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Lim, Yongjun,Kim, Seyoon,Park, Junghyun,Kim, Hwi,Lee, Byoungho The Optical Society 2010 Applied optics Vol.49 No.7
<P>We analyzed and experimentally tested a metal-dielectric composite waveguide structure. After coating the surface of the metal layer in the Kretschmann attenuated total internal reflection configuration with a dielectric layer, we explain the coupling of incident light into the coated layer. After finding the dispersion relationships for the layered media including the metal-dielectric composite waveguide, we can determine a solution for its existence in a complex domain. By inscribing a periodic grating structure in the dielectric layer of the metal-dielectric composite waveguide, we experimentally verify the coupling of incident light on the metal-dielectric composite waveguide structure and propose its application for use as a wavelength-band selection filter.</P>
Plasmonic Light Beaming Manipulation and its Detection Using Holographic Microscopy
Yongjun Lim,Joonku Hahn,Seyoon Kim,Junghyun Park,Hwi Kim,Byoungho Lee IEEE 2010 IEEE journal of quantum electronics Vol.46 No.3
<P>Plasmonic off axis beaming and focusing of light by the use of asymmetric or non-periodic dielectric gratings around a metallic slit are experimentally demonstrated. The far-field probing was done by holographic microscopy. While the conventional near-field microscopes can probe only near-fields, our four-step phase-shift interferometer provides an efficient way of probing and reconstructing light paths coming out from the plasmonic devices. We hope our experimental work contributes to the practical applications of plasmonics such as optical interconnection and optical data storage.</P>
Transflective digital holographic microscopy and its use for probing plasmonic light beaming.
Lim, Yongjun,Lee, Seung-Yeol,Lee, Byoungho Optical Society of America 2011 Optics express Vol.19 No.6
<P>We present a novel digital holographic microscopy technique termed transflective digital holographic microscopy in order to probe plasmonic beaming fields and to view their platform structures. Here, we borrow the term, 'transflective', a portmanteau meaning a blend of transmission and reflection according to the light-collecting condition, which is conventionally used in liquid crystal display systems. Incorporating the transmission type holographic microscopy with the reflection type, achieved by the utilization of polarization property of coherent light waves, we propose an application of the system to probing the beam path and its corresponding structure in plasmonic beaming phenomena.</P>
Negative Refraction of Airy Plasmons in a Metal–Insulator–Metal Waveguide
Yongjun Lim,Seung-Yeol Lee,Kyoung-Youm Kim,Junghyun Park,Byoungho Lee IEEE 2011 Photonics Technology Letters Vol.23 No.17
<P>Airy plasmons in a metal-insulator-metal (MIM) waveguide are presented, where they can go through negative refraction. We show that the counterbending direction of Airy plasmons can be formed when they propagate through the MIM waveguide. By mainly focusing on the (1+1)-dimensional case of Airy plasmons, numerical estimation of Airy plasmons following negative refraction is given by the use of a rigorous coupled wave analysis technique. We believe that novel photonic devices and phenomena based on Airy plasmons interacting with negative index materials can be developed and applied.</P>
A Review on the Usage of RTKLIB for Precise Navigation of Unmanned Vehicles
Lim, Cheolsoon,Lee, Yongjun,Cho, Am,Park, Byungwoon 항법시스템학회 2021 Journal of Positioning, Navigation, and Timing Vol.10 No.4
Real-Time Kinematic (RTK) is a phase-based differential GNSS technique and uses additional observations from permanent reference stations to mitigate or eliminate effects like atmospheric delays or satellite clocks and orbit errors. In particular, as the position accuracy required in the fields of autonomous vehicles and drones is gradually increasing, the demand for RTK-based precise navigation that can provide cm-level position is increasing. Recently, with the rapid growth of the open-source software market, the use of open-source software for building navigation system of unmanned vehicles, which is difficult to mount an expensive GNSS receivers, is gradually increasing. RTKLIB is an open-source software package that can perform RTK positioning and is widely used for research and education purposes. However, since the performance and stability of RTK algorithm of RTKLIB is inevitably inferior to that of commercial GNSS receivers, users need to verify whether RTKLIB can satisfy the navigation performance requirements of unmanned vehicles. Therefore, in this paper, the performance evaluation of the RTK positioning algorithm of RTKLIB was performed using GNSS observation data acquired in a dynamic environment. Therefore, in this paper, the RTK positioning performance of RTKLIB was evaluated using GNSS observation data acquired in a dynamic environment. Our results show that the current RTK algorithm of RTKLIB is not suitable for precise navigation of unmanned vehicles.