A5036437379- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Soft Robotics and Applications
- Advanced X-ray Imaging Techniques
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Modular Robots and Swarm Intelligence
- Robotics and Automated Systems
- Power Line Inspection Robots
- Physical Unclonable Functions (PUFs) and Hardware Security
- Particle Accelerators and Free-Electron Lasers
- Robotic Locomotion and Control
- Robot Manipulation and Learning
- Adversarial Robustness in Machine Learning
- Photonic and Optical Devices
- Educational Robotics and Engineering
- Robotics and Sensor-Based Localization
- X-ray Spectroscopy and Fluorescence Analysis
- Adhesion, Friction, and Surface Interactions
- Optical measurement and interference techniques
- Advanced Antenna and Metasurface Technologies
- Robotic Path Planning Algorithms
- Advanced Materials and Mechanics
- IoT-based Smart Home Systems
- High-pressure geophysics and materials
Korea Atomic Energy Research Institute
2010-2025
Korea Advanced Institute of Science and Technology
2015-2023
Pohang University of Science and Technology
2017-2023
Kootenay Association for Science & Technology
2020
Pohang Accelerator Laboratory
2015-2020
Institute for Basic Science
2017-2019
Seoul National University
2017
Korea Institute of Fusion Energy
2012-2014
Stanford University
2004-2011
Medizinische Hochschule Hannover
2005-2008
We show that a metal-dielectric-metal structure can function as negative refraction lens for surface plasmon waves on metal surface. The is uniform with respect to plane of incidence and operates at the optical frequency range. Using three-dimensional finite-difference time-domain simulations, we demonstrate imaging operation realistic material parameters including dispersions losses. Our design should facilitate demonstration many novel effects associated chip wavelength ranges. In...
The construction of Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL), a 0.1-nm hard free-electron laser (FEL) facility based on 10-GeV S-band linear accelerator (LINAC), is achieved in Pohang, Korea by the end 2016. 1.11 km-long building was completed 2014, and installation LINAC undulators started January 2015. LINAC, together with beamlines, commissioning began April 2016, first lasing FEL line 14 June progress PAL-XFEL its commission are reported here.
We show that a planar metallic microcavity structure can exhibit an omnidirectional resonance, i.e., resonance for which the wavelength is independent of incidence angle light. The consists metal–dielectric–metal configuration. occurs when reflection phase shift cancels propagation shift. numerically demonstrate such in Ag–SiO2–Ag with realistic material parameters. Such omnidirectionally resonant structures are important all-angle efficiency enhancement light emitting diodes and photodetectors.
The consumer drone market is booming. Consumer drones are predominantly used for aerial photography; however, their use has been expanding because of autopilot technology. Unfortunately, terrorists have also begun to kamikaze bombing and reconnaissance. To protect against such threats, several companies started “anti-drone” services that primarily focus on disrupting or incapacitating operations. However, the approaches employed inadequate, they make any intruded stop remain over protected...
Over the last six years, several papers demonstrated how intentional analog interference based on acoustics, RF, lasers, and other physical modalities could induce faults, influence, or even control output of sensors. Damage to availability integrity sensor carries significant risks safety-critical systems that make automated decisions trusted measurement. Established signal processing models use transfer functions express reliability dependability characteristics sensors, but existing do...
We analyze subwavelength cylindrical holes in an optically thick metallic film with the metal described by a plasmonic model. find that dispersion diagram exhibits three distinct features have profound impact on transmission of incident light through holes. First, such always support propagating modes near surface plasmon frequency, regardless how small are. Second, fundamental mode $({\mathrm{HE}}_{11})$ is located completely below frequency and gives rise to passband spectrum. Third, when...
We have achieved heteroepitaxial stacking of a van der Waals (vdW) monolayer metal, 1T'-WTe2, and semiconductor, 2H-WSe2, in which distinctively low contact barrier was established across clean epitaxial vdW gap. Our 1T'-WTe2 films were identified as semimetal by temperature transport showed the robust breakdown current density 5.0 × 107 A/cm2. In comparison with series planar metal contacts, our to possess intrinsic Schottky heights below 100 meV for both electron hole injections,...
We calculate the guided band diagram of a metallic film with one-dimensional periodic arrangement cut-through subwavelength slits. find that this system supports two distinct types modes propagating in direction perpendicular to slits when metal obeys plasmonic dispersion model. The first type is well-known surface mode. second results from presence electromagnetic resonance inside and closely resembles waveguide dielectric slab. refer them as effective slab modes. show how behavior both...
The authors numerically demonstrate all-angle negative refraction for propagating waves, as well evanescent wave amplifications, using a one-dimensional photonic crystal consisting of metal-dielectric multilayers. Their structure has uniform surfaces parallel to the object plane and operates at visible wavelength range. Using realistic material parameters including loss, they design Ag–Si3N4 multilayer verified its subwavelength resolution in image formation process.
We investigate the effect of ZnTe incorporation on PbTe to enhance thermoelectric performance. report structural, microscopic, and spectroscopic characterizations, ab initio theoretical calculations, transport properties Pb0.985Na0.015Te-x% (x = 0, 1, 2, 4). find that solid solubility limit in is less than 1 mol %. The introduction 2% p-type Pb0.985Na0.015Te reduces lattice thermal conductivity through precipitates at microscale. Consequently, a maximum figure merit (ZT) 1.73 700 K achieved...
This paper presents a snake robot moving in small diameter pipe. A is multi-linked modular robot. The robot, KAEROT-snake IV consists of 11 2-DOF actuator modules, head, and tail module. Each the modules has two DC motors worm gear boxes to increase torque output an embedded motor controller. can move pipe with sequence holding motion as well sinusoidal motion. Some holds itself by pressing outward induce friction while other forward/backward hold at more front/rear position. moves
Resonant elastic x-ray scattering has been widely employed for exploring complex electronic ordering phenomena, such as charge, spin, and orbital order, in particular, strongly correlated systems. In addition, recent developments pump–probe allow us to expand the investigation of temporal dynamics orders. Here, we introduce a new time-resolved Soft X-ray Scattering (tr-RSXS) endstation developed at Pohang Accelerator Laboratory Free Electron Laser (PAL-XFEL). This an optical laser...
We analyze subwavelength cylindrical holes in an optically thick metallic film with the metal described by a plasmonic model. emphasize that such always support propagating modes near surface plasmon frequency, regardless of how small are. Based on this analysis, we design both single and hole arrays which play dominant role transport properties incident light. These structures exhibit region operation to best our knowledge has not been probed yet experimentally, while featuring high packing...
We are developing a shared remote control mobile robot for aerial work in nuclear power plants (NPPs); consists of platform, telescopic mast, and dual-arm slave with working tool. It is used at high location operating the manual operation mechanism fuel changer heavy water NPP. The system can cut/weld pipe remotely case an emergency or during dismantling Owing to challenging mission considering limited human operator cognitive capability, some tasks require scheme, which demands systematic...
IEEE 802.15.4 is widely used as lower layers for not only wellknown wireless communication standards such ZigBee, 6LoWPAN, and WirelessHART, but also customized protocols developed by manufacturers, particularly various Internet of Things (IoT) devices. Customized are usually publicly disclosed nor standardized. Moreover, unlike textual (e.g., HTTP, SMTP, POP3.), IoT devices provide no clues strings or keywords that useful analysis. Instead, they use bits bytes to represent header body...
Research into the gait planning of a walking robot is underlying development quadruped robots. Despite efforts in stable planning, many robots that have been developed thus far do not enough ability to adapt uneven territory. In this paper, we acquired motion data trotting lizards using capture equipment and analyzed systematically. addition, applied it kinematic model lizard trajectory each joint through an inverse solution. Moreover, proposed space-based by approximating sinusoidal...