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  1. Article ; Online: The aspect of structural connectivity in relation to age-related gait performance.

    Kim, Cheol-Woon / Kim, Yechan / Kim, Hyun-Ho / Choi, Joon Yul

    Psychoradiology

    2023  Volume 3, Page(s) kkad028

    Language English
    Publishing date 2023-11-27
    Publishing country England
    Document type Journal Article
    ISSN 2634-4416
    ISSN (online) 2634-4416
    DOI 10.1093/psyrad/kkad028
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Fiber pigtailed thin wall capillary coupler for excitation of microsphere WGM resonator.

    Wang, Hanzheng / Lan, Xinwei / Huang, Jie / Yuan, Lei / Kim, Cheol-Woon / Xiao, Hai

    Optics express

    2013  Volume 21, Issue 13, Page(s) 15834–15839

    Abstract: In this paper, we demonstrate a fiber pigtailed thin wall capillary coupler for excitation of Whispering Gallery Modes (WGMs) of microsphere resonators. The coupler is made by fusion-splicing an optical fiber with a capillary tube and consequently ... ...

    Abstract In this paper, we demonstrate a fiber pigtailed thin wall capillary coupler for excitation of Whispering Gallery Modes (WGMs) of microsphere resonators. The coupler is made by fusion-splicing an optical fiber with a capillary tube and consequently etching the capillary wall to a thickness of a few microns. Light is coupled through the peripheral contact between inserted microsphere and the etched capillary wall. The coupling efficiency as a function of the wall thickness was studied experimentally. WGM resonance with a Q-factor of 1.14 × 10(4) was observed using a borosilicate glass microsphere with a diameter of 71 μm. The coupler operates in the reflection mode and provides a robust mechanical support to the microsphere resonator. It is expected that the new coupler may find broad applications in sensors, optical filters and lasers.
    Language English
    Publishing date 2013-07-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.21.015834
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The determining factor of a preferred orientation of GaN domains grown on m-plane sapphire substrates.

    Jue, Miyeon / Kim, Cheol-Woon / Kang, Seoung-Hun / Yoon, Hansub / Jang, Dongsoo / Kwon, Young-Kyun / Kim, Chinkyo

    Scientific reports

    2015  Volume 5, Page(s) 16236

    Abstract: Epitaxial lateral overgrowth in tandem with the first-principles calculation was employed to investigate the determining factor of a preferred orientation of GaN on SiO2-patterned m-plane sapphire substrates. We found that the (1100)-orientation is ... ...

    Abstract Epitaxial lateral overgrowth in tandem with the first-principles calculation was employed to investigate the determining factor of a preferred orientation of GaN on SiO2-patterned m-plane sapphire substrates. We found that the (1100)-orientation is favored over the (1103)-orientation in the region with a small filling factor of SiO2, while the latter orientation becomes preferred in the region with a large filling factor. This result suggests that the effective concentration determines the preferred orientation of GaN: the (1100)- and (1103)-orientations preferred at their low and high concentrations, respectively. Our computational study revealed that at a low coverage of Ga and N atoms, the local atomic arrangement resembles that on the (1103) surface, although the (1100) surface is more stable at their full coverage. Such a (1103)-like atomic configuration crosses over to the local structure resembling that on the (1100) surface as the coverage increases. Based on results, we determined that high effective concentration of Ga and N sources expedites the growth of the (1103)-orientation while keeping from transition to the (1100)-orientation. At low effective concentration, on the other hand, there is a sufficient time for the added Ga and N sources to rearrange the initial (1103)-like orientation to form the (1100)-orientation.
    Language English
    Publishing date 2015-11-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep16236
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Integrated Chemical Vapor Sensor Based on Thin Wall Capillary Coupled Porous Glass Microsphere Optical Resonator.

    Wang, Hanzheng / Yuan, Lei / Kim, Cheol-Woon / Lan, Xinwei / Huang, Jie / Ma, Yinfa / Xiao, Hai

    Sensors and actuators. B, Chemical

    2015  Volume 216, Page(s) 332–336

    Abstract: A miniaturized chemical vapor sensor probe was developed using a porous glass microsphere (PGM) as the alignment-free optical microresonator. The porous microsphere was placed inside a thin wall silica capillary tube that was fusion-spliced to an optical ...

    Abstract A miniaturized chemical vapor sensor probe was developed using a porous glass microsphere (PGM) as the alignment-free optical microresonator. The porous microsphere was placed inside a thin wall silica capillary tube that was fusion-spliced to an optical fiber. The whispering gallery modes (WGMs) of the microsphere were excited by the evanescent field of the light propagating inside the capillary thin wall. Adsorption of chemical vapor molecules into the pores led to a refractive index change of the PGM and thus the resonance wavelength shift of the WGMs. To facilitate the in-taking of chemical vapor molecules into the PGM, a micro window was opened at the backend of the capillary tube using femtosecond laser micromachining. Ethanol vapor was used to demonstrate the probe for chemical vapor sensing. With a miniaturized size, integrated structure and reflection mode of operation, the proposed probe may find useful in many practical applications such as environmental monitoring and biomedical sensing.
    Language English
    Publishing date 2015-04-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1021505-0
    ISSN 0925-4005
    ISSN 0925-4005
    DOI 10.1016/j.snb.2015.04.012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Optical microresonator based on hollow sphere with porous wall for chemical sensing.

    Wang, Hanzheng / Yuan, Lei / Kim, Cheol-Woon / Han, Qun / Wei, Tao / Lan, Xinwei / Xiao, Hai

    Optics letters

    2012  Volume 37, Issue 1, Page(s) 94–96

    Abstract: A porous-wall hollow glass microsphere (PW-HGM) was investigated as an optical resonator for chemical vapor sensing. A single mode optical fiber taper was used to interrogate the microresonator. Adsorption of chemical molecules into the nanosized pores ... ...

    Abstract A porous-wall hollow glass microsphere (PW-HGM) was investigated as an optical resonator for chemical vapor sensing. A single mode optical fiber taper was used to interrogate the microresonator. Adsorption of chemical molecules into the nanosized pores induced a refractive index change of the thin wall and thus a shift in its resonance spectrum. The PW-HGM resonator had shown higher vapor detection sensitivity in comparison with a solid microsphere under similar test conditions.
    Language English
    Publishing date 2012-01-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.37.000094
    Database MEDical Literature Analysis and Retrieval System OnLINE

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