Near-field asymmetries in plasmonic resonators

Nanoscale ◽  
2015 ◽  
Vol 7 (8) ◽  
pp. 3634-3644 ◽  
Author(s):  
Vladimir Aksyuk ◽  
Basudev Lahiri ◽  
Glenn Holland ◽  
Andrea Centrone
Keyword(s):  
Symmetry Breaking ◽  
Near Field ◽  
Dark Mode ◽  
Magnetic Excitations

PTIR reveals symmetry-breaking near-field SEIRA enhancements caused by the interference between electric and magnetic excitations of the resonators’ dark-mode.

scholarly journals All-dielectric chiral-field-enhanced Raman optical activity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ting-Hui Xiao ◽  
Zhenzhou Cheng ◽  
Zhenyi Luo ◽  
Akihiro Isozaki ◽  
Kotaro Hiramatsu ◽  
...  
Keyword(s):  
Optical Activity ◽  
Metallic Nanoparticles ◽  
Near Field ◽  
Localized Surface Plasmon ◽  
Chiral Field ◽  
Resonance Spectroscopy ◽  
Conformational Structure ◽  
Dark Mode ◽  
Spontaneous Raman Scattering ◽  
Raman Optical Activity

AbstractRaman optical activity (ROA) is effective for studying the conformational structure and behavior of chiral molecules in aqueous solutions and is advantageous over X-ray crystallography and nuclear magnetic resonance spectroscopy in sample preparation and cost performance. However, ROA signals are inherently minuscule; 3–5 orders of magnitude weaker than spontaneous Raman scattering due to the weak chiral light–matter interaction. Localized surface plasmon resonance on metallic nanoparticles has been employed to enhance ROA signals, but suffers from detrimental spectral artifacts due to its photothermal heat generation and inability to efficiently transfer and enhance optical chirality from the far field to the near field. Here we demonstrate all-dielectric chiral-field-enhanced ROA by devising a silicon nanodisk array and exploiting its dark mode to overcome these limitations. Specifically, we use it with pairs of chemical and biological enantiomers to show >100x enhanced chiral light–molecule interaction with negligible artifacts for ROA measurements.

Imaging of Magnetic Excitations in Nanostructures with Near-Field Microwave Microscopy

2021 ◽  
pp. 168870
Author(s):  
Samuel Berweger ◽  
Robert Tyrell-Ead ◽  
Houchen Chang ◽  
Mingzhong Wu ◽  
Na Zhu ◽  
...  
Keyword(s):  
Near Field ◽  
Magnetic Excitations ◽  
Microwave Microscopy

scholarly journals Asymmetric excitation of surface plasmons by dark mode coupling

2016 ◽  
Vol 2 (2) ◽  
pp. e1501142 ◽  
Author(s):  
Xueqian Zhang ◽  
Quan Xu ◽  
Quan Li ◽  
Yuehong Xu ◽  
Jianqiang Gu ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Mode Coupling ◽  
Electromagnetic Waves ◽  
Electromagnetically Induced Transparency ◽  
Near Field ◽  
Coupling Mechanism ◽  
Dark Mode ◽  
Resolution Imaging ◽  
Experimental Findings ◽  
Induced Transparency

Control over surface plasmons (SPs) is essential in a variety of cutting-edge applications, such as highly integrated photonic signal processing systems, deep-subwavelength lasing, high-resolution imaging, and ultrasensitive biomedical detection. Recently, asymmetric excitation of SPs has attracted enormous interest. In free space, the analog of electromagnetically induced transparency (EIT) in metamaterials has been widely investigated to uniquely manipulate the electromagnetic waves. In the near field, we show that the dark mode coupling mechanism of the classical EIT effect enables an exotic and straightforward excitation of SPs in a metasurface system. This leads to not only resonant excitation of asymmetric SPs but also controllable exotic SP focusing by the use of the Huygens-Fresnel principle. Our experimental findings manifest the potential of developing plasmonic metadevices with unique functionalities.

Influence of symmetry breaking in pentamers on Fano resonance and near-field energy localization

2011 ◽  
Vol 1 (8) ◽  
pp. 1409 ◽  
Author(s):  
M. Rahmani ◽  
B. Lukiyanchuk ◽  
T. T. V. Nguyen ◽  
T. Tahmasebi ◽  
Y. Lin ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Fano Resonance ◽  
Near Field ◽  
Field Energy ◽  
Energy Localization

scholarly journals Dynamically Tunable Resonant Strength in Electromagnetically Induced Transparency (EIT) Analogue by Hybrid Metal-Graphene Metamaterials

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 171 ◽  
Author(s):  
Chaode Lao ◽  
Yaoyao Liang ◽  
Xianjun Wang ◽  
Haihua Fan ◽  
Faqiang Wang ◽  
...  
Keyword(s):  
Optical Networks ◽  
Electromagnetically Induced Transparency ◽  
Near Field ◽  
Monolayer Graphene ◽  
Dark Mode ◽  
Resonance Strength ◽  
Field Coupling ◽  
Terahertz Communications ◽  
Unit Cells ◽  
Induced Transparency

In this paper, a novel method to realize a dynamically tunable analogue of EIT for the resonance strength rather than the resonance frequency is proposed in the terahertz spectrum. The introduced method is composed of a metal EIT-like structure, in which a distinct EIT phenomenon resulting from the near field coupling between bright and dark mode resonators can be obtained, as well as an integrated monolayer graphene ribbon under the dark mode resonator that can continuously adjust the resonance strength of transparency peak by changing the Fermi level of the graphene. Comparing structures that need to be modulated individually for each unit cell of the metamaterials, the proposed modulation mechanism was convenient for achieving synchronous operations for all unit cells. This work demonstrates a new platform of modulating the EIT analogue and paves the way to design terahertz functional devices which meet the needs of optical networks and terahertz communications.

scholarly journals Experimental Demonstration of Electromagnetically Induced Transparency in a Conductively Coupled Flexible Metamaterial with Cheap Aluminum Foil

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Jie Hu ◽  
Tingting Lang ◽  
Weihang Xu ◽  
Jianjun Liu ◽  
Zhi Hong
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Near Field ◽  
Surface Current ◽  
Aluminum Foil ◽  
Ring Resonators ◽  
Dark Mode ◽  
Field Coupling ◽  
New Ideas ◽  
Induced Transparency ◽  
Bright Mode

AbstractWe propose a conductively coupled terahertz metallic metamaterial exhibiting analog of electromagnetically induced transparency (EIT), in which the bright and dark mode antennae interact via surface currents rather than near-field coupling. Aluminum foil, which is very cheap and often used in food package, is used to fabricate our metamaterials. Thus, our metamaterials are also flexible metamaterials. In our design, aluminum bar resonators and aluminum split ring resonators (SRRs) are connected (rather than separated) in the form of a fork-shaped structure. We conduct a numerical simulation and an experiment to analyze the mechanism of the proposed metamaterial. The surface current due to LSP resonance (bright mode) flows along different paths, and a potential difference is generated at the split gaps of the SRRs. Thus, an LC resonance (dark mode) is induced, and the bright mode is suppressed, resulting in EIT. The EIT-like phenomenon exhibited by the metamaterial is induced by surface conducting currents, which may provide new ideas for the design of EIT metamaterials. Moreover, the process of fabricating microstructures on flexible substrates can provide a reference for producing flexible microstructures in the future.

BURIED PLANAR WAVEGUIDE IN KTiOPO4 FORMED BY Cs+ ION EXCHANGE AND Si+ ION IMPLANTATION

2008 ◽  
Vol 22 (10) ◽  
pp. 755-762 ◽  
Author(s):  
RUIFENG ZHANG ◽  
FEI LU ◽  
JIE LIAN ◽  
XIANGZHI LIU ◽  
HANPING LIU ◽  
...  
Keyword(s):  
Refractive Index ◽  
Ion Exchange ◽  
Ion Implantation ◽  
Planar Waveguide ◽  
Near Field ◽  
Refractive Index Profile ◽  
Coupling Method ◽  
Dark Mode ◽  
Field Patterns ◽  
Transport Of Ions

Buried planar waveguide was produced by Cs +– K + ion exchange and Si + ion implantation in z-cut KTiOPO 4 (KTP) single domain crystals. The dark mode spectra of the waveguide were obtained by the prism-coupling method. The refractive index profiles of the Cs +– K + ion exchanged sample were reconstructed using the inverse Wenzel–Kramers–Brillouin (iWKB) method and the analysis of the refractive index profile has shown an exponential distribution in the exchange layer. The Si + ions implanted into the Cs +– K + exchange sample with the energy of 550 keV at a dose of 1.0×1015 ions/cm2 at room temperature to form a buried planar waveguide structure. The program code TRIM'98 (transport of ions in matter) is used to simulate the implantation process. The near field patterns of propagation light in buried waveguide was studied by the end-coupling method.

Spontaneous Symmetry Breaking Based Near-Field Sensing with a Microresonator

2019 ◽  
Author(s):  
Andreas Ø. Svela ◽  
Jonathan M. Silver ◽  
Leonardo Del Bino ◽  
George Ghalanos ◽  
Niall Moroney ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Near Field ◽  
Field Sensing

scholarly journals Probing the transition from an uncoupled to a strong near-field coupled regime between bright and dark mode resonators in metasurfaces

2014 ◽  
Vol 105 (8) ◽  
pp. 081108 ◽  
Author(s):  
Ranjan Singh ◽  
Ibraheem Al-Naib ◽  
Dibakar Roy Chowdhury ◽  
Longqing Cong ◽  
Carsten Rockstuhl ◽  
...  
Keyword(s):  
Near Field ◽  
Dark Mode
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