基于局域表面等离子体共振的近场偏振测量
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摘要
在近场条件下金纳米粒子能引起光场矢量局部变化,针对金纳米粒子的这一特性,提出了一种检测近场光偏振态的新方法。将半径为50 nm的金纳米小球组成金纳米粒子阵列结构,利用该结构产生一定的光强分布图案,用于检测不同偏振态的光场矢量。利用数值模拟软件FDTD对金纳米粒子阵列结构进行模拟仿真,结果表明,从仿真图案上可以直观地分辨出5种不同偏振态的光场。
Due to the local variations of the electric-field vector caused by a single gold nanoparticle in the near-field, a new method of detecting near-field polarization states is proposed.A gold nanoparticle array with a radius of 50 nm is designed to detect the electric-field vector of different polarization. The gold nanoparticle causes local changes of the electric field vector and produces certain intensity patterns to detect the electric vectors of different polarization states. In this paper, the measurement results of five different polarization states have been mapped by FDTD, which can be distinguished visually and also relative to the different polarization properties.
Due to the local variations of the electric-field vector caused by a single gold nanoparticle in the near-field, a new method of detecting near-field polarization states is proposed.A gold nanoparticle array with a radius of 50 nm is designed to detect the electric-field vector of different polarization. The gold nanoparticle causes local changes of the electric field vector and produces certain intensity patterns to detect the electric vectors of different polarization states. In this paper, the measurement results of five different polarization states have been mapped by FDTD, which can be distinguished visually and also relative to the different polarization properties.
引文
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[2]BETZIG E,CHICHESTER R J.Single molecules observed by near-field scanning optical microscopy[J].Science,1993,262(5138):1422-1425.
[3]PENDRY J B.Negative refraction makes a perfect lens[J].Physical Review Letters,2000,85(18):3966-3969.
[4]SHELBY R A,SMITH D R,SCHULTZ S.Experimental verification of a negative index of refraction[J].Science,2001,292(5514):77-79.
[5]FANG N,LEE H,SUN C,et al.Sub-diffraction-limited optical imaging with a silver superlens[J].Science,2005,308(5721):534-537.
[6]GRIGORENKO A N,GEIM A K,GLEESON H F,et al.Nanofabricated media with negative permeability at visible frequencies[J].Nature,2005,438(7066):335-338.
[7]NODA S,CHUTINAN A,IMADA M.Trapping and emission of photons by a single defect in a photonic bandgap structure[J].Nature,2000,407(6804):608-610.
[8]GARCíA-VIDAL F J,MARTíN-MORENO L.Transmission and focusing of light in one-dimensional periodically nanostructured metals[J].Physical Review B,2002,66(15):155412.
[9]HIBBINS A P,EVANS B R,SAMBLES J R.Experimental verification of designer surface plasmons[J].Science,2005,308(5722):670-672.
[10]HAO B,LEGER J.Experimental measurement of longitudinal component in the vicinity of focused radially polarized beam[J].Optics Express,2007,15(6):3550-3556.
[11]LEE K G,KIHM H W,KIHM J E,et al.Vector field microscopic imaging of light[J].Nature Photonics,2007,1(1):53-56.
[12]刘丽彦.金属纳米球阵列的电磁增强机理研究[D].天津:南开大学,2008.
[13]BOUHELIER A,BEVERSLUIS M R,NOVOTNY L.Near-field scattering of longitudinal fields[J].Applied Physics Letters,2003,82(25):4596-4598.
[14]WANG H,SHEPPARD C J R,RAVI K,et al.Fighting against diffraction:apodization and near field diffraction structures[J].Laser&Photonics Reviews,2012,6(3):354-392.
[15]WANG H F,SHI L P,LUKYANCHUK B,et al.Creation of a needle of longitudinally polarized light in vacuum using binary optics[J].Nature Photonics,2008,2(8):501-505.