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Validity of classical coupled oscillators model for elucidating surface plasmon effects on optical scattering by silver nanocylinders
Widiasari F.R.a, Iskandar A.A.a, Tjia M.-O.a
a Physics of Magnetism and Photonics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2016 World Scientific Publishing Company.A study is conducted to examine the possibility of explaining the spectral features TE wave scattered by a single and two silver nanocylinders on the basis of a classical coupled oscillators model. The two oscillators representing the nanocylinder are specified by separate eigen frequencies and damping factors with a coupling constant between them, while the influences of the incoming wave on the oscillators are represented by separate driving forces. The validity of the model is examined by the quality of fitting and its resulted spectral profiles with those calculated from the exact formulation of Mie theory. In the case of a single nanocylinder, excellent fit of R2 ≥ 0.99 is found for cylinder radius ranging from 20nm to 40nm. The best fitted parameters show that the so-called dark oscillator has a narrow spectral profile representing the contribution of surface plasmon resonance while the other so-called bright oscillator has a broad spectral profile that can be associated with the contribution of the slowly-varying scattered background. For scattering by two nanocylinders with separation ℓ, excellent fits are also obtained for wide range of ℓ from 15nm to 100nm by introducing Lorentzian-like dispersive coupling between the dark oscillators for both incident light normal and along the axis connecting the cylinders. This study has thus demonstrated the roles of surface plasmon and the plasmonic interactions for the appearance of Fano-like asymmetric cross-section profile.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Asymmetric cross section,Coupled oscillators,Coupling constants,Fano resonances,Nanocylinders,Plasmonic coupling,Plasmonic interactions,Surface plasmon effects[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]classical model of coupled oscillators,Fano resonance,plasmonic coupling,silver nanocylinder,Surface plasmon resonance[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1142/S0218863516500065[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]