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  1. Article ; Online: Gyroelectric guided modes with transverse optical spin.

    Gong, Su-Hyun / Park, Q-Han

    Optics express

    2021  Volume 29, Issue 7, Page(s) 10631–10638

    Abstract: The transverse nature of light leads to longitudinal optical spin. Here, the unprecedented transverse optical spin of propagating waves and guided modes in a gyroelectric medium is clarified. We identify the propagation modes in a bulk gyroelectric ... ...

    Abstract The transverse nature of light leads to longitudinal optical spin. Here, the unprecedented transverse optical spin of propagating waves and guided modes in a gyroelectric medium is clarified. We identify the propagation modes in a bulk gyroelectric medium and their polarization in terms of optical spin. The anisotropic permittivity of a gyroelectric medium results in two propagation modes, slow and fast, in which the optical spin varies according to the propagation direction. When the magnetization direction of the gyroelectric medium and the propagation direction of the light are not parallel, these modes possess both the longitudinal and transverse components of optical spin. We also confirm that a gyroelectric slab waveguide induces transverse optical spin in the guided light. We investigate the transport behavior of transverse optical spin in a gyroelectric slab using numerical calculations with a modified 3D finite difference time domain method. These new gyroelectric guided modes offer a novel approach to the manipulation of optical spin on a nanoscale.
    Language English
    Publishing date 2021-04-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.421548
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Quantum efficiency of plasmonic-coupled quantum dot infrared photodetectors for single- color detection: the upper limit of plasmonic enhancement.

    Lee, S C / Kang, J-H / Park, Q / Krishna, S / Brueck, S R J

    Optics express

    2020  Volume 28, Issue 5, Page(s) 7618–7633

    Abstract: We report a measurement of the quantum efficiency for a surface plasma wave (SPW)-coupled InAs/ ... ...

    Abstract We report a measurement of the quantum efficiency for a surface plasma wave (SPW)-coupled InAs/In
    Language English
    Publishing date 2020-03-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.386844
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Polarimetric microscopy for optical control and high precision measurement of valley polarization.

    Yoo, SeokJae / Park, Q-Han

    The Review of scientific instruments

    2018  Volume 89, Issue 6, Page(s) 63118

    Abstract: Two-dimensional transition metal dichalcogenides (2D TMDCs) have two degenerate energy valleys in their Brillouin zone, and these two separate valleys can be used as an information carrier in optoelectronic devices. Circularly polarized optical pumping ... ...

    Abstract Two-dimensional transition metal dichalcogenides (2D TMDCs) have two degenerate energy valleys in their Brillouin zone, and these two separate valleys can be used as an information carrier in optoelectronic devices. Circularly polarized optical pumping can selectively populate a single valley, resulting in direct band transitions at the populated valley and associated circularly polarized photoluminescence (PL) emission. However, the birefringence and linear dichroism in optical microscopes can not only distort the circular polarization states of optical pumping but also contaminate experimentally derived information about the polarization states of valley-polarized PL signals. To solve this problem, we suggest a polarimetric microscopy method that manipulates the valley population by optical pumping and measures the polarized PL emission of 2D TMDCs; pumping beam polarization can be precisely controlled by the polarization correction unit, and the original polarization state of the emitted PL signal can be recovered using the Mueller matrix inherent to the optical experimental setup. Using our method, errors when measuring the degree of circular polarization in PL signals can be reduced from 19% to 6%, enabling accurate estimation of exciton lifetimes. Our result offers an accurate and reliable way to process information in valley-based optoelectronic devices.
    Language English
    Publishing date 2018-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.5027517
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Single nucleotide polymorphism analysis of pvmdr-1 in Plasmodium vivax isolated from military personnel of Republic of Korea in 2016 and 2017.

    Bong, Jin-Jong / Lee, Wonsig / Lee, Chan Hee / Park, Quehn / Noh, Kyung Tae

    Malaria journal

    2022  Volume 21, Issue 1, Page(s) 205

    Abstract: Background: Malaria chemoprophylaxis using chloroquine (CQ) and primaquine (PQ) has been administered to resident soldiers in the 3rd Army of Republic of Korea (ROK) to prevent malaria infection since the year 1997. Due to mass chemoprophylaxis against ... ...

    Abstract Background: Malaria chemoprophylaxis using chloroquine (CQ) and primaquine (PQ) has been administered to resident soldiers in the 3rd Army of Republic of Korea (ROK) to prevent malaria infection since the year 1997. Due to mass chemoprophylaxis against malaria, concern exists about the occurrence of chloroquine resistance (CQR). This study aimed to investigate the single nucleotide polymorphisms (SNPs) of the Plasmodium vivax multi-drug resistance protein-1 (pvmdr-1) gene to monitor the risk of CQR.
    Methods: SNPs of the pvmdr-1 gene were analysed in 73 soldiers of the 3
    Results: Quintuple mutations (G698S, L845F, M908L, T958M, and F1076L) were detected in 73 soldiers. A newly identified non-synonymous mutation in the Y541C position had been introduced into P. vivax malaria-endemic areas in ROK, at a frequency of 1.3% (1/73). In addition, synonymous mutations were detected at positions K44 (38.4%, 28/73), L493 (26%, 19/73), T529 (61.6%, 45/73), and E1233 (52.1%, 38/73). Based on these SNPs, pvmdr-1 sequences of ROK were classified into 6 haplotypes. The phylogenetic analysis closed to the type of North Korean showed that P. vivax malaria of ROK could be a reason of influx from North Korea.
    Conclusions: This study showed that synonymous and non-synonymous mutations of pvmdr-1 were observed in the malaria chemoprophylaxis-executed regions of ROK from 2016 to 2017. Based on the rapid transition of pvmdr-1 SNPs, continuous surveillance for SNPs of pvmdr-1 related to CQR in the malaria-endemic regions of ROK is essential.
    MeSH term(s) Antimalarials/pharmacology ; Antimalarials/therapeutic use ; Chloroquine/pharmacology ; Chloroquine/therapeutic use ; Humans ; Malaria, Vivax/drug therapy ; Malaria, Vivax/epidemiology ; Malaria, Vivax/prevention & control ; Military Personnel ; Phylogeny ; Plasmodium vivax/genetics ; Polymorphism, Single Nucleotide ; Republic of Korea/epidemiology
    Chemical Substances Antimalarials ; Chloroquine (886U3H6UFF)
    Language English
    Publishing date 2022-06-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 2091229-8
    ISSN 1475-2875 ; 1475-2875
    ISSN (online) 1475-2875
    ISSN 1475-2875
    DOI 10.1186/s12936-022-04214-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Tailoring Two-Dimensional Matter Using Strong Light-Matter Interactions.

    Kim, Ye-Jin / Lee, Yangjin / Choi, WonJae / Jang, Myeongjin / Park, Won-Woo / Kim, Kwanpyo / Park, Q-Han / Kwon, Oh-Hoon

    Nano letters

    2023  Volume 23, Issue 8, Page(s) 3645–3652

    Abstract: The shaping of matter into desired nanometric structures with on-demand functionalities can enhance the miniaturization of devices in nanotechnology. Herein, strong light-matter interaction was used as an optical lithographic tool to tailor two- ... ...

    Abstract The shaping of matter into desired nanometric structures with on-demand functionalities can enhance the miniaturization of devices in nanotechnology. Herein, strong light-matter interaction was used as an optical lithographic tool to tailor two-dimensional (2D) matter into nanoscale architectures. We transformed 2D black phosphorus (BP) into ultrafine, well-defined, beyond-diffraction-limit nanostructures of ten times smaller size and a hundred times smaller spacing than the incident, femtosecond-pulsed light wavelength. Consequently, nanoribbons and nanocubes/cuboids scaling tens of nanometers were formed by the structured ablation along the extremely confined periodic light fields originating from modulation instability, the tailoring process of which was visualized in real time via light-coupled
    Language English
    Publishing date 2023-03-06
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.2c04467
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  6. Article ; Online: Dynamic coupling of plasmonic resonators.

    Lee, Suyeon / Park, Q-Han

    Scientific reports

    2016  Volume 6, Page(s) 21989

    Abstract: We clarify the nature of dynamic coupling in plasmonic resonators and determine the dynamic coupling coefficient using a simple analytic model. We show that plasmonic resonators, such as subwavelength holes in a metal film which can be treated as bound ... ...

    Abstract We clarify the nature of dynamic coupling in plasmonic resonators and determine the dynamic coupling coefficient using a simple analytic model. We show that plasmonic resonators, such as subwavelength holes in a metal film which can be treated as bound charge oscillators, couple to each other through the retarded interaction of oscillating screened charges. Our dynamic coupling model offers, for the first time, a quantitative analytic description of the fundamental symmetric and anti-symmetric modes of coupled resonators which agrees with experimental results. Our model also reveals that plasmonic electromagnetically induced transparency arises in any coupled resonators of slightly unequal lengths, as confirmed by a rigorous numerical calculation and experiments.
    Language English
    Publishing date 2016-02-25
    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/srep21989
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  7. Article ; Online: Enhancement of Chiroptical Signals by Circular Differential Mie Scattering of Nanoparticles.

    Yoo, SeokJae / Park, Q-Han

    Scientific reports

    2015  Volume 5, Page(s) 14463

    Abstract: We enhance the weak optical signals of small chiral molecules via circular differential Mie scattering (CDMS) of nanoparticles immersed in them. CDMS is the preferential Mie scattering of left- and right-handed circularly polarized light by nanoparticles ...

    Abstract We enhance the weak optical signals of small chiral molecules via circular differential Mie scattering (CDMS) of nanoparticles immersed in them. CDMS is the preferential Mie scattering of left- and right-handed circularly polarized light by nanoparticles whose sizes are about the same as the wavelength of light. Solving the Mie scattering theory for chiral media, we find that the CDMS signal of the particle is linearly proportional to the chirality parameter κ of the molecules. This linear amplitude enhancement by CDMS of the particle holds, even for large particles, which have a retardation effect. We also demonstrate that the CDMS of a nanoparticle is sensitive to changes of molecular concentration, and that the nanoparticle can be utilized as a chiroptical biosensor detecting the concentration of analyte. We expect that the enhancement of molecular chiroptical signals by CDMS will pave the way for novel chiroptical spectroscopy using nanostructures.
    Language English
    Publishing date 2015-09-25
    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/srep14463
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  8. Article ; Online: Chiral Light-Matter Interaction in Optical Resonators.

    Yoo, SeokJae / Park, Q-Han

    Physical review letters

    2015  Volume 114, Issue 20, Page(s) 203003

    Abstract: The Purcell effect explains the modification of the spontaneous decay rate of quantum emitters in a resonant cavity. For quantum emitters such as chiral molecules, however, the cavity modification of the spontaneous decay rate has been little known. Here ...

    Abstract The Purcell effect explains the modification of the spontaneous decay rate of quantum emitters in a resonant cavity. For quantum emitters such as chiral molecules, however, the cavity modification of the spontaneous decay rate has been little known. Here we extend Purcell's work to the chiral light-matter interaction in optical resonators and find the differential spontaneous decay rate of chiral molecules coupled to left and right circularly polarized resonator modes. We determine the chiral Purcell factor, which characterizes the ability of optical resonators to enhance chiroptical signals, by the quality factor and the chiral mode volume of a resonator, representing, respectively, the temporal confinement of light and the spatial confinement of the helicity of light. We show that the chiral Purcell effect can be applied to chiroptical spectroscopy. Specifically, we propose a realistic scheme to achieve resonator enhanced chiroptical spectroscopy that uses the double fishnet structure as a nanoscale cuvette supporting the chiral Purcell effect.
    Language English
    Publishing date 2015-05-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.114.203003
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    Z 4' 58/153: Show issues

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  9. Article ; Online: Maximal light-energy transfer through a dielectric/metal-layered electrode on a photoactive device.

    Kim, Kyoung-Ho / Park, Q-Han

    Optics express

    2014  Volume 22, Issue 2, Page(s) 1963–1970

    Abstract: We report the fabrication of an optimized low reflective dielectric/metal-layered electrode that provides significant electrical conductivity and light transparency in the near-infrared wavelength regime. By making the metal film thickness thick enough ... ...

    Abstract We report the fabrication of an optimized low reflective dielectric/metal-layered electrode that provides significant electrical conductivity and light transparency in the near-infrared wavelength regime. By making the metal film thickness thick enough and choosing a proper dielectric layer with a certain thickness, we show that our suggested electrode significantly reduces the light reflection while preserving high electrical conductivity. We demonstrate our optimized electrodes present a highly conductive surface with a sheet resistance of 5.2 Ω/sq and a high light transmittance of near 85% in the near-infrared regime. We also apply our optimized electrode to thin-film organic photovoltaic devices and show the electrode helps in absorbing light energy inside an active layer. We believe that this simple but powerful layered electrode will pave the way for designing transparent electrodes on photoactive devices.
    MeSH term(s) Absorption ; Electric Impedance ; Electrodes ; Energy Transfer ; Equipment Design ; Equipment Failure Analysis ; Light ; Metals/chemistry ; Optical Devices ; Refractometry/instrumentation
    Chemical Substances Metals
    Language English
    Publishing date 2014-01-27
    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.22.001963
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Identification of transfusion-transmitted hepatitis A through postdonation information in Korea: results of an HAV lookback (2007-2012).

    Kim, M J / Shin, J Y / Oh, J A / Jeong, K E / Choi, Y S / Park, Q / Song, M S / Lee, D H

    Vox sanguinis

    2018  

    Abstract: Background and objectives: Despite safety measures to minimize the risk of transfusion-transmitted infections, a residual risk remains. To trace and review some such cases, we ask donors to notify the blood centre if they are diagnosed with an infection ...

    Abstract Background and objectives: Despite safety measures to minimize the risk of transfusion-transmitted infections, a residual risk remains. To trace and review some such cases, we ask donors to notify the blood centre if they are diagnosed with an infection after they donate blood.
    Materials and methods: We analysed all data on postdonation cases of hepatitis A reported between 2007 and 2012. Archived specimens from these donors were tested for hepatitis A virus (HAV) using anti-HAV IgM/IgG and HAV-PCR as markers. If any of the test results were positive, we reviewed the medical records of the recipients and, if necessary, tested them for hepatitis A.
    Results: Fifteen blood donors notified the blood centres of having been diagnosed with hepatitis A after donation. All archived samples except for one were HAV-PCR-positive and anti-HAV IgM/IgG-negative. Of the donated components, four RBCs and 14 FFPs had not been transfused to patients and were recalled. Among 26 recipients of the implicated components, fourteen were still alive when they were notified. Two patients showed clinical symptoms of hepatitis A and had positive results with anti-HAV IgM.
    Conclusion: Transfusion-transmitted hepatitis A is rare but exists. To reduce the risk, donors should be told to notify the blood centre if they are diagnosed with blood-borne diseases after they donate blood. Physicians should consider the possibility of transfusion-transmitted hepatitis A if a transfused patient has hepatitis A but no history of travel or route of faecal-oral infection.
    Language English
    Publishing date 2018-07-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 80313-3
    ISSN 1423-0410 ; 0042-9007
    ISSN (online) 1423-0410
    ISSN 0042-9007
    DOI 10.1111/vox.12672
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    In stock of ZB MED Cologne/Königswinter

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