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A “Nanoprism” Probe for Nano-optical Applications
Kim, Taekyeong,Kim, Deok-Soo,Lee, Byung Yang,Kim, Zee Hwan,Hong, Seunghun WILEY-VCH Verlag 2009 ADVANCED MATERIALS Vol.21 No.12
<B>Graphic Abstract</B> <P>“Nanoprism” probes are fabricated for nano-optical applications. The fabrication process is scalable for mass-production, and can be used to prepare nanoprobes terminated with virtually any nanostructure, such as nanoprisms, ZnO nanorods, and nanoparticles. ANSOM imaging was performed on a nanoparticle using Au-nanoprism probes, revealing field localization at the vertices of the nanoprism. <img src='wiley_img/09359648-2009-21-12-ADMA200801528-content.gif' alt='wiley_img/09359648-2009-21-12-ADMA200801528-content'> </P>
Far-Field and Near-Field Investigation of Longitudinal Plasmons of AgAuAg Nanorods
Kim, Deok-Soo,Ahn, Sung-Hyun,Kim, Jinwook,Seo, Daeha,Song, Hyunjoon,Kim, Zee Hwan American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.37
<P>We studied the localized surface plasmons of AgAuAg-nanorods (NRs) using far-field dark-field spectromicroscopy and scattering-type scanning near-field optical microscopy (sSNOM) techniques. We observe that the far-field scattering spectra of individual AgAuAg-NRs exhibit longitudinal dipolar and octupolar resonances that are mainly determined by the overall lengths of the NRs and are fairly insensitive to the relative compositions of Ag and Au. Corresponding near-field distributions measured by sSNOM further reveal plasmonic local field patterns that closely resemble those of monolithic Au-NRs. These show that the longitudinal plasmons of AgAuAg-NRs oscillate along the entire length of the NRs, although resonance widths indicate appreciable damping by the Ag Au interfaces. The result constitutes an interesting counter-example of tunability of plasmons by composition variation and, thus, provides an important design rule for composition-tunable bimetallic plasmonic structures.</P>
Lanthanitin: A Chiral Nanoball Encapsulating 18 Lanthanum Ions by Ferritin-Like Assembly
Jeong, Kyung Seok,Kim, Young Shin,Kim, Yun Ju,Lee, Eunsung,Yoon, Ji Hye,Park, Won Hwa,Park, Young Woo,Jeon, Seung-Joon,Kim, Zee Hwan,Kim, Jaheon,Jeong, Nakcheol WILEY-VCH Verlag 2006 Angewandte Chemie Vol.45 No.48
<B>Graphic Abstract</B> <P>A chiral supramolecule, obtained by self-assembly of 24 chiral ditopic carboxylate ligands, 18 La ions, and two carbonate anions, has been dubbed lanthanitin because of its structural resemblance to ferritin. The picture shows the molecular structure of one enantiomer of lanthanitin. Color code: La blue, carbonate C green, C gray, O red; H omitted. <img src='wiley_img/14337851-2006-45-48-ANIE200603622-content.gif' alt='wiley_img/14337851-2006-45-48-ANIE200603622-content'> </P>
Kim, Deok-Soo,Kim, Zee Hwan Optical Society of America 2012 Optics express Vol.20 No.8
<P>We report that a pyramid-shaped scanning probe microscopy tip has non-zero polarizability along the in-plane direction (perpendicular to the tip axis, z) at visible frequency. The in-plane polarizability enables the scattering-type scanning near-field optical microscopy (s-SNOM) to measure the in-plane field component around a plasmon-resonant nanoparticle. Because of the non-zero in-plane polarizability, the cross-polarized s-SNOM images may contain contributions from the in-plane field component of an out-of-plane plasmon mode as well as the out-of-plane field component of an in-plane mode. By comparing a scattering model and experimental s-SNOM images, we estimate the polarization anisotropies of pyramid-shaped Si-tips and metal-coated Si-tips.</P>
Stacking Structures of Few-Layer Graphene Revealed by Phase-Sensitive Infrared Nanoscopy
Kim, Deok-Soo,Kwon, Hyuksang,Nikitin, Alexey Yu.,Ahn, Seongjin,Martí,n-Moreno, Luis,Garcí,a-Vidal, Francisco J.,Ryu, Sunmin,Min, Hongki,Kim, Zee Hwan American Chemical Society 2015 ACS NANO Vol.9 No.7
<P>The stacking orders in few-layer graphene (FLG) strongly influences the electronic properties of the material. To explore the stacking-specific properties of FLG in detail, one needs powerful microscopy techniques that visualize stacking domains with sufficient spatial resolution. We demonstrate that infrared (IR) scattering scanning near-field optical microscopy (sSNOM) directly maps out the stacking domains of FLG with a nanometric resolution, based on the stacking-specific IR conductivities of FLG. The intensity and phase contrasts of sSNOM are compared with the sSNOM contrast model, which is based on the dipolar tip–sample coupling and the theoretical conductivity spectra of FLG, allowing a clear assignment of each FLG domain as Bernal, rhombohedral, or intermediate stacks for tri-, tetra-, and pentalayer graphene. The method offers 10–100 times better spatial resolution than the far-field Raman and infrared spectroscopic methods, yet it allows far more experimental flexibility than the scanning tunneling microscopy and electron microscopy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-7/acsnano.5b02813/production/images/medium/nn-2015-02813x_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b02813'>ACS Electronic Supporting Info</A></P>