期刊
OPTICS EXPRESS
卷 23, 期 22, 页码 28801-28807出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.028808
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资金
- Danish Council for Independent Research (the FNU project) [12-124690]
- European Research Council (the PLAQ-NAP project) [341054]
- University of Southern Denmark (SDU 2020 funding)
- European Research Council (ERC) [341054] Funding Source: European Research Council (ERC)
Starting from a general description of light scattering by a nanoparticle in homogeneous surroundings and situated near a substrate, we outline the connection to multipole expansion of scattered light and derive conditions and limits on achievable half-space scattering asymmetry, including the possibility of unidirectional scattering along the propagation direction of the incident light (i.e., generalized Kerker conditions). As a way of realizing strongly asymmetric scattering, we perform a parametric study of the optical properties of disk-shaped gap-surface plasmon (GSP) resonators, consisting of a glass spacer sandwiched between two gold disks, with numerical calculations that corroborate the conditions derived from the multipole expansion. Finally, we present proof-of-principle experiments of asymmetric scattering by GSP-resonators on a glass substrate. (C) 2015 Optical Society of America
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