Anisotropy-Induced Transparency in Optically Dense Media

Tokman, M. D.; Erukhimova, Maria

doi:10.1007/s11141-015-9567-4

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…The narrow band of transparency within a broad line of inter-LL absorption is defined by the range of frequencies where | zz | is small enough, namely | zz | | ± | sin 2 θ. The situation is similar to the electromagnetically induced transparency (EIT) [21], only in the case of EIT the coupling between two quantum oscillators is provided by a coherent EM drive; see [22] where the cases of hybridization coupling and drive-induced coupling are compared.…”

Section: Coupling-induced Transparencymentioning

confidence: 99%

Magnetopolaritons in Weyl Semimetals in a Strong Magnetic Field

et al. 2018

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Exotic topological and transport properties of Weyl semimetals have generated a lot of excitement in the condensed matter community. Here we show that Weyl semimetals in a strong magnetic field are highly unusual optical materials. The propagation of electromagnetic waves is affected by an interplay between the plasmonic response of chiral Weyl fermions and extreme anisotropy induced by a magnetic field. The resulting magnetopolaritons possess a number of peculiar properties, such as hyperbolic dispersion, photonic stop bands, coupling-induced transparency, and broadband polarization conversion. These effects can be used for optical spectroscopy of these materials including detection of the chiral anomaly or for broadband terahertz or infrared applications.

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Section: Coupling-induced Transparencymentioning

confidence: 99%

Magnetopolaritons in Weyl Semimetals in a Strong Magnetic Field

et al. 2018

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“…However metallodielectric metamaterials are lossy and consequently exhibit limited performance in a wide range of applications due to energy dissipation. In response, there has been a concerted move toward all-dielectric metamaterials which exploit optical anisotropy and/or Mie resonances to generate unusual electromagnetic effects in practical device applications [44][45][46][47][48][49][50][51][52]. In contrast to lossy surface plasmon polaritons, Dyakonov-like surface wave packets at the interface between optically anisotropic dielectric nanostructures and an isotropic medium, have shown promise for loss-free subwavelength directional guiding of light [53][54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

Optical anisotropy in vertically oriented TiO₂nanotube arrays

et al. 2017

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Nanofabricated optically anisotropic uniaxial thin films with deep submicron feature sizes are emerging as potential platforms for low-loss all-dielectric metamaterials, and for Dyakonov surface wave-based subwavelength optical confinement and guiding at interfaces with isotropic media. In this context, we investigate the optical properties of one such uniaxial platform, namely self-organized titania nanotube arrays (TNTAs) grown by the bottom-up nanofabrication process of electrochemical anodization on silicon wafer substrates, and subsequently annealed at different temperatures, i.e. 500 °C and 750 °C. We performed detailed quantitative analysis of the structure of the TNTAs using x-ray diffraction and Raman spectroscopy, which revealed a measurable phonon confinement in TNTAs annealed at 500 °C. Variable angle spectroscopic ellipsometry was used to investigate the optical anisotropy in two kinds of TNTAs-those constituted by anatase-phase and those containing a mixture of anatase and rutile phases. Both kinds of TNTAs were found to have positive birefringence (Δn) exceeding 0.06 in the spectral region of interest while mixed phase TNTAs exhibited Δn as high as 0.15. The experimentally measured anisotropy in the refractive index of the TNTAs was compared with the predictions of two different effective medium approximations incorporating the uniaxial geometry. The measured value of Δn for TNTAs exceeded that of bulk anatase single crystals, indicating the potential of nanostructured dielectrics to outperform dielectric crystals of the same material with respect to the magnitude of the achievable directional refractive index contrast.

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“…While the mechanism for this remains unclear, there exist several works in literature attributing increase in transmittance to extraordinary optical transmission (EOT) [355][356][357] as well as plasmonic Fano resonance. [358][359][360] An in-depth investigation involving both experiments and simulations may have to be performed separately in order to unravel the contributing factor to this unusual phenomenon for this particular case of AuNR assembly on POEGMA.…”

Section: Poegmamentioning

confidence: 99%

Nanoparticle incorporated polymer brush films for sensing interfaces

Ferhan¹

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The use of polymer brushes has been attracting attention in recent years due to its ability to reduce non-specific adsorption of proteins on a surface. At the same time, noble metal nanoparticles has been widely exploited for chemical and biomolecular sensing applications, particularly via localized surface plasmon resonance and surface enhanced raman spectroscopy. While many conventional plasmonic, nanoparticle solution-based detection methods offer direct observation with high sensitivity and selectivity, they have several limitations. For example, it is difficult to discern color hue or intensity changes in colored samples or complex mixtures such as blood and serum. Nanoparticle in solution are also prone to aggregation over time, reducing shelf life. This work explores the use of polymer brushes as a matrix for the incorporation of nanoparticles. Sensing interfaces were facilely fabricated by loading unmodified gold nanoparticles (AuNPs) and gold nanorods (AuNRs) into poly(oligo(ethylene glycol) methacrylate) (POEGMA) brushes grown on glass. Depending on their size, the AuNPs would either infiltrate into the brush or adsorb on the brush/solution interface. The attainment of a three-dimensional (3D) assembly of non-infiltrating AuNP was also achieved via a novel process described as in-stacking. The AuNP-POEGMA nanocomposite structure with infiltrated AuNPs was used for lead detection based on lead ion-induced release of thiosulfate-functionalized AuNPs. The decrease in colorimetric intensity over increasing lead concentrations could easily be observed iv via unaided eyes. We obtained a limit-of-detection as low as 25 pM and a dynamic range as wide as 4 orders of magnitude. Lead detection in human serum gave recoveries of 91.0-109.9%, testimony of the effective role of POEGMA as a nonfouling polymer matrix. The AuNP-POEGMA nanostructure with adsorbed AuNPs were employed for the detection of proteins. We found that large plasmonic peak shifts of ~50 nm were actuated upon in situ functionalization as well as during target detection. They were used for thrombin detection based on aggregation and deaggregation induced upon aptamerization and protein sensing respectively. We obtained a limit-of-detection as low as 0.64 pM. Finally, AuNR-POEGMA nanocomposite structures was conveniently achieved by initially studying the influence of ionic strength and surfactant concentration on the assembly of AuNRs on a polystyrene-sulfonate (PSS)-modified substrate. The same principle was eventually applied to obtain tunable assemblies of AuNRs incorporated within the POEGMA.

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Anisotropy-Induced Transparency in Optically Dense Media

Cited by 4 publications

References 51 publications

Magnetopolaritons in Weyl Semimetals in a Strong Magnetic Field

Magnetopolaritons in Weyl Semimetals in a Strong Magnetic Field

Optical anisotropy in vertically oriented TiO₂nanotube arrays

Nanoparticle incorporated polymer brush films for sensing interfaces

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Anisotropy-Induced Transparency in Optically Dense Media

Cited by 4 publications

References 51 publications

Magnetopolaritons in Weyl Semimetals in a Strong Magnetic Field

Magnetopolaritons in Weyl Semimetals in a Strong Magnetic Field

Optical anisotropy in vertically oriented TiO2nanotube arrays

﻿Nanoparticle incorporated polymer brush films for sensing interfaces

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Product

Resources

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Optical anisotropy in vertically oriented TiO₂nanotube arrays

Nanoparticle incorporated polymer brush films for sensing interfaces