Optical characterization of epsilon-near-zero, epsilon-near-pole, and hyperbolic response in nanowire metamaterials

Starko‐Bowes, Ryan; Atkinson, Jonathan; Newman, Ward D.; Hu, Haifeng; Kallos, Themos; Palikaras, George; Fedosejevs, R.; Pramanik, Sandipan; Jacob, Zubin

doi:10.1364/josab.32.002074

Cited by 63 publications

(41 citation statements)

References 31 publications

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“…Moreover, inside the SNP regime, there are also two σ-nearzero (SNZ) regimes: exactly at ω 0 : Im σ ⊥ = 0 (SNZ for σ ⊥ ), but near ω 0 : Im σ Im σ ⊥ (SNZ for σ ). These SNZ regimes are also analogous to the ε-nearzero regime in 3D metamaterials [10,66,70,71]. Furthermore, here we will consider the configurations with the extrinsic chirality (see Sec.…”

Section: A Effective Conductivities and Operating Regimesmentioning

confidence: 97%

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Enhanced optical activity in hyperbolic metasurfaces

Kotov

Lozovik

2017

Phys. Rev. B

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The optical activity of achiral nonmagnetic uniaxial metasurfaces caused by the extrinsic chirality arising from the mutual orientation of their anisotropy axis and the light plane of incidence is studied. The hyperbolic regime of the metasurfaces manifests in the amplification of the polarization rotation in the transmitted light and in the giant enhancement of the effect in the reflected light. The transition to this regime is frequency dependent and has the topological nature. The key role in the optical activity enhancement belongs to the σ-near-pole and hyperbolic σ-near-zero regimes of the metasurfaces. The hyperbolic metasurfaces based on graphene strips or metal disks, and a black phosphorus thin film as a natural hyperbolic layer are considered. The efficiency of the predicted effects depends on the metasurfaces implementation and the role of a substrate. By varying the metasurface parameters and choosing the physical realizations it is possible to design such a hyperbolic metasurface polarizer for the THz, infrared, and visible working ranges. Our findings may help to improve metasurface polarizers by using them in the hyperbolic regime.

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Section: A Effective Conductivities and Operating Regimesmentioning

confidence: 97%

“…near ω 0 can be called the σ-near-pole regime (by analogy with the ε-near-pole regime in 3D metamaterials [10,69,70]). In this regime, Re σ ⊥ reaches a maximum and Im σ ⊥ exhibits a sign-changing resonance.…”

Section: A Effective Conductivities and Operating Regimesmentioning

confidence: 99%

Enhanced optical activity in hyperbolic metasurfaces

Kotov

Lozovik

2017

Phys. Rev. B

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“…is calculated utilizing the parameters, such as nanowire diameter (d) and spacing (S) and dealing with a hexagonal cell, the relation [20] might be applied as follows:…”

Section: Basic Modelmentioning

confidence: 99%

Enhancing the properties of plasmonic nanowires

Ioannidis¹,

Gric²,

Gorodetsky³

et al. 2019

Mater. Res. Express

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In this paper, we show the approach to enhance the optical properties of the plasmonic nanowires from the perspectives of both field enhancement and tunability. Two different cases have been suggested for the consideration: the first one uses hollow-core metamaterial interface, while the other involves metallic nanowire metamaterial interface. It has been outlined, that the use of nanowire metamaterial interface allows for stretching the frequency range of surface wave existence from 500 THz (600 nm) to approximately 1000 THz (300 nm). Moreover, the nanowire metamaterial interface demonstrates better field confinement. Submission Files Included in this PDFFile Name [File Type] cover letter.docx [Response to Reviewers] highlights.docx [Highlights] Plasmonic nanowires Gric Sep8.docx [Manuscript File]To view all the submission files, including those not included in the PDF, click on the manuscript title on your EVISE Homepage, then click 'Download zip file'. Dear Editor,First and foremost I express heartfelt appreciation to all reviewers on behalf of the authors of the manuscript. Thank you for the comments and suggestions to improve the paper. The responses to the reviewers comments are included below. Reviewer 1 (changes highlighted with yellow)In the introduction, the authors should also cite previous work on SPPs in metamaterials, specifically "Hyperbolic Polaritonic Crystals Based on Nanostructured Nanorod Metamaterials" from Wayne Dickson et al., Adv. Mat. Volume27, Issue 39, October 21, 2015, Pages 5974-5980, which considers coupling to the modes supported by such metamaterials. Additionally, SERS has gone beyond simply reaching single molecule spectroscopy: recently SERS was also used to determine the molecular orientation of single molecules. For completeness, the authors should therefore include references such as "Determining molecular orientation via single molecule SERS in a plasmonic nano-gap" from Addison R. L. Marshall et al., Nanoscale Volume 9, Issue 44, July 13, 2017, Pages 17415-17421.Addressed in the manuscript.The authors should also mention that epsilon_m needs to be negative for SPPs to exist. Although this is naturally happening in the case of a metal, here the authors consider a metamaterial which, depending on the geometry, can have either positive or negative effective permittivity.Addressed in the manuscript.Similarly, the use of epsilon_m in both the SPP dispersion at the start of the document, and later as the permittivity of the metal nanorods can lead to confusion. In the present manuscripts, the dispersion of the SPP is governed by the metamaterial's effective index as the authors later imply in equation 6.epsilon_m is used to describe the permittivity of the metal nanowires embedded into the metamaterial.The following sentence is unclear: "The mentioned frequency stands for as the intersection point of the effective dielectric permittivity perpendicular components attained tuning the diameter of the nanowire along with the distance between them." Since it is an important point of t...

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“…Hyperbolic metamaterials offer potentials in negative refraction [2], subwavelength imaging [3] and photon density enhancement [4]. The hyperbolic metamaterials can be constructed by the metal-dielectric multilayer structure [5] or metal-dielectric nanowire structure [6]. However, considering practical applications, the permittivity of metal is hard to adjust and the optics loss of metal is also hard to overcome, which limits the application of hyperbolic metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Artificial Electromagnetic Characteristics Analysis in Hyperbolic Metamaterials Slot Waveguides Based on Graphene

Li¹,

Cheng²,

Yuan³

et al. 2016

PIER C

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Abstract-In this paper, hyperbolic metamaterials slot waveguides based on graphene have been proposed to explore the optical characteristics. The hyperbolic metamaterials are composed of graphenedielectric alternating multilayer. It has been verified in our proposed structure that the optical field is enhanced efficiently in the slot region, which results in the optical gradient force becoming larger as the distance of slot region becomes smaller. Both numerical simulation and theoretical analysis systematically reveal that the stronger gradient force can be achieved through smaller slot gap or lower chemical potential. Furthermore, the optical properties of two coupled waveguides have been studied under the relation of incident wavelength, chemical potential of graphene, composition of graphenedielectric multilayer (e.g., number of periods, filling factor of graphene) of the waveguides in this work. We find that a larger gradient force can be obtained by adjusting the height of waveguides either decreasing the thickness of dielectric with constant number of periods or compressing the number of periods with fixed graphene filling factor. Our results will be helpful to the study of the optical field in the infrared region and also has great potentials in nanoscale manipulation and plasmonic devices.

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Optical characterization of epsilon-near-zero, epsilon-near-pole, and hyperbolic response in nanowire metamaterials

Cited by 63 publications

References 31 publications

Enhanced optical activity in hyperbolic metasurfaces

Enhanced optical activity in hyperbolic metasurfaces

Enhancing the properties of plasmonic nanowires

Artificial Electromagnetic Characteristics Analysis in Hyperbolic Metamaterials Slot Waveguides Based on Graphene

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