圆柱/圆环等离结构的可调极化不敏感Fano共振
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摘要
本文设计了中心为一个圆柱/圆环型子单元、四周环绕六个圆柱/圆环型子单元的对称等离结构,模拟发现该结构展示出可调极化不敏感性Fano共振现象。通过将圆柱/圆环型簇结构中四周各圆柱沿径向向内、向外移动,结果发现,Fano共振的强弱、个数和位置与四周圆柱的位置密切相关,合适地选定圆柱的位置,可以获得不同特性的Fano共振,进而实现对Fano共振的调谐。此外,将模型加以旋转,发现Fano共振的强弱、个数和位置几乎没有变化,这表明该结构具有极化不敏感特性,这大大提升结构在光电器件方面的可能应用。
In this paper,we proposed a symmetric plasmonic structure of which unit cell is composed of a cylinder / ring sub-unit-cell surrounded by six cylinder / ring sub-unit-cells. Simulating reflection and transmittance of the structure,we find that tunable porlarization-insensitive Fano resonances occur. We also investigated the change rule of the Fano resonances when the six cylinders in the six cylinder / ring sub-unit-cells simultaneously move inward or outward. It is found that the intensities,numbers and positions of the Fano resonances are relative close to the positions of the six cylinders. Therefore,by shifting their positions,we can obtain different Fano resonances,which indicates that the Fano resonances are tunable. Additionally,changing the polarization directions of the incident wave,we find that it is almost unchanged for the intensities,numbers and positions of the Fano resonances,implying that the structure is porlarization-insensitive.
In this paper,we proposed a symmetric plasmonic structure of which unit cell is composed of a cylinder / ring sub-unit-cell surrounded by six cylinder / ring sub-unit-cells. Simulating reflection and transmittance of the structure,we find that tunable porlarization-insensitive Fano resonances occur. We also investigated the change rule of the Fano resonances when the six cylinders in the six cylinder / ring sub-unit-cells simultaneously move inward or outward. It is found that the intensities,numbers and positions of the Fano resonances are relative close to the positions of the six cylinders. Therefore,by shifting their positions,we can obtain different Fano resonances,which indicates that the Fano resonances are tunable. Additionally,changing the polarization directions of the incident wave,we find that it is almost unchanged for the intensities,numbers and positions of the Fano resonances,implying that the structure is porlarization-insensitive.
引文
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[18]E.D.Palik.Handbook of Optical Constants of Solids[M].New York:Academic Press,1998.
[2]F.Hao,P.Nordlander,Y.Sonnefraud,et al.Tunability of subradiant dipolar and Fano-type plasmon resonances in metallic ring/disk cavities:Implications for nanoscale optical sensing[J].ACS Nano,2009,3(3):643-652.
[3]S.Zhang,D.A.Genov,Y.Wang,et al.Plasmon-induced transparency in metamaterials[J].Physical Review Letters,2008,101(4):047401.
[4]N.Liu,L.Langguth,T.Weiss,J.Kstel,et al.Plasmonic analogue of electromagnetically induced transparency at the Drude damping limit[J].Nature Materials,2009,8(9):758-762.
[5]Y.Sonnefraud,N.Verellen,H.Sobhani,et al..Experimental realization of subradiant,superradiant,and Fano resonances in ring/disk plasmonic nanocavities[J].ACS Nano,2010,4(3):1664-1670.
[6]Y.Zhang,T.Q.Jia,S.A.Zhang,et al..Dipole,quadrupole and octupole plasmon resonance modes in non-concentric nanocrescent/nanodisk structure:local field enhancement in the visible and near infrared regions[J].Optics Express,2012,20(3):2924-2931.
[7]J.A.Fan,C.Wu,K.Bao,et al..Self-assembled plasmonic nanoparticle clusters[J].Science,2010,328(5982):1135-1138.
[8]M.Hentschel,M.Saliba,R.Vogelgesang,et al..Transition from isolated to collective modes in plasmonic oligomers[J].Nano Letters,2010,10(7):2721-2726.
[9]M.Frimmer,T.Coenen,and A.F.Koenderink,Signature of a Fano resonance in a plasmonic metamolecule’s local density of optical states[J].Physical Review Letters,2012,108(7):077404.
[10]V.A.Fedotov,M.Rose,S.L.Prosvirnin,et al..Sharp trapped-mode resonances in planar metamaterials with a broken structural symmetry[J].Physical Review Letters,2007,99(14):147401.
[11]N.I.Zheludev,S.L.Prosvirnin,N.Papasimakis,et al..Lasing spaser[J].Nat.Photon,2008,2(6):351-354.
[12]N.Papasimakis,Y.H.Fu,V.A.Fedotov,et al..Metamaterial with polarization and direction insensitive resonant transmission response mimicking electromagnetically induced transparency[J].Applied Physics Letters,2009,94(21):211902.
[13]A.E.Nikolaenko,F.D.Angelis,S.A.Boden,et al..Carbon nanotubes in a photonic metamaterial[J].Physical Review Letters,2010,104(15):153902.
[14]S.D.Liu,Z.Yang,R.P.Liu,et al..Plasmonic-induced optical transparency in the near-infrared and visible range with double split nanoring cavity[J].Optics Express,2011,19(16):15363-15370.
[15]A.Christ,S.G.Tikhodeev,N.A.Gippius,et al..Waveguideplasmon polaritons:Strong coupling of photonic and electronic resonances in a metallic photonic crystal slab[J].Physical Review Letters,2003,91(18):183901.
[16]W.Chen,G.Y.Chen,and Y.N.Chen,Controlling Fano resonance of nanowire surface plasmons[J].Optics.Letters,2011,36(18):3602-3604.
[17]M.T.Cheng and Y.Y.Song,Fano resonance analysis in a pair of semiconductor quantum dots coupling to a metal nanowire[J].Optics.Letters,2012,37(5):978-980.
[18]E.D.Palik.Handbook of Optical Constants of Solids[M].New York:Academic Press,1998.