Extreme optical chirality of plasmonic nanohole arrays due to chiral Fano resonance

被引：60

作者：

Kondratov, A. V. ^{[1
]}

Gorkunov, M. V. ^{[1
,2
]}

Darinskii, A. N. ^{[1
]}

Gainutdinov, R. V. ^{[1
]}

Rogov, O. Y. ^{[1
]}

Ezhov, A. A. ^{[1
,3
]}

Artemov, V. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, AV Shubnikov Crystallog Inst, Moscow 119333, Russia

[2] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409, Russia

[3] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 19期

基金：

俄罗斯科学基金会;

关键词：

METAL NANOPARTICLES; CIRCULAR POLARIZERS; METAMATERIALS; SCALE;

D O I：

10.1103/PhysRevB.93.195418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the physical origin of extreme optical chirality of subwavelength arrays of chiral holes in metal. We reconstruct the nanoscale relief of the hole arrays by the atomic-force microscopy and post-process the data to acquire an average unit-cell shape clear of noise and defects. For this shape, we perform the electromagnetic finite difference time domain simulations that reproduce all important features observed by the light-transmission experiments, including the notably strong circular dichroism and optical activity covering the whole range of possible values. To interpret the simulation results, we develop a chiral coupled-mode model which yields analytical expressions that fit accurately the numerical data in a broad wavelength range. Our conclusions undoubtedly link the extreme optical chirality to the plasmon resonances of chiral holes and the associated chiral Fano-type transmission resonance.

引用

页数：10

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