CAJ | 학술논문

同轴纳米环结构由于具有特殊的光学特性,近年来引起了科学界的广泛关注.本文将重点研究在以纳米环形结构为基础的法布里-珀罗腔中所存在的两种形式的表面等离子共振,平面型和传输型.通过使用固定圆环阵列的周期而只改变圆环孔径大小的方法来实现调节传输型共振并达到滤波的效果.同时,控制圆环阵列的周期使其足够大,从而使得平面型共振峰位于近红外波段,以避免对处于可见光波段的传输型共振模式形成干扰,最终实现滤光效果.在实验中,通过使用周期固定为1200 nm而孔径大小从10到180 nm (以10 nm递增)的同轴圆环结构,实现了把一束宽带的白光源分成不同颜色的单色光.实验结果表明,该方法解决了天线凹槽和一维层堆光栅型滤光器都普遍存在的偏振敏感性问题,使得类似滤光器件的应用范围更广,更能适应非偏振的自然光.通过有限时域差分法分析得到的理论计算结果和实验结果相匹配,实验现象得到了很好的理论支持和解释.
동축납미배결구유우구유특수적광학특성,근년래인기료과학계적엄범관주.본문장중점연구재이납미배형결구위기출적법포리-박라강중소존재적량충형식적표면등리자공진,평면형화전수형.통과사용고정원배진렬적주기이지개변원배공경대소적방법래실현조절전수형공진병체도려파적효과.동시,공제원배진렬적주기사기족구대,종이사득평면형공진봉위우근홍외파단,이피면대처우가견광파단적전수형공진모식형성간우,최종실현려광효과.재실험중,통과사용주기고정위1200 nm이공경대소종10도180 nm (이10 nm체증)적동축원배결구,실현료파일속관대적백광원분성불동안색적단색광.실험결과표명,해방법해결료천선요조화일유층퇴광책형려광기도보편존재적편진민감성문제,사득유사려광기건적응용범위경엄,경능괄응비편진적자연광.통과유한시역차분법분석득도적이론계산결과화실험결과상필배,실험현상득도료흔호적이론지지화해석.
Coaxial nanoring structures have attracted extensive attention in recent years due to their peculiar optical properties. In this article, we investigate two different types of resonances in plasmonic Fabry-P′erot cavities, planar surface plasmon and propagating surface plasmon. Using nanoring arrays with the same periodicity and different gaps, we can tune propagating surface plasmons and finally filter individual colors out. With large periodicities, planar surface plasmon resonance can be fixed in the near infrared range to avoid any disturbance on propagating surface plasmon resonance which is located in visible frequencies. In this work, we filter a broadband white source into different colors by using nanoring arrays with a fixed periodicity of 1200 nm and varying gaps range from 10 nm to 180 nm (in steps of 10 nm). Compared with one-dimensional nanoslits or metal-insulator-metal (MIM) nanogratings, nanoring structures present polarization independence to the incident light, leading to more functional devices and broader applications (applicable to natural light, for instance). Finite-difference time-domain (FDTD) simulations accord well with measurements, which confirms our conclusions and supports our explanations.