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Stable Fano-like plasmonic resonance: its impact on the reversal of far-and near-field optical binding force

Communications in Theoretical Physics 2020年第4期72卷 89-105页

作者： hamim mahmud rivy M R C Mahdy Nabila Masud Ziaur Rahman Jony Saikat Chandra Das Department of Electrical&Computer Engineering North South UniversityBashundharaDhaka1229Bangladesh School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang Ave639798 Singapore Pi Labs Bangladesh LTD ARA Bhaban39Kazi Nazrul Islam AvenueKawran BazarDhaka 1215Bangladesh

Even for a 100 nm interparticle distance or a small change in particle shape,optical Fano-like plasmonic resonance mode usually vanishes *** would be remarkable if stable Fano-like resonance could somehow be achieved in distinctly shaped nanoparticles for more than 1μm interparticle distance,which corresponds to the far electromagnetic field *** such far-field Fano-like plasmonic resonance can be achieved,controlling the reversal of the far-field binding force can be attained,like the currently reported reversals for near-field *** this work,we have proposed an optical set-up to achieve such a robust and stable Fano-like plasmonic resonance,and comparatively studied its remarkable impact on controlling the reversal of near-and far-field optical binding *** our proposed set-up,the distinctly shaped plasmonic tetramers are half immersed(***-benzene)in an inhomogeneous dielectric interface and illuminated by?circular?polarized *** have demonstrated significant differences between near-and far-field optical binding forces along with the Lorentz force field,which partially depends on the object’s shape.A clear connection is shown between the far-field binding force and the resonant modes,along with a generic mechanism to achieve controllable Fano-like plasmonic resonance and the reversal of the optical binding force in both far-and near-field configurations.

关键词： Fano resonance optical binding force Lorentz force plasmonic tetramer

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Dielectric or plasmonic Mie object at air–liquid interface: The transferred and the traveling momenta of photon

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Chinese Physics B 2020年第1期29卷 311-323页

作者： M R C Mahdy hamim mahmud rivy Ziaur Rahman Jony Nabila Binte Alam Nabila Masud Golam Dastegir Al Quaderi Ibraheem Muhammad Moosa Chowdhury Mofizur Rahman M Sohel Rahman Department of Electrical&Computer Engineering North South UniversityBashundharaDhaka 1229Bangladesh Pi Labs Bangladesh LTD ARA Bhaban39Kazi Nazrul Islam AvenueKawran BazarDhaka 1215Bangladesh Department of Computer Science&Engineering Military Institute of Science and TechnologyDhakaBangladesh Department of Physics University of DhakaDhakaBangladesh Department of Computer Science&Engineering Bangladesh University of Engineering and Technology ECE BuildingWest PalasiDhaka-1205 Department of Computer Science&Engineering United International UniversityDhakaBangladesh

Considering the inhomogeneous or heterogeneous background, we have demonstrated that if the background and the half-immersed object are both non-absorbing, the transferred photon momentum to the pulled object can be considered as the one of Minkowski exactly at the interface. In contrast, the presence of loss inside matter, either in the half-immersed object or in the background, causes optical pushing of the object. Our analysis suggests that for half-immersed plasmonic or lossy dielectric, the transferred momentum of photon can mathematically be modeled as the type of Minkowski and also of Abraham. However, according to a final critical analysis, the idea of Abraham momentum transfer has been rejected. Hence,an obvious question arises: whence the Abraham momentum? It is demonstrated that though the transferred momentum to a half-immersed Mie object(lossy or lossless) can better be considered as the Minkowski momentum, Lorentz force analysis suggests that the momentum of a photon traveling through the continuous background, however, can be modeled as the type of Abraham. Finally, as an interesting sidewalk, a machine learning based system has been developed to predict the time-averaged force within a very short time avoiding time-consuming full wave simulation.

关键词： Abraham–Minkowski controversy dielectric interface machine learning optical force laws optical pulling force optical tractor beams

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