Near-Field Imaging and Time-Domain Dynamics of Photonic Topological Edge States in Plasmonic Nanochains

Yan, Qiuchen; Cao, En; Sun, Quan; Ao, Yutian; Hu, Xiaoyong; Shi, Xu; Gong, Qihuang; Misawa, Hiroaki

doi:10.1021/acs.nanolett.1c03324

Cited by 29 publications

(16 citation statements)

References 37 publications

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“…Notably, the low symmetry of the SRR unit cell along the scan direction is also evident in a spatial shift of the spectral intensity minimum at 1.8 THz by about 7 μm toward the gap side of the split-ring resonator, resulting in staggered configuration and a slight difference between the left and right edge state. In future studies, the relationship between properties of the emitted THz radiation and the topological character of the photonic edge state , could be of particular interest.…”

Section: Resultsmentioning

confidence: 99%

Coupling Broadband Terahertz Dipoles to Microscale Resonators

Rathje,

von Seggern,

Gräper

et al. 2023

ACS Photonics

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Optically driven spintronic emitters are a unique class of terahertz (THz) sources due to their quasi-two-dimensional geometry and thereby their capability to effectively couple to resonator near fields. Global excitation of the emitters often obstructs the intricate details of the coupling mechanisms between local THz dipoles and the individual modes of resonator structures. Here, we demonstrate the spatial mapping of the coupling strength between a micrometer-scale terahertz source on a spintronic emitter and far-field light mediated by a structured metallic environment. For a bow-tie geometry, experimental results are reproduced by a numerical model, providing insights into the microscopic coupling mechanisms. The broad applicability of the technique is showcased by extracting the THz mode structure in split-ring resonator metasurfaces and linear arrays. With these developments, planar THz sources with tailored spectral and angular emission profiles become accessible.

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Section: Resultsmentioning

confidence: 99%

Coupling Broadband Terahertz Dipoles to Microscale Resonators

Rathje,

von Seggern,

Gräper

et al. 2023

ACS Photonics

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“…Plasmonic nanoparticle chain edge states are difficult to observe in experiments mainly due to the small dimension needed to avoid detrimental long-range effects. Despite these difficulties, they have been experimentally probed by near-field , and far-field imaging techniques.…”

Section: Switching Edge States By Incoming Electric Fieldmentioning

confidence: 99%

Exploiting Oriented Field Projectors to Open Topological Gaps in Plasmonic Nanoparticle Arrays

2023

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In the last years there have been multiple proposals in nanophotonics to mimic topological condensed matter systems. However, nanoparticles have degrees of freedom that atoms lack of, like dimensions or shape, which can be exploited to explore topology beyond electronics. Elongated nanoparticles can act like projectors of the electric field in the direction of the major axis. Then, by orienting them in an array the coupling between them can be tuned, allowing to open a gap in an otherwise gapless system. As a proof of the potential of the use of orientation of nanoparticles for topology, we study 1D chains of prolate spheroidal silver nanoparticles. We show that in these arrays spatial modulation of the polarization allows to open gaps, engineer hidden crystalline symmetries and to switch on/off or left/right edge states depending on the polarization of the incident electric field. This opens a path toward exploiting features of nanoparticles for topology to go beyond analogues of condensed matter systems.

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“…The study of edge states in topological photonic systems can give us crucial insights on the topological properties of these systems. However, plasmonic systems suffer large losses during nanoscale propagation, so a key focus in topological nanophotonics will be particle-like (or localized) states ,− such as corner states, which have tight confinement in all directions. ,,,− …”

Section: Topology In Photonicsmentioning

confidence: 99%

Advances and Prospects in Topological Nanoparticle Photonics

et al. 2022

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Topological nanophotonics is a new avenue for exploring nanoscale systems from visible to THz frequencies, with unprecedented control. By embracing their complexity and fully utilizing the properties that make them distinct from electronic systems, we aim to study new topological phenomena. In this Perspective, we summarize the current state of the field and highlight the use of nanoparticle systems for exploring topological phases beyond electronic analogues. We provide an overview of the tools needed to capture the radiative, retardative, and long-range properties of these systems. We discuss the application of dielectric and metallic nanoparticles in nonlinear systems and also provide an overview of the newly developed topic of topological insulator nanoparticles. We hope that a comprehensive understanding of topological nanoparticle photonic systems will allow us to exploit them to their full potential and explore new topological phenomena at very reduced dimensions.

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Near-Field Imaging and Time-Domain Dynamics of Photonic Topological Edge States in Plasmonic Nanochains

Cited by 29 publications

References 37 publications

Coupling Broadband Terahertz Dipoles to Microscale Resonators

Coupling Broadband Terahertz Dipoles to Microscale Resonators

Exploiting Oriented Field Projectors to Open Topological Gaps in Plasmonic Nanoparticle Arrays

Advances and Prospects in Topological Nanoparticle Photonics

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