Surface-texturing of sapphire by femtosecond laser pulses for photonic applications

Kudrius, Tadas; Šlekys, G.; Juodkazis, Saulius

doi:10.1088/0022-3727/43/14/145501

Cited by 64 publications

(42 citation statements)

References 26 publications

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“…[1][2][3][4] In particular, many efforts are focused on the control of the grain size, shape, porosity, texture, and density in order to understand and precisely tune their mechanical properties. Despite the numerous reported works on preparing ceramic alumina, very few of them are, however, addressing the correlation between processing, microstructure, and properties.…”

Section: Introductionmentioning

confidence: 99%

Growth and texture of spark plasma sintered Al2O3 ceramics: A combined analysis of X-rays and electron back scatter diffraction

Dhanapal

Chateigner

Lutterotti

et al. 2013

Journal of Applied Physics

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Textured alumina ceramics were obtained by Spark Plasma Sintering of undoped commercial a-Al 2 O 3 powders. Various parameters (density, grain growth, grain size distribution) of the alumina ceramics, sintered at two typical temperatures 1400 C and 1700 C, are investigated. Quantitative textural and structural analysis, carried out using a combination of Electron Back Scattering Diffraction and X-ray diffraction, are represented in the form of mapping and pole figures. The mechanical properties of these textured alumina ceramics include high elastic modulus and hardness values with high anisotropic nature, opening the door for a large range of applications. V C 2013 AIP Publishing LLC [http://dx

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Section: Introductionmentioning

confidence: 99%

Growth and texture of spark plasma sintered Al2O3 ceramics: A combined analysis of X-rays and electron back scatter diffraction

Dhanapal

Chateigner

Lutterotti

et al. 2013

Journal of Applied Physics

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“…[1][2][3] Generally, sapphire is brittle and its brittle-to-ductile transition temperature is ∼1373 K. However, the plastic deformation of sapphire crystals may occur under low loads at room temperature. 4 Recently, the evaluation of the initial stages of plasticity and elastic-plastic deformation properties of sapphire with different surface orientations at room temperature have been extensively investigated by nanoindentation tests.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale elastic–plastic deformation and stress distributions of the C plane of sapphire single crystal during nanoindentation

Mao

Shen

2011

Journal of the European Ceramic Society

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The nanoscale elastic-plastic characteristics of the C plane of sapphire single crystal were studied by ultra-low nanoindentation loads with a Berkovich indenter within the indentation depth less than 60 nm. The smaller the loading rate is, the greater the corresponding critical pop-in loads and the width of pop-in extension become. It is shown that hardness obviously exhibits the indentation size effect (ISE), which is 46.7 ± 15 GPa at the ISE region and is equal to 27.5 ± 2 GPa at the non-ISE region. The indentation modulus of the C plane decreases with increasing the indentation depth and equals 420.6 ± 20 GPa at the steady-state when the indentation depth exceeds 60 nm. Based on the Schmidt law, Hertzian contact theory and crystallography, the possibilities of activation of primary slip systems indented on the C surface and the distributions of critical resolved shear stresses on the slip plane were analyzed.

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“…Here, we employ a femtosecond (fs)-laser irradiation technique 18,19 to create optically active color centers in c-BN. Using confocal microscopy and time resolved measurements, we show that the formed voids are extremely a) SJuodkazis@swin.edu.au bright PL sources and originates from the N-vacancy related radiation center RC-defects 20 observed earlier in c-BN only by high energy particle or ionising radiation exposure 21 .…”

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confidence: 99%

Photoluminescence from voids created by femtosecond-laser pulses inside cubic-BN

et al. 2015

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Photoluminescence (PL) from femtosecond laser modified regions inside cubic-boron nitride (c-BN) was measured under UV and visible light excitation. Bright PL at the red spectral range was observed, with a typical excited state lifetime of ∼ 4 ns. Sharp emission lines are consistent with PL of intrinsic vibronic defects linked to the nitrogen vacancy formation (via Frenkel pair) observed earlier in high energy electron irradiated and ion-implanted c-BN. These, formerly known as the radiation centers, RC1, RC2, and RC3 have been identified at the locus of the voids formed by single fs-laser pulse. The method is promising to engineer color centers in c-BN for photonic applications.

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Surface-texturing of sapphire by femtosecond laser pulses for photonic applications

Cited by 64 publications

References 26 publications

Growth and texture of spark plasma sintered Al2O3 ceramics: A combined analysis of X-rays and electron back scatter diffraction

Growth and texture of spark plasma sintered Al2O3 ceramics: A combined analysis of X-rays and electron back scatter diffraction

Nanoscale elastic–plastic deformation and stress distributions of the C plane of sapphire single crystal during nanoindentation

Photoluminescence from voids created by femtosecond-laser pulses inside cubic-BN

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