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Hong-bo Sun - One of the best experts on this subject based on the ideXlab platform.

  • mask free construction of three dimensional silicon structures by dry etching assisted gray scale femtosecond laser direct writing
    Applied Physics Letters, 2017
    Co-Authors: Xueqing Liu, Qidai Chen, Hong-bo Sun
    Abstract:

    A mask-free micro/nano Fabrication method is proposed for constructing arbitrary gradient height structures on silicon, combining gray-scale femtosecond laser direct writing (GS-FsLDW) with subsequent dry etching. Arbitrary two-dimensional patterns with a gradient concentration of oxygen atoms can be fabricated on the surface of undoped silicon wafer by FsLDW in air. After dry etching, various three-dimensional (3D) gradient height silicon structures are fabricated by controlling the laser power, scanning step, etching time, and etching power. As an example, a well-defined 3D Fresnel zone plate was fabricated on silicon wafer, which shows excellent focusing and imaging properties. The combination of high precision from dry etching and 3D Fabrication ability on non-planar substrates of FsLDW, may broaden its applications in microelectronics, micro-optics, and microelectromechanical systems.

  • Two-photon absorption for three-dimensional micro/nanoFabrication and data storage
    Multiphoton Absorption and Nonlinear Transmission Processes: Materials Theory and Applications, 2003
    Co-Authors: Satoshi Kawata, Hong-bo Sun
    Abstract:

    We report in this article use of two-photon absorption (TPA) as an effective tool for three-dimensional (3D) Micro-Nano Fabrication. According to materials adopted, the research is classified into two categories: photopolymerizable resins for Micro-Nano structures and devices and photorefractive/photochromic materials for 3D data storage. In each case, Fabrications were benefited from the 3D spatial resolution that is intrinsic to TPA processes.

  • Single-photon and two-photon photopolymerization for Micro-Nano Fabrication
    Nonlinear Guided Waves and Their Applications, 2002
    Co-Authors: Satoshi Kawata, Satoru Shoji, Hong-bo Sun
    Abstract:

    Photopolymerizable resin is lately one of the most attractive materials for manufacturing optical microdevices and complex three-dimensional(3D) structures. We have been studying the photoFabrication of 3D Micro-Nano structures with photopolymerizable resin for Micro-Nano photonic devices and micro-electromechanical systems(MEMS). In this presentation, I will show several photopolymerization processes and Micro-Nano Fabrication methods based on single-photon and two-photon absorptions.

  • Two-Photon Laser Micro-Nano Fabrication; Understanding from Single-Voxel Level
    MRS Proceedings, 2002
    Co-Authors: Satoshi Kawata, Hong-bo Sun
    Abstract:

    Abstract : For laser nanoFabrication using two-photon photopolymerization a deep understanding of the nature of focal spots that are related to two-photon excitation is essential for achieving a high spatial resolution in three dimensions. Here we report the use of a technology we call ascending scan for characterizing the three-dimensional size and shape of single polymerization elements (voxels) and introduce several features of voxels that have not been fully noticed before. These findings are important for tailoring nanofeatures according to design.

Valerie Sheares Ashby - One of the best experts on this subject based on the ideXlab platform.

  • dynamic topographical control of mesenchymal stem cells by culture on responsive poly ϵ caprolactone surfaces
    Advanced Materials, 2011
    Co-Authors: Karina Kulangara, Andrew F Adler, Kam W Leong, Valerie Sheares Ashby
    Abstract:

    There is clear, emerging evidence in the literature supporting the influence of surface topography on various cell phenotypes.[1–5] Recent advancements in mechanobiology have relied heavily on synthetic extracellular matrix (ECM) mimics to investigate how cellular phenomena are dependent upon surface geometry. Concurrent developments in micro/nano-Fabrication techniques have enabled the construction of well-defined surface arrays which aim to emulate the extracellular microenvironment.[6] Numerous patterns of different sizes and shapes including grooves, posts, and pits have been used to study the in vitro response of various cell types such as: fibroblasts, osteoblasts, epithelial cells, neuronal cells, and more recently stem cells.[7–14]

  • Dynamic Topographical Control of Mesenchymal Stem Cells by Culture on Responsive Poly(ϵ‐caprolactone) Surfaces
    Advanced materials (Deerfield Beach Fla.), 2011
    Co-Authors: Karina Kulangara, Andrew F Adler, Kam W Leong, Valerie Sheares Ashby
    Abstract:

    There is clear, emerging evidence in the literature supporting the influence of surface topography on various cell phenotypes.[1–5] Recent advancements in mechanobiology have relied heavily on synthetic extracellular matrix (ECM) mimics to investigate how cellular phenomena are dependent upon surface geometry. Concurrent developments in micro/nano-Fabrication techniques have enabled the construction of well-defined surface arrays which aim to emulate the extracellular microenvironment.[6] Numerous patterns of different sizes and shapes including grooves, posts, and pits have been used to study the in vitro response of various cell types such as: fibroblasts, osteoblasts, epithelial cells, neuronal cells, and more recently stem cells.[7–14]

Feng Wang - One of the best experts on this subject based on the ideXlab platform.

  • Bioinspired micro/nano Fabrication on dental implant–bone interface
    Applied Surface Science, 2013
    Co-Authors: Feng Wang, Liang Shi, Dong Han, Yan Yan, Zhongying Niu, Sheng-gen Shi
    Abstract:

    Abstract Pioneering research suggests fabricating a biomimetic interface with multiscaled surfacial architecture can greatly improve biomaterials’ function and property. According to this inspiration, we chiefly single out and analyze the natural hierarchical micro/nano structure in rat's alveolar bone. Then, a combined hierarchical structure, i.e. micro-pits interlaced self-assemble TiO2 nanotubes of several tens of nanometers on dental implant's surface is developed. The as-prepared surface showed that hundreds of self-assembled TiO2 nanotubes were tightly arrayed with a diameter range of 30–50 nm, similar to collagen fibers within rat's mandible (60–80 nm). Meanwhile, this hierarchical micro/nano surface can provide a larger surface energy and roughness, a preferable hydrophilicity, a more adaptive mechanical property and adhesion work, a better bioactivity and biocompatibity, a superior attachment and growth of osteoblasts as compared to the smooth and purely micro-treated counterparts. The results indicated that this bioinspired micro/nano Fabrication on dental implant–bone interface can be potentially applied in the update of dental implant in patients’ clinical therapy and provide a new strategy for fabricating other osteocompatible materials.

  • Localized transient electron dynamics control in shaped ultrafast laser micro/nano Fabrication
    International Photonics and Optoelectronics Meetings, 2012
    Co-Authors: Cong Wang, Lan Jiang, Yanping Yuan, Feng Wang
    Abstract:

    This study proposes to control electron dynamics to change transient localized material properties by shaping femtosecond pulse trains for high-quality and high-precision laser micro/nano manufacturing, which is theoretically and experimentally validated by the first-principles calculations, plasma model and experiments’ results.

Geunbae Lim - One of the best experts on this subject based on the ideXlab platform.

  • Modification of a polyaniline nano-structured surface for selective cell behaviour
    Sensors and Actuators B: Chemical, 2017
    Co-Authors: Hyoryung Nam, Geunbae Lim
    Abstract:

    Abstract Cellular mobility is one of the key factors that must be studied to understand the intracellular environment and intracellular mechanisms. To achieve this, various methods using micro/nano Fabrication technology have been attempted. However, there are many restrictions, depending on materials, substrates, and situations. In this study, we modified surfaces readily by exploiting the mechanical fragility of nanostructures. This method is applicable to various substrates for bioengineering applications. It can also be used to modify a surface while growing cells, allowing for in situ patterning. The surface will affect cellular co-culture and tissue engineering by controlling cellular mobility.

Karina Kulangara - One of the best experts on this subject based on the ideXlab platform.

  • dynamic topographical control of mesenchymal stem cells by culture on responsive poly ϵ caprolactone surfaces
    Advanced Materials, 2011
    Co-Authors: Karina Kulangara, Andrew F Adler, Kam W Leong, Valerie Sheares Ashby
    Abstract:

    There is clear, emerging evidence in the literature supporting the influence of surface topography on various cell phenotypes.[1–5] Recent advancements in mechanobiology have relied heavily on synthetic extracellular matrix (ECM) mimics to investigate how cellular phenomena are dependent upon surface geometry. Concurrent developments in micro/nano-Fabrication techniques have enabled the construction of well-defined surface arrays which aim to emulate the extracellular microenvironment.[6] Numerous patterns of different sizes and shapes including grooves, posts, and pits have been used to study the in vitro response of various cell types such as: fibroblasts, osteoblasts, epithelial cells, neuronal cells, and more recently stem cells.[7–14]

  • Dynamic Topographical Control of Mesenchymal Stem Cells by Culture on Responsive Poly(ϵ‐caprolactone) Surfaces
    Advanced materials (Deerfield Beach Fla.), 2011
    Co-Authors: Karina Kulangara, Andrew F Adler, Kam W Leong, Valerie Sheares Ashby
    Abstract:

    There is clear, emerging evidence in the literature supporting the influence of surface topography on various cell phenotypes.[1–5] Recent advancements in mechanobiology have relied heavily on synthetic extracellular matrix (ECM) mimics to investigate how cellular phenomena are dependent upon surface geometry. Concurrent developments in micro/nano-Fabrication techniques have enabled the construction of well-defined surface arrays which aim to emulate the extracellular microenvironment.[6] Numerous patterns of different sizes and shapes including grooves, posts, and pits have been used to study the in vitro response of various cell types such as: fibroblasts, osteoblasts, epithelial cells, neuronal cells, and more recently stem cells.[7–14]