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Jun Ki Kim,Jun Ki Kim,Jongki Kim,Kyunghwan Oh,Ik-Bu Sohn,Woojin Shin,Hae Young Choi,Byeongha Lee IEEE 2009 IEEE photonics technology letters Vol.21 No.1
<P>We present a compact all-fiber zone plate lens directly ablated on the surface of a mode-expanded hybrid fiber end by using a high precision femtosecond laser processing technique. To achieve a sufficiently large beam size and focusing efficiency, a segment of a coreless silica fiber having a 200-mum diameter was adapted. Focusing properties of the zone plate lens were experimentally investigated and compared with numerical simulations.</P>
Park, Jun Cheol,Lee, Kyoung Ryun,Heo, Hoseok,Kwon, Se-Hun,Kwon, Jung-Dae,Lee, Myoung-Jae,Jeon, Woojin,Jeong, Seong-Jun,Ahn, Ji-Hoon The American Chemical Society 2016 CRYSTAL GROWTH AND DESIGN Vol.16 No.7
<P>Manufacturing high-quality, two-dimensional (2D), layered materials with crystal-growth techniques is an important challenge for the advancement of 2D communication technologies. In this study, a simple method was developed for synthesizing 2D nanocrystals based on the model system of SnS2. The method involves the sulfurization of a metal oxide to a metal chalcogenide, which subsequently acts as a source of vapors for the growth of 2D crystals. The effect of the annealing conditions on the thermal sulfurization of SnO2 powder was investigated. The results showed that pure SnS2 powder could be obtained in a N-2 atmosphere at 700 degrees C. SnS2 nanocrystals were successfully synthesized from the as-prepared SnS2 powder by the vapor transport method. The synthesized SnS2 nanocrystals had a 2D layered structure with hexagonal symmetry and exhibited typical n-type semiconducting characteristics, with an optical band gap of 2.05 eV. This novel method, which uses a preferentially prepared source for vapor transport, could provide a simple way to synthesize new types of 2D layered materials. This is because it only requires the volatilization of a source and subsequent condensation to a single crystal for the growth of 2D materials, with no complex chemical reactions occurring during vapor transport.</P>