npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2015; 65: 1035-1039

Published online October 30, 2015 https://doi.org/10.3938/NPSM.65.1035

Copyright © New Physics: Sae Mulli.

A Theoretical Study on Light Scattering from and the Morphology-dependent Resonances of Nanowires

WooSeop KWAK1, Seol RYU*2

1 Department of Physics, Chosun University, Gwangju 61452, Korea
2 Department of Chemistry, Chosun University, Gwangju 61452, Korea

Correspondence to:sryu@chosun.ac.kr

Received: July 17, 2015; Revised: August 5, 2015; Accepted: August 14, 2015

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Light scattering from and the morphology-dependent resonances of nano-scale structures depend on their size and shape and on the optical constants of the material. This study presents analytical calculation results for light scattering from and the morphology-dependent resonances of infinitely-long cylindrical nanowires which may serve as a practical model for most nanowires synthesized. The scatttering efficiency tends to red-shift as the real part of the optical constant of nanowire increases or as the radius of the nanowire increases. On the other hand, increasing the imaginary part of optical constant washes away the details of the morphology-dependent resonances in the scattering patterns. The calculated results suggest that high-refractive-index, low-loss materials of relatively large thickness should be experimentally prepared in order to place the scattering from and the resonances of cylindrical nanowires in the optical range of wavelengths for applications of their optical properties.

Keywords: Nanowire, Permittivity, Scattering, Optical properties

나노스케일 구조체의 빛 산란과 형태 의존 공명은 그 물질의 크기와 모양, 그리고 광학 상수 값에 의존한다. 우리는 합성되는 대부분의 나노선에 대한 실제적인 모델로서 무한히 긴 원통형 막대를 선택하고, 이에 의한 빛 산란과 형태 의존 공명의 해석적 계산 결과를 제시하였다. 산란 효율은 광학상수의 실수부가 커지거나 나노선의 반지름이 증가할 경우 적색편이하는 경향을 보였다. 또, 광학상수의 허수부가 증가할 경우에는 산란 패턴에 존재하는 형태 의존 공명의 자세한 무늬가 사라지는 현상이 관찰되었다. 전체적인 계산 결과는 나노선의 광학적 응용을 위하여 주요한 산란과 공명을 가시광선 영역에 두고자 한다면 고굴절 저손실의 비교적 두꺼운 나노선이 실험적으로 제조되어야 함을 시사하였다.

Keywords: 나노선, 유전율, 산란, 광학성질

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