective index, mechanical strain, mechanical stretching