Metal Oxide Nanowires – Structural and Mechanical Properties

Lian, Dai; Sow, Chorng Haur; Lim, Chwee Teck; Tan, V.B.C.

doi:10.5772/16349

Cited by 3 publications

(3 citation statements)

References 68 publications

(68 reference statements)

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“…Further numerical simulations for configurations such as a finite slab and a beam splitter (prism) neatly manifest remarkable DZM-expected phenomena, which have fascinating applications in optics and engineering. Our results aid in the actualization of impedance-matched, low-loss (bulky) DZMs (in the visible and throughout the EM spectrum) with moderately large index dielectrics, which might ease optical DZM fabrication through state-of-the-art metal-oxide nanowire arrays [60,61].…”

Section: Discussionmentioning

confidence: 79%

“…Such electromagnetic (EM) conditions can be fulfilled on the blue side of the spectral regime of weakly resonant scattering of dielectric nanorods. Since only moderately large dielectric constants are needed, metal oxides can be exploited with negligible losses in most of the optical domain [59], in turn synthesized as nanowires with suitable dimensions [60]; as e.g., TiO 2 nanowires, which can be easily fabricated through thermal evaporation [61]. Upon plane wave illumination, the scattering and extinction cross sections (and thus the absorption) of cylinders can be expanded as sums over different multipolar contributions [34].…”

Section: An Effective Medium Approachmentioning

confidence: 99%

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Impedance-Matched, Double-Zero Optical Metamaterials Based on Weakly Resonant Metal Oxide Nanowires

2018

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Artificial optical metamaterial with a zero index of refraction holds promise for many diverse phenomena and applications, which can be achieved with vacuum (or related) surface impedance and materials in the optical domain. Here, we propose simple metal-oxide nanorods as meta-atoms on the basis of an effective medium approach, based on their weak overlapping (electric/magnetic) resonances. We thus studied the optical properties of TiO 2 nanowire arrays with a high-filling fraction through their photonic band structure, which exhibits a double-degeneracy point without a band gap at the center of the Brillouin zone. Various configurations are considered that reveal their performance over a reasonable range of incident wave vectors as impedance-matched, double-zero, bulk (low-loss) metamaterials.

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Section: Discussionmentioning

confidence: 79%

Section: An Effective Medium Approachmentioning

confidence: 99%

Impedance-Matched, Double-Zero Optical Metamaterials Based on Weakly Resonant Metal Oxide Nanowires

2018

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“…Such situation is found in cumulenes, featuring a chain of carbon atoms coupled to each other by double bonds 24 , where the anisotropy results from the π-bond anisotropy between carbon atoms (see Figures 1(a), 2). Similar conditions can be realized in transition metals where atoms can form chain bridges between junctions [25][26][27] .…”

Section: Introductionmentioning

confidence: 72%

Electronic torsional sound in linear atomic chains: Chemical energy transport at 1000 km/s

Kurnosov

Rubtsov

Maksymov

et al. 2016

The Journal of Chemical Physics

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We investigate entirely electronic torsional vibrational modes in linear cumulene chains. The carbon nuclei of a cumulene are positioned along the primary axis so they can participate only in transverse and longitudinal motions. However, the interatomic electronic clouds behave as a torsion spring with remarkable torsional stiffness. The collective dynamics of these clouds can be described in terms of electronic vibrational quanta, which we name torsitons. It is shown that the group velocity of the wavepacket of torsitons is much higher than the typical speed of sound, because of the small mass of participating electrons compared to the atomic mass. For the same reason the maximum energy of the torsitons in cumulenes is as high as a few electronvolts, while the minimum possible energy is evaluated as a few hundred wavenumbers and this minimum is associated with asymmetry of zero point atomic vibrations. Molecular systems for experimental evaluation of the predictions are proposed.

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