双蝶形金属纳米光天线的远场特性研究
|
摘要
为了提高对远场方向性调控的灵活性,提出双蝶形银纳米光天线,基于时域有限差分的方法研究了天线不同结构与尺寸的变化对远场方向性产生的影响。研究发现,由于局域表面等离激元的存在,偶极子源垂直放置于双蝶形银结构下表面一定距离时,远场方向图出现明显的旁瓣。天线长度的增加是方向图出现旁瓣的关键因素。天线臂之间夹缝的减小,使远场方向图中旁瓣增大,同时主瓣增益增大。天线厚度的增加使远场方向图出现旁瓣,主瓣增益先增大后减小。结果表明,双蝶形银纳米光天线能够改变与其相耦合的偶极子源的辐射方向性。
In order to improve the flexibility of the control to far-field directivity, the double butterfly-shap silver nanostructure optical antenna is put forword. The influence of the far-field directivity caused by different structures and sizes is researched based on finite difference time domain method. The research demonstrates that, because of the exist of localized surface plasmon, far-field pattern shows a significant side lobe when the dipole is placed beneath the structure vertically. The increase of length is the key factory to make the side lobe appears in the farfiled pattern. The decrease of the gap between antenna arms can make the side lobe and the main lobe gain increase in the far-field pattern. The increase in antenna thickness causes a side lobe in the far-field pattern and the main lobe gain first increases then decreases. The results show that double butterfly-shap silver nano optical antenna can change the radiation directivity of the coupling dipole source.
In order to improve the flexibility of the control to far-field directivity, the double butterfly-shap silver nanostructure optical antenna is put forword. The influence of the far-field directivity caused by different structures and sizes is researched based on finite difference time domain method. The research demonstrates that, because of the exist of localized surface plasmon, far-field pattern shows a significant side lobe when the dipole is placed beneath the structure vertically. The increase of length is the key factory to make the side lobe appears in the farfiled pattern. The decrease of the gap between antenna arms can make the side lobe and the main lobe gain increase in the far-field pattern. The increase in antenna thickness causes a side lobe in the far-field pattern and the main lobe gain first increases then decreases. The results show that double butterfly-shap silver nano optical antenna can change the radiation directivity of the coupling dipole source.
引文
1 Y C Lin,Y C Jian,J H Jiang.A study on the wet etching behavior of AZO(Zn O:Al)transparent conducting film[J].Appl Surf Sci,2008,254(9):2671-2677.
2 Chen Yuegang,Liu Guangqun.Simulation investigation of optical wave enhanced transmission through a subwavelength hole on metal film by using nano-antenna[J].Laser&Optoelectronics Progress,2012,49(9):091601.陈跃刚,刘广群.纳米天线增强光波透过金属薄膜上亚波长小孔的模拟研究[J].激光与光电子学进展,2012,49(9):091601.
3 K B Crozier.Optical antennas:Resonators for local field enhancement[J].J Appl Phys,2003,94(7):4632-4642.
4 R Ding,H Dai,M Li,et al..The application of localized surface plasmons resonance in Ag nanoparticles assisted Si chemical etching[J].Appl Phys Lett,2014,104(1):011602.
5 Li Zhiyuan,Li Jiafang.Recent progress in engineering and application of surface plasmon resonance in metal nanostructures[J].China Science Bullentin,2011,56(32):2631-2661.李志远,李家方.金属纳米结构表面等离子体共振的调控和利用[J].科学通报,2011,56(32):2631-2661.
6 F Jackel,A A Kinkhabwala,W E Moerner.Gold bowtie nanoantennas for surface-enhanced Raman scattering under controlled electrochemical potential[J].Chemical Physics Letters,2007,446(4):339-343.
7 Jiang Shuangfeng.Study of Nanometer Metal Optical Antenna Far-Field Characteristics[D].Jinan:Shandong University,2011.蒋双凤.纳米金属光天线远场特性的研究[D].济南:山东大学,2011.
8 Li Hongguang.Far-field characteristics of silver nanodisk optical antenna[J].Acta Photonica Sinica,2012,41(8):977-981.李宏光.银纳米圆盘光天线的远场方向性研究[J].光子学报,2012,41(8):977-981.
9 P B Johnson,R W Christy.Optical constants of the noble metals[J].Phys Rev B,1972,6(12):4370-4379.
10 A Mohammadi,V Sandoghdar,M Agio.Gold nanorods and nanospheroids for enhancing spontaneous emission[J].New Journal of Physics,2008,10(10):105015.
11 S T Chu,S K Chaudhuri.A finite-difference time-domain method for the design and analysis of guided-wave optical structures[J].J Lightwave Technol,1989,7(12):2033-2038.
12 H Xie,F M Kong,K Li.The electric field enhancement and resonance in optical antenna composed of Au nanoparicles[J].J Electromagnet Wave,2009,23(4):534-547.
13 Jiang Shuangfeng,Kong Fanmin,Li Kang,et al..Study of far-field directivity of optical dipole antenna[J].Acta Physica Sinica,2011,60(4):045103.蒋双凤,孔凡敏,李康,等.光偶极天线的远场方向性研究[J].物理学报,2011,60(4):045103.
14 Y Lin,K Li,F Kong,et al..Comprehensive numeric study of gallium nitride light-emitting diodes adopting surface-plasmonmediated light emission technique[J].IEEE Journal of Selected Topics in Quantum Electronics,2011,17(4):942-951.
15 D Dregely,R Taubert,J Dorfmüller,et al..3D optical Yagi-Uda nanoantenna array[J].Nature Communications,2011,2:267
2 Chen Yuegang,Liu Guangqun.Simulation investigation of optical wave enhanced transmission through a subwavelength hole on metal film by using nano-antenna[J].Laser&Optoelectronics Progress,2012,49(9):091601.陈跃刚,刘广群.纳米天线增强光波透过金属薄膜上亚波长小孔的模拟研究[J].激光与光电子学进展,2012,49(9):091601.
3 K B Crozier.Optical antennas:Resonators for local field enhancement[J].J Appl Phys,2003,94(7):4632-4642.
4 R Ding,H Dai,M Li,et al..The application of localized surface plasmons resonance in Ag nanoparticles assisted Si chemical etching[J].Appl Phys Lett,2014,104(1):011602.
5 Li Zhiyuan,Li Jiafang.Recent progress in engineering and application of surface plasmon resonance in metal nanostructures[J].China Science Bullentin,2011,56(32):2631-2661.李志远,李家方.金属纳米结构表面等离子体共振的调控和利用[J].科学通报,2011,56(32):2631-2661.
6 F Jackel,A A Kinkhabwala,W E Moerner.Gold bowtie nanoantennas for surface-enhanced Raman scattering under controlled electrochemical potential[J].Chemical Physics Letters,2007,446(4):339-343.
7 Jiang Shuangfeng.Study of Nanometer Metal Optical Antenna Far-Field Characteristics[D].Jinan:Shandong University,2011.蒋双凤.纳米金属光天线远场特性的研究[D].济南:山东大学,2011.
8 Li Hongguang.Far-field characteristics of silver nanodisk optical antenna[J].Acta Photonica Sinica,2012,41(8):977-981.李宏光.银纳米圆盘光天线的远场方向性研究[J].光子学报,2012,41(8):977-981.
9 P B Johnson,R W Christy.Optical constants of the noble metals[J].Phys Rev B,1972,6(12):4370-4379.
10 A Mohammadi,V Sandoghdar,M Agio.Gold nanorods and nanospheroids for enhancing spontaneous emission[J].New Journal of Physics,2008,10(10):105015.
11 S T Chu,S K Chaudhuri.A finite-difference time-domain method for the design and analysis of guided-wave optical structures[J].J Lightwave Technol,1989,7(12):2033-2038.
12 H Xie,F M Kong,K Li.The electric field enhancement and resonance in optical antenna composed of Au nanoparicles[J].J Electromagnet Wave,2009,23(4):534-547.
13 Jiang Shuangfeng,Kong Fanmin,Li Kang,et al..Study of far-field directivity of optical dipole antenna[J].Acta Physica Sinica,2011,60(4):045103.蒋双凤,孔凡敏,李康,等.光偶极天线的远场方向性研究[J].物理学报,2011,60(4):045103.
14 Y Lin,K Li,F Kong,et al..Comprehensive numeric study of gallium nitride light-emitting diodes adopting surface-plasmonmediated light emission technique[J].IEEE Journal of Selected Topics in Quantum Electronics,2011,17(4):942-951.
15 D Dregely,R Taubert,J Dorfmüller,et al..3D optical Yagi-Uda nanoantenna array[J].Nature Communications,2011,2:267