Strain distribution in bent ZnO microwires

Dietrich, Christof P.; Lange, M.; Klupfel, F. J.; Wenckstern, Holger von; Schmidt‐Grund, Rüdiger; Grundmann, Marius

doi:10.1063/1.3544939

Cited by 47 publications

(84 citation statements)

References 26 publications

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“…While the near-band edge luminescence shifts about 2.5 meV from the tensile (bottom) to the compressive (top) part of the microwire (in Ref. [34], the deformation potential was determined to be @E=@e c ¼ ðÀ2:04 AE 0:02Þ eV), the energy position of the recorded WGM remains the same for all positions, corroborating that the WGM is an integral and not a local property of the cavity. In Ref.…”

Section: Bent Hexagonsmentioning

confidence: 70%

“…In Ref. [34], WGM have been also been observed for larger strain of e ¼ 3:4 Â 10 À3 . How the character of WGM possibly changes from 6-WGM to 3-WGM upon bending is subject to future work.…”

Section: Bent Hexagonsmentioning

confidence: 88%

“…[34]. Spectral linescans recorded using micro-PL of a relaxed and a bent (uniaxial stress of e c % 0:0006) ZnO microwire of nominally the same radius are compared in Fig.…”

Section: Bent Hexagonsmentioning

confidence: 99%

“…This can occur in the growth of ZnO microwires if growth conditions are somewhat anisotropic. (iii) The microwire is bent, creating an uniaxial stress state [34]. In this case the (regular) hexagon is deformed into a mirrorsymmetric shape with angles that differ from 608.…”

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confidence: 99%

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Whispering gallery modes in deformed hexagonal resonators

Grundmann

Dietrich

2012

Physica Status Solidi (b)

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Optical resonances in polygonal resonators are due to whispering gallery modes (WGM). We investigate WGM in regular and deformed hexagonal ZnO microwire resonators. Four types of geometries are investigated: regular hexagonal and dodecagonal cross sections, hexagonal cross section elongated for one pair of facets and hexagonal cross section deformed by bending (uniaxial stress). Experimental data on mode energies and angular dispersion are correlated with model calculations and Poincaré surfaces of section. Hexagonal (ϕ = 60°), square (ϕ = 45°), triangular (ϕ = 30°), and Fabry–Pérot modes (ϕ = 0°) are observed in the various investigated geometries, ϕ being the angle of incidence at the facets with respect to the normal direction. magnified image Hexagonal WGMs (green, 6‐WGM), triangular (red, 3‐WGM), and double‐triangular (blue, D3‐WGM) rays in regular hexagons, elongated hexagons and hexagons deformed by bending. Triangular WGMs are stable modes in all three resonators. Hexagonal modes are not stable in the bent hexagon.

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Section: Bent Hexagonsmentioning

confidence: 70%

Section: Bent Hexagonsmentioning

confidence: 88%

“…[34]. Spectral linescans recorded using micro-PL of a relaxed and a bent (uniaxial stress of e c % 0:0006) ZnO microwire of nominally the same radius are compared in Fig.…”

Section: Bent Hexagonsmentioning

confidence: 99%

mentioning

confidence: 99%

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Whispering gallery modes in deformed hexagonal resonators

Grundmann

Dietrich

2012

Physica Status Solidi (b)

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“…Thus, the determination of the deformation potentials and the emission characteristics of strained microand nanowires have been investigated. [6][7][8][9][10][11][12][13] For small applied strain values (jj < 1:5%), a linear shift of the exciton energy as a function of the applied strain was observed. However, the reported slope of this energy shift differs strongly in the literature.…”

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confidence: 99%

Non-linear optical deformation potentials in uniaxially strained ZnO microwires

Sturm

Wille

Lenzner

et al. 2017

Applied Physics Letters

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The emission properties of bent ZnO microwires with diameters ranging from 1.5 μm to 7.3 μm are systematically investigated by cathodoluminescence spectroscopy at T≈10 K. We induced uniaxial strains along the c-axis of up to ±2.9 %. At these high strain values, we observe a non-linear shift of the emission energy with respect to the induced strain, and the magnitude of the energy shift depends on the sign of the strain. The linear and non-linear deformation potentials were determined to be D1=−2.50±0.05 eV and D2=−15.0±0.5 eV, respectively. The non-linearity of the energy shift is also reflected in the observed spectral broadening of the emission peak as a function of the locally induced strain, which decreases with increasing strain on the compressive side and increases on the tensile side.

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Tailoring Exciton Dynamics by Elastic Strain‐Gradient in Semiconductors

et al. 2014

Advanced Materials

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In purely bent ZnO microwires, the excitons can be effectively driven and concentrated by the elastic strain-gradient towards the tensile outer side of the purely bent wire. Experimental and theoretical approaches are combined to investigate the dynamics of excitons in an inhomogeneous strain field with a uniform elastic strain-gradient. Cathodoluminescence spectroscopy analysis on purely bent ZnO microwires verifies that excitons can be effectively driven and concentrated along the elastic strain-gradient.

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Strain distribution in bent ZnO microwires

Cited by 47 publications

References 26 publications

Whispering gallery modes in deformed hexagonal resonators

Whispering gallery modes in deformed hexagonal resonators

Non-linear optical deformation potentials in uniaxially strained ZnO microwires

Tailoring Exciton Dynamics by Elastic Strain‐Gradient in Semiconductors

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