Prof. Jin-Woo Oh Profile

Prof. Jin-Woo Oh

at Pusan National Univ

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Author

Publications (6)

Proceedings Article | 1 April 2020 Presentation

Experimentally tunable nanoparticle facet for a highly efficient plasmonic nanocavity device (Conference Presentation)

Vasanthan Devaraj, Jong-Min Lee, Samir Adhikari, Won-Geun Kim, Minjun Kim, Donghan Lee, Jin-Woo Oh

Proceedings Volume 11345, 113452E (2020) https://doi.org/10.1117/12.2555634

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In realizing excellent plasmonic devices, a methodology based on flexibility and simplicity in fabrication, minimal sensitiveness to smaller nanoscale errors, larger dielectric layer thickness with superior device characteristics, and low-cost process is critically crucial for next-generation devices with multiple applications. One such attractive device is a plasmonic nanocavity, with numerous reports been already reported resulting in superior localized surface plasmon resonance (LSPR) and enhancement properties. The conventional spherical NP on a metallic mirror (NPOM) nanostructure’s plasmonic characteristics deteriorates with minor changes in dielectric layer thickness (t ≤ 6 nm). Alternatives like nanocube on mirror (NCOM), nanodisk on mirror (NDOM), provided better options towards LSPR tuning and near field enhancement. In recent times there are few reports based on faceted spherical NPOM design emerged. But however, the so far reported FNPOM nanostructures lacked the following: “facet width control, a clear SEM/TEM image of full geometry, and larger “t” with superior plasmonic characteristics”. In this work, for the first time, we report a clear FNPOM nanostructure with better control in facet fabrication using reactive thermal annealing (RTA) method. We used Ag NP on an Au mirror with SiO2 as a dielectric layer with different NP diameters of 50 nm, 70 nm and 100 nm with a precise facet width control (from 90% sphere to hemisphere). We employed a larger “t” ranging between 10 nm – 40 nm to display superior properties. From our dark field and LSPR mapping measurements, 70% of the sample are showed similar plasmonic characteristics from a 1 cm x 1 cm substrate. Our experiment results showed that it is possible to tune the LSPR resonance wavelength till 40 nm dielectric thickness reflecting it as a superior plasmonic nanocavity device. The reason behind this enhanced plasmonic characteristics is due to the introduction of facet in NPs and our three-dimensional finite difference time domain (3D FDTD) simulations results agreed well with experiment. For a final comparison, we checked our hemispherical shaped FNPOM versus NCOM design for NPs with diameter of 100 nm, where we find our FNPOM nanostructures showcased superior plasmonic properties.

Proceedings Article | 1 April 2020 Presentation

Bio-inspired M13 bacteriophage-based sub-nm actuator and its application towards the dynamic plasmonic device (Conference Presentation)

Vasanthan Devaraj, Jong-Min Lee, Hyuk Jeong, Won-Geun Kim, Jin-Woo Oh

Proceedings Volume 11361, 1136103 (2020) https://doi.org/10.1117/12.2555281

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An highly efficient plasmonic/photonic devices requires precise nanoscale structural control which becomes critically essential for variety of application requirements. Advancements in lithography and deposition methods provided precise sub-nm structure with complex processing steps at high cost. Self-ssembly technique involving M13 bacteriophage (phage) provides us an alternative option with easy fabrication, high selectivity/sensitivity, and altogether with low-cost methodology. With such merits, we demonstrate two kinds of applications: A highly efficient dynamic actuator and dynamic plasmonic device. From our phage-based device it is possible to precisely control thickness in 0.2 nm step or in a broader range resulting in realization of highly efficient dynamic actuator device. Thickness modification is cross-checked using localized surface plasmon resonance (LSPR) measurements. On the other-side, variety of interesting complex plasmonic characteristics are extensively studied and an efficient plasmonic device is realized with precise sub-nm dynamic phage thickness modification. Critically, problems involving plasmonic devices which are extremely sensitive to sub-nm scale changes (≤ 1nm) can be solved utilizing dynamic M13 phage property. To strengthen dynamic plasmonic device characteristics, we introduce the metal-coated M13 phage-based nanostructures based on a simple and straight-forward drop-casting technique. Nanowires and island/NP structures are formed with precise control and reproducibilty. Nanowires with diameter range of ~ 6.6 nm – 150 nm and islands with diameter range of ~ 100 nm – 1200 nm are fabricated. By varying the humidity, highly efficient plasmonic characteristics are realized with the help of LSPR experiments. Our home-made built-in humidity chamber equipped with atomic force microscopy measurements revealed the sub-nm thickness variation of M13 phage, which agreed well with LSPR and optical simulation results. We hope our approach utilizing M13 bacteriophage as a supporting platform will open attractive applications in field of plasmonic devices, understanding complex plasmonic modes, sensors, actuators, energy devices and few other to name.

Proceedings Article | 22 February 2017 Paper

Gap plasmonic effects of gold nanoparticles on metallic film

Hyerin Song, Heesang Ahn, Taeyeon Kim, Jin-Woo Oh, Kyujung Kim

Proceedings Volume 10080, 100800P (2017) https://doi.org/10.1117/12.2250745

KEYWORDS: Surface plasmons, Gold, Nanoparticles, Plasmonics, Scattering, Particles, Aluminum, Dielectrics, Silicon, RGB color model

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Proceedings Article | 3 November 2016 Presentation

Piezoelectric nanogenerators based on ZnO and M13 Bacteriophage nanostructures (Conference Presentation)

Dong-Myeong Shin, Kyujungg Kim, Suck Won Hong, Jin-Woo Oh, Hyung Kook Kim, Yoon-Hwae Hwang

Proceedings Volume 9927, 99270D (2016) https://doi.org/10.1117/12.2236873

KEYWORDS: Heterojunctions, Zinc oxide, Nanostructures, Nanotechnology, Nanolithography, Electronic components, Nanomaterials, Scanning electron microscopy, Nanorods, Raman scattering

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Recently, the portable and wearable electronic devices, operated in the power range of microwatt to miliwatt, become available thank to the nanotechnology development and become an essential element for a comfortable life. Our recent research interest mainly focuses on the fabrication of piezoelectric nanogenerators based on smart nanomaterials such as zinc oxide novel nanostructure, M13 bacteriophage. In this talk, we present a simple strategy for fabricating the freestanding ZnO nanorods/graphene/ZnO nanorods double sided heterostructures. The characterization of the double sided heterostructures by using SEM, and Raman scattering spectroscopy reveals the key process and working mechanism of a formation of the heterostructure. The mechanism is discussed in detail in term of the decomposed seed layer and the vacancy defect of graphene. The approach consists of a facile one-step fabrication process and could achieve ZnO coverage with a higher number density than that of the epitaxial single heterostructure. The resulting improvement in the number density of nanorods has a direct beneficial effect on the double side heterostructured nanogenerator performance. The total output voltage and current density are improved up to~2 times compared to those of a single heterostructure due to the coupling of the piezoelectric effects from both upward and downward grown nanorods. The facile one-step fabrication process suggests that double sided heterostructures would improve the performance of electrical and optoelectrical device, such as touch pad, pressure sensor, biosensor and dye-sensitized solar cells. Further, ioinspired nanogenerators based on vertically aligned phage nanopillars are inceptively demonstrated. Vertically aligned phage nanopillars enable not only a high piezoelectric response but also a tuneable piezoelectricity. Piezoelectricity is also modulated by tuning of the protein's dipoles in each phage. The sufficient electrical power from phage nanopillars thus holds promise for the development of self-powered implantable and wearable electronics.

Proceedings Article | 8 July 2015 Paper

Solvent-modified ultrafast decay dynamics in conjugated polymer/dye labeled single stranded DNA

Inhong Kim, Mijeong Kang, Han Young Woo, Jin-Woo Oh, Kwangseuk Kyhm

Proceedings Volume 9523, 95230N (2015) https://doi.org/10.1117/12.2190332

KEYWORDS: Fluorescence resonance energy transfer, Luminescence, Polymers, Energy efficiency, Molecules, Absorption, Resonance energy transfer, Picosecond phenomena, Energy transfer, Time resolved spectroscopy

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Proceedings Article | 8 July 2015 Paper

Graphene oxide-stimulated myogenic differentiation of C2C12 cells on PLGA/RGD peptide nanofiber matrices

Y. C. Shin, J. H. Lee, M. J. Kim, S. W. Hong, J.-W. Oh, C.-S. Kim, B. Kim, J. K. Hyun, Y.-J. Kim, D.-W. Han

Proceedings Volume 9523, 952305 (2015) https://doi.org/10.1117/12.2190696

KEYWORDS: Matrices, Nanofibers, Luminescence, Graphene, Tissue engineering, Proteins, Tissues, Control systems, FT-IR spectroscopy, Atomic force microscopy

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