Broadband localized electric field enhancement produced by a single-element plasmonic nanoantenna

Yong, Zhengdong; Gong, Chensheng; Dong, Yongjiang; Zhang, Senlin; He, Sailing

doi:10.1039/c6ra26703c

Cited by 12 publications

(3 citation statements)

References 46 publications

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“…More recently nanostructures rationally designed using antenna theory such as the bowtie structure and modified-ring structure have also been proposed to provide broadband SEF. [118,119] These structures produce multiple resonances that combine to broaden the enhancement response and allow the potential for a spectral bandwidth of up to 1000 nm, but have yet to be verified in SEF experiments. In relation to the recent interest in non-metal-based plasmonics (discussed in Section 4), ZnO nanostructures have been demonstrated to exhibit a strong broadband SEF effect.…”

Section: Surface Enhanced Fluorescence (Sef)mentioning

confidence: 99%

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Farid

Dixon

Shayegannia

et al. 2021

Advanced Optical Materials

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Surface plasmon polaritons (SPPs) which exist at the metal-dielectric interface are guided by the coupling of electromagnetic waves to oscillations in the electron gas plasma created at metal surfaces. Plasmonics, a subset of the field of nanophotonics pertaining to all things beyond the diffraction limit, has flourished and evolved significantly over the past decade offering practical utility to a variety of applications. [1] Notwithstanding the ohmic loss in metals and commensurate limited propagation lengths of SPPs, the ability to effectively concentrate light in nanoscale volumes and generate extremely high electric field intensities at discontinuities or subwavelength patterned surfaces offers unique opportunities to enhance lightmatter interactions for a diverse range of functionalities. [2] Trapping broadband electromagnetic radiation over a range of deep subwavelength guided modes in a given structure provides opportunities for light-matter interactions at the nanoscale. Use of materials-commonly metals-that exhibit negative dielectric permittivity (ε < 0) at optical frequencies provide an optimum solution for light localization. Nanometallic light concentrators, in contrast to their dielectric counterparts, can squeeze and localize light into subwavelength volumes with greater control and higher efficiency. [3] Such plasmonic light concentration can be achieved by either resonant or non-resonant structures. In resonant structures, SPPs are created by time-varying electric fields that exert a force on the negatively charged electron gas inside a metal. These oscillations are resonantly driven leading to a strong charge displacement at specific optical frequencies and concentration of the light field within the structures. [4] For non-resonant light concentration effects, Schuller et al. demonstrated subwavelength light localization by introducing a feed gap in the metal structure for retardation-based resonators. The gap builds up opposite charges across it whereby SPPs encounter a longitudinal electric field component causing strong sub-wavelength light localization. [2] The focus of this article is plasmonic devices that enable rainbow light trapping, a specific modality of nanoscale field enhancement in which trapped light is spatially separated This article presents recent advances in plasmonic multiwavelength rainbow light trapping, a field that has evolved over the last decade and today is an active area of research interest encompassing a manifold of potential applications which include optical biosensing, photodetection, spectroscopy, and medicine. Conventional plasmonic devices are designed and optimized to enhance optical performance at single wavelengths, and as such are not suitable for applications that require electromagnetic field localization at multiple frequencies or broad frequency ranges of interest. To overcome these limitations, the ability to slow and trap light at multiple wavelengths and at different spatial locations has attracted significant scientific attention and opened up n...

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Section: Surface Enhanced Fluorescence (Sef)mentioning

confidence: 99%

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Farid

Dixon

Shayegannia

et al. 2021

Advanced Optical Materials

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“…For example, antennas used to improve energy harvesting efficiency of photovoltaic devices. Broadband PNAs are also highly wanted for SERs, fluorescence enhancement, and higher harmonic generation, which are multi-wavelength and broadband in nature [13].…”

Section: Plasmonics Nano-antennamentioning

confidence: 99%

Plasmonic Optical Nano-Antenna for Biomedical Applications

Mahdi¹,

Jawad²

2023

Plasmonic Nanostructures - Basic Concepts, Optimization and Applications

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Plasmonics attract significant attention of the researchers due to Plasmon’s surpassing ability to match free space electromagnetic (EM) excitation into the nano-scale size and conduct the light-tissue interaction in this scale. Plasmonic nano-antennas (PNAs) is a coupling of EM waves into Localized Surface Plasmon Resonance (LSPR) which is considered as an interesting subject for theoretical and experimental study. This presents a new concept of the confinement of light in subwavelength scales with huge local fields which can generate very high near field intensities because of their LSPR. The generated field is invested in various applications that are depending on near field enhancement produced by plasmonic optical nano-antennas (PONAs) such as Surface-Enhanced Raman Spectroscopy (SERS), biosensing, spectral imaging and cancer treatment. Bowtie shape PNAs (PBNAs) can transfer the light field efficiently by converting the light from external space into a subwavelength spectral region with the improvement at an optical wavelength in a tiny area between its antenna arms. The local EM field production in a gap area is the main reason to suggest PBNAs shape if the frequency of the incident EM waves coincide the structural resonance peak so it is acting as a tunable hot spot.

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“…Optical antennas are required to support the broadband operation for a variety of applications. Optical broadband antennas are also exceedingly desirable for fluorescence enhancement, surface-enhanced Raman scattering, and higher harmonic generation, which are intrinsically multi-wavelength and broadband in nature [33]. However, broadband antennas operating in optical frequencies experience limitations such as low radiation efficiency or narrow frequency band operation, etc.…”

Section: Introductionmentioning

confidence: 99%

Maple-Leaf Shaped Broadband Optical Nano-Antenna with Hybrid Plasmonic Feed for Nano-Photonic Applications

et al. 2021

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This article presents a broadband optical nano-antenna, which covers a broader range of optical communication wavelengths (666 to 6000 nm), used in nano-photonic applications. The proposed design is modeled and analyzed to obtain a satisfactory gain of up to 11.4 dBi for a single element-based antenna. The unique feature of the proposed antenna is the hybrid plasmonic waveguide-based feed, which receives the optical signal from the planar waveguide and redirects the signal out of the plane. The proposed antenna provides highly directional radiation properties, which makes it a suitable candidate for inter- and intra-chip optical communications and sensing applications. Moreover, an extension of the work is performed for an array configuration of the order 2 × 1 and 64 × 1, to increase the gain and directionality. Therefore, this shows that it can be equally useful for optical energy harvesting applications with a significant gain up to 26.8 dBi.

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Broadband localized electric field enhancement produced by a single-element plasmonic nanoantenna

Abstract: We propose a novel design of a broadband plasmonic nanoantenna, investigate it numerically using finite-difference time-domain methods, and explain its performance using the analysis of charge distribution in addition to a multipole expansion.

Cited by 12 publications

References 46 publications

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Plasmonic Optical Nano-Antenna for Biomedical Applications

Maple-Leaf Shaped Broadband Optical Nano-Antenna with Hybrid Plasmonic Feed for Nano-Photonic Applications

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