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Lee, Jaehak,Song, Juhee,Sung, Gun Yong,Shin, Jung H. American Chemical Society 2014 NANO LETTERS Vol.14 No.10
<P>Plasmonic air-gap disk resonators with 3.5 μm diameter and a 4 nm thick, 40 nm wide air gap for a mode area of only λ<SUB>0</SUB><SUP>2</SUP>/15 000 were fabricated using photolithography only. The resonant modes were clearly identified using tapered fiber coupling method at the resonant wavelengths of 1280–1620 nm. We also demonstrate the advantage of the air-gap structure by using the resonators as label-free biosensors with a sensitivity of 1.6 THz/nm.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-10/nl5018892/production/images/medium/nl-2014-018892_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5018892'>ACS Electronic Supporting Info</A></P>
Lee, Jinwoo,Lee, Jaehak,Kwon, Jinhyeong,Lee, Habeom,Eom, Hyeonjin,Yoon, Yeosang,Ha, Inho,Yang, Minyang,Ko, Seung Hwan American Chemical Society 2017 Langmuir Vol.33 No.8
<P>Controlling the surface morphology of the electrode on the nanoscale has been studied extensively because the surface morphology of a material directly leads to the functionalization in various fields of studies. In this study, we designed a simple and cost-effective method to fine-tune the surface morphology and create controlled nanopores on the silver electrode by utilizing 2-ethoxyethanol and two successive heat treatments. High electrical conductivity and mechanical robustness of nanoporous silver corroborate its prospect to be employed in various applications requiring a certain degree of flexibility. As a proof-of-concept, a high-performance supercapacitor was fabricated by electrodepositing MnO2. This method is expected to be useful in various electronic applications as well as energy storage devices.</P>
Gaussian benchmark for optical communication aiming towards ultimate capacity
Lee, Jaehak,Ji, Se-Wan,Park, Jiyong,Nha, Hyunchul American Physical Society 2016 Physical Review A Vol.93 No.5
<P>We establish the fundamental limit of communication capacity within Gaussian schemes under phase-insensitive Gaussian channels, which employ multimode Gaussian states for encoding and collective Gaussian operations and measurements for decoding. We prove that this Gaussian capacity is additive, i.e., its upper bound occurs with separable encoding and separable receivers so that a single-mode communication suffices to achieve the largest capacity under Gaussian schemes. This rigorously characterizes the gap between the ultimate Holevo capacity and the capacity within Gaussian communication, showing that Gaussian regime is not sufficient to achieve the Holevo bound particularly in the low-photon regime. Furthermore, the Gaussian benchmark established here can be used to critically assess the performance of non-Gaussian protocols for optical communication. We move on to identify non-Gaussian schemes to beat the Gaussian capacity and show that a non-Gaussian receiver recently implemented by Becerra et al. [F.E. Becerra et al., Nat. Photon. 7, 147 (2013)] can achieve this aim with an appropriately chosen encoding strategy.</P>
Jaehak Lee,Jae Young Seok,Minyang Yang,Bongchul Kang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.1
Hybrid supercapacitors are considered as one of the most promising next-generation energy storage devices, owing to highenergy, high-power density, and long-cycle life. In this work, a simple and low-cost fabrication method of the nanostructured anode with a high capacity and power is proposed for fabrication of high-performance hybrid supercapacitors. This is achieved by a one-step in-situ growth of numerous copper nanopillars on a commercially available copper foil though the galvanic displacement reaction in an aqueous ionic solution. The copper nanopillar forest-based structure with a high surface area, ion accessibility, and electron transportability provides excellent current collecting characteristics for the anode of a lithium-ion battery. The electrochemical performance of a Li half-cell incorporating the copper nanopillar-based current collector exhibits a high capacity (880 mAh g − 1 at 0.2 °C), excellent rate capability, and extremely high durability (97% after 1000 cycles). These results show that the fabricated anode structure can improve the electrochemical performance of the hybrid supercapacitors. To demonstrate the feasibility of an alternative power source, the full cell was fabricated by combining the copper nanopillar anode and an activated carbon cathode. This device provided a high energy density (98.9 Wh kg − 1 at 248 W kg − 1 ), high power density (7018 W kg − 1 ), and long-cycle life (> 1000 cycles).