双层开口环的圆二色性数值研究
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摘要
基于琼斯矩阵的推导提出一种金属手性纳米结构-双层开口环阵列结构,其开口方向扭转一定角度以破坏对称性,并应用有限元方法研究圆二色性(CD)特性.研究表明:在左旋圆偏振光与右旋圆偏振光的激发下,该结构表现出巨大差异使得CD产生,其CD值达到0.34.结构的电流分布表明,在短波长处,上下层圆环的等效偶极子耦合可形成反键模式,在长波长处,上下层圆环的等效偶极子耦合可形成成键模式,研究结构参数对CD的影响.理解圆二色的物理机制,并提供一种设计手性结构的方法.
Based on Jones matrix, we propose a metal nanostructure consisting of double-layer split rings, in which the opening direction between up and down split rings is twisted to break symmetry. CD effect of the nanostructure and mechanism is studied with finite element method. It shows that under excitation of left-handed circularly polarized light and right-handed circularly polarized light the structure shows different transmission. Its CD value reaches 0.34. Current density distributions show that at short resonant wavelengths equivalent dipoles of upper and bottom split-rings form antibonding mode, and at long resonant wavelengths equivalent dipoles of upper and bottom split-rings form bonding mode. These results facilitates understanding of physical mechanism of CD. It provides a way to design chiral nanostructure.
Based on Jones matrix, we propose a metal nanostructure consisting of double-layer split rings, in which the opening direction between up and down split rings is twisted to break symmetry. CD effect of the nanostructure and mechanism is studied with finite element method. It shows that under excitation of left-handed circularly polarized light and right-handed circularly polarized light the structure shows different transmission. Its CD value reaches 0.34. Current density distributions show that at short resonant wavelengths equivalent dipoles of upper and bottom split-rings form antibonding mode, and at long resonant wavelengths equivalent dipoles of upper and bottom split-rings form bonding mode. These results facilitates understanding of physical mechanism of CD. It provides a way to design chiral nanostructure.
引文
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[2] SHERMAN G M.Circular dichroism of long wavelength forms of chlorophyll [J].Nature,1969,224(5224):1108.
[3] KELLY S M,JESS T J,PRICE N C.How to study proteins by circular dichroism[J].Biochimica et Biophysica Acta (BBA):Proteins and Proteomics,2005,1751(2):119-139.
[4] 张永元,罗李娜,张中月.十字结构银纳米线的表面等离极化激元分束特性[J].物理学报,2015,64(9):97303-097303.
[5] PLUM E,ZHOU J,DONG J,et al.Metamaterial with negative index due to chirality[J].Physical Review B,2009,79(3):035407.
[6] PENDRY J B.Negative refraction makes a perfect lens[J].Physical Review Letters,2000,85(18):3966.
[7] MA W,KUANG H,XU L,et al.Attomolar DNA detection with chiral nanorod assemblies[J].Nature Communications,2013,4:2689.
[8] MOCHIDA Y,CABRAL H,MIURA Y,et al.Bundled assembly of helical nanostructures in polymeric micelles loaded with platinum drugs enhancing therapeutic efficiency against pancreatic tumor[J].ACS Nano,2014,8(7):6724-6738.
[9] ZHU F,LI X,LI Y,et al.Enantioselective circular dichroism sensing of cysteine and glutathione with gold nanorods[J].Analytical Chemistry,2014,87(1):357-361.
[10] HUANG W,ZHANG Y,TANG X,et al.Optical properties of a planar metamaterial with chiral symmetry breaking[J].Optics Letters,2011,36(17):3359-3361.
[11] ESPOSITO M,TASCO V,TODISCO F,et al.Tailoring chiro-optical effects by helical nanowire arrangement[J].Nanoscale,2015,7(43):18081-18088.
[12] QU Y,TIAN X,FU T,et al.Broadband extraordinary optical transmission through a multilayer structure with a periodic nanoslit array[J].IEEE Photonics Journal,2015,7(3):1-8.
[13] QU Y,HUANG L S,WANG L,et al.Giant circular dichroism induced by tunable resonance in twisted Z-shaped nanostructure[J].Optics Express,2017,25(5):5480-5487.
[14] WANG Y K,WEN X J,QU Y,et al.Co-occurrence of circular dichroism and asymmetric transmission in twist nanoslit-nanorod arrays[J].Optics Express,2016,24(15):16425-16433.
[15] LIANG Y P,DING X,CHEN Y Q,et al.Application of scaled boundary finite element method in electromagnetic field problems[J].Chinese Journal of Computational Physics,2017,34(2):205-213.
[16] YE Z B,ZHOU H J.High-order discontinuous Galerkin time-domain finite-element method for three-dimensional cavities[J].Chinese Journal of Computational Physics,2015,32(4):449-454.
[17] JOHNSON P B,CHRISTY R W.Optical constants of the noble metals[J].Physical Review B,1972,6(12):4370.
[18] YIN X,SCHAFERLING M,METZGER B,et al.Interpreting chiral nanophotonic spectra:The plasmonic Born-Kuhn model[J].Nano Letters,2013,13(12):6238-6243.
[19] YIN H F,ZENG C H.Plasmon resonances in sodium clusters with triangle structure[J].Chinese Journal of Computational Physics,2014,31(6):713-718.