Fano resonance in asymmetric gold nano-dimers with square and rectangular sections |
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| Institution: | 1. College of Electrical and Information Engineering, Hunan University, Lushan South Road, Changsha, 410082, Hunan, PR China;2. National Engineering Laboratory for Robot Visual Perception and Control Technology, Hunan University, Lushan South Road, Changsha, 410082, Hunan, PR China;3. School of Physics and Electronics Science, Hunan University of Science and Technology, Taoyuan Road, Xiangtan, 411201, Hunan, PR China;4. Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI. USA;1. College of Electrical Engineering and Automation, Anhui University, Hefei, Anhui 230601, PR China;2. National Engineering Laboratory of Energy-Saving Motor and Control Technology, Anhui University, Hefei, Anhui 230601, PR China;3. Hefei Comprehensive Education Technology Co., Ltd., Hefei, Anhui 230088, PR China;1. Laboratoire synthèse et Catalyse, Ibn Khaldoun Université de Tiaret, Postbox78-Zaaroura, Tiaret 14000, Algeria;2. Laboratoire de Physique Quantique et de Modélisation Mathématique (LPQ3M), Algeria;3. Département de Technologie, Université de Mascara, Mascara 29000, Algeria;4. Yüzüncü Yıl University, Faculty of Education, Department of Physics, Van 65080, Turkey;5. Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia |
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| Abstract: | The Fano resonances of the asymmetric dimers of gold nanowires with square and rectangular sections are investigated by using the finite-difference time-domain (FDTD) method. It is found that the Fano resonance peak can be switched on and off by laying or removing the rectangular section nanowire aside the square section one. There is only one dipole resonance mode of a single gold nanowire with a square section on the dielectric substrate, and it redshifts obviously accompanied with the FWHM being broadened along with the side width of the nanowire increasing. A Fano resonance appears when another gold nanowire with the rectangular section is laid aside the one with a square section. The peak value and FWHM of the Fano resonance mode increase obviously with the distance between the two nanowires getting larger. Meanwhile, it can be modulated by the height of the rectangular section nanowire. In addition, they can be regulated by the width and rotating angle of the rectangular section nanowire, but the peak value stays the same. The mechanisms for these behaviors are associated with the interaction of the superradiant and subradiant modes, and the corresponding electric field distributions are plotted to verify this. It is expected that the results will be useful for the design of wavelength biosensing and other new optical devices. |
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