Zinc oxide nanodisk

Xu, Chunxiang; Sun, Xiao Wei; Dong, Zhili; Yu, Ming

doi:10.1063/1.1811380

Cited by 225 publications

(182 citation statements)

References 31 publications

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“…Well-defined surface structures may show completely new properties,and understanding and controlling of the structures is of great interest in order to manipulate them to the level of industrial application. General methods to form micro-/nanostructures mainly focused on electron-beam lithography [5], nanoprint lithography [6], or chemical methods [7][8][9]. Recently, high spatial frequency laser induced periodic surface structures (HSFL) have been obtained following solid target irradiation with ultrashort laser pulses [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Coherent linking of periodic nano-ripples on a ZnO crystal surface induced by femtosecond laser pulses

Guo

Yin

et al. 2008

Appl. Phys. A

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We demonstrate the coherent linking of periodic nano-ripples formed on the surface of ZnO crystals induced by femtosecond laser pulses. By adjusting the distance between two laser scanning zones, the periodic nano-ripples induced by two separated laser writing processes can be coherently linked and the ZnO nanograting with much longer grooves is therefore produced. The length limitation of this kind of nanograting previously set by the laser focus size is thus overcome. The micro-Raman mapping technique is used to evaluate the quality of coherent linking, and the underlying physics is discussed. The demonstrated scheme is promising for producing large-size self-organized nanogratings induced by femtosecond laser pulses.

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Section: Introductionmentioning

confidence: 99%

Coherent linking of periodic nano-ripples on a ZnO crystal surface induced by femtosecond laser pulses

Guo

Yin

et al. 2008

Appl. Phys. A

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“…Among a few methods to grow ZnO nanodisks, 8,9 we used a soft solution process to fabricate ZnO nanodisks using ZnO nanoparticles as seeds or buffer layers for the growth. ZnO nanoparticles were prepared through a previously reported method.…”

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confidence: 99%

Whispering-gallery-modelike-enhanced emission from ZnO nanodisk

Kim

Jang

et al. 2006

Applied Physics Letters

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Hexagonal nanodisks of ZnO were fabricated by a solution process using ZnO nanoparticles and their cathodoluminescence characteristics were investigated. Monochromatic cathodoluminescence images showed that luminescence was spatially localized near the boundary of the nanodisk and spectral analysis in conjunction with the intensity profile consistently ascribed the spatial localization of luminescence to whispering-gallery-modelike-enhanced emission. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2174122͔With the successful demonstration of various nanostructures and increasing demand for integrable optoelectronic components with existing silicon technology, small-scale dielectric resonators applicable to photonic nanodevices with low-thresholds have gained importance because they can be used as low-power-consumption light sources in integrated circuits. Reducing the size of photonic devices, however, results in decrease of luminescence intensity in such a way that careful design of intensity enhancement mechanism should be introduced. For this reason, the whispering-gallery mode, which has been particularly utilized in applications to optical communication, has attracted much attention because it is a very efficient mechanism of luminescence enhancement even in small-scale resonators. 1-4 Since a top-down approach, such as lithography, has been among the best technological methods to fabricate tailored nanostructures appropriatue for specific research or application purposes, much effort has been made in order to fabricate nanoresonators via lithography to achieve low-threshold photonic nanodevices. There are, however, a few important generic problems in top-down fabrication of nanoresonators. There is unavoidable damage to films associated with lithographic etching process. An unwanted strain effect is also involved due to the limited choice of substrates to accommodate lattice misfit. In contrast, photonic nanodevices with bottom-up-based nanoscale resonant cavity employing whispering-gallery modes ͑WGMs͒ are very promising integrable components with high luminescence efficiency. More than that, a bottom-up approach typically does not depend on the choice of substrates, which is a major advantage in integration with current silicon technology.Due to direct and wide-band-gap characteristics with a large binding exciton energy, ZnO has drawn much attention for potential application to short-wavelength optoelectronic devices. In addition to single-crystalline ZnO thin films, ZnO nanowires and nanorods with perfect crystallinity were recently fabricated, and newly developed ZnO-based nanostructures demonstrated the possibility for nanoscale optoelectronic devices. [5][6][7] In contrast with one-dimensional nanostructures, such as nanorods, hexagonal nanodisk resonators employing WGMs have a smaller effective volume of gain medium, so that it is easier to fabricate compact photonic nanodevices. In addition, nanodisks are more confined to the surface of substrate and mechanical stability of nanodisks for pos...

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“…ZnO crystals with disk shape have been recently reported to be fabricated through vapor phase transport method using the mixture of ZnO and graphite powders as the source material. 14) This reveals that the two-dimensional growth of ZnO crystals could be enhanced under reducing atmosphere. On the other hand, in our previous work, ZnO crystals of which diameters increased gradually along their length were observed from the ZnO products prepared through thermal evaporation of ZnS powder.…”

Section: Introductionmentioning

confidence: 81%

Change in the morphology of ZnO crystals by thermal evaporation method using a mixture of ZnS and graphite

Lee

2017

J. Ceram. Soc. Japan

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One dimensional rod-shaped and two dimensional twin-crystal shaped ZnO crystals were fabricated by thermal evaporation of a mixture of ZnS and graphite powders in air at atmospheric pressure. Twin-crystal shaped ZnO crystals were formed at 1050°C, while rod-shaped ZnO crystals were synthesized at 1150°C. The morphology of ZnO crystals was drastically changed according to the growth temperature. It is particularly interesting that two hexagonal plates formed a twin crystal, in which hexagonal shaped ZnO plates were symmetrically grown on both sides of a mirror-like plane. The twin crystal looked like a yo-yo. X-ray diffraction analysis showed that the rod and twin-crystal shaped ZnO crystals exhibited a wurtzite crystallographic structure. A strong green emission peak at 500 nm was observed in the cathodoluminescence spectra of the ZnO crystals at room temperature.

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Zinc oxide nanodisk

Cited by 225 publications

References 31 publications

Coherent linking of periodic nano-ripples on a ZnO crystal surface induced by femtosecond laser pulses

Coherent linking of periodic nano-ripples on a ZnO crystal surface induced by femtosecond laser pulses

Whispering-gallery-modelike-enhanced emission from ZnO nanodisk

Change in the morphology of ZnO crystals by thermal evaporation method using a mixture of ZnS and graphite

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