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Silencing vibrations in the ground and sounds underwater


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Metamaterials that can control the refractive direction of light or absorb it to enable invisible cloaks are gaining attention. Recently, a research team at POSTECH has designed a metasurface that can control the acoustic or elastic waves. It is gaining attention as it can be used to escape from threatening earthquakes or build submarines untraceable to SONAR.
Professor Junsuk Rho of POSTECH s departments of mechanical engineering and chemical engineering and Ph.D. candidate Dongwoo Lee of the Department of Mechanical Engineering in collaboration with Professor Jensen Li of HKUST have designed an artificial structure that can control not only the domain of underwater sound but also of vibration. The research team has presented an underwater stealth metasurface independent from SONAR by controlling the acoustic resonance to absorb the wave. They also confirmed that the wave propagation through a curved plate, such as vibrations, can be drastically altered; and have ....

South Korea , Jensen Li , Dongwoo Lee , Albert Einstein , Junsuk Rho , Researcher Program , Regional Leading Research Center , Korean Ministry Of Education , Global Frontier Program , Department Of Mechanical Engineering , Korea Hydro Nuclear Power Co Ltd , National Research Foundation Of Korea , Mechanical Engineering , Applied Physics , Physical Review Applied , Professor Junsuk Rho , Korea Hydro , Mid Career Researcher Program , National Research Foundation , Korean Ministry , தெற்கு கொரியா , ஜென்சன் லி , டாங்வூ லீ , ஆல்பர்ட் ஐன்ஸ்டீன் , ஆராய்ச்சியாளர் ப்ரோக்ர்யாம் , பிராந்திய முன்னணி ஆராய்ச்சி மையம் ,

POSTECH: Silencing Vibrations in the Ground and Sounds Underwater


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Metamaterials that can control the refractive direction of light or absorb it to enable invisible cloaks are gaining attention. Recently, a research team at POSTECH has designed a metasurface that can control the acoustic or elastic waves. It is gaining attention as it can be used to escape from threatening earthquakes or build submarines untraceable to SONAR.
Professor Junsuk Rho of POSTECH’s departments of mechanical engineering and chemical engineering and Ph.D. candidate Dongwoo Lee of the Department of Mechanical Engineering in collaboration with Professor Jensen Li of HKUST have designed an artificial structure that can control not only the domain of underwater sound but also of vibration. The research team has presented an underwater stealth metasurface independent from SONAR by controlling the acoustic resonance to absorb the wave. They also confirmed that the wave propagation through a curved plate, such as vibrations, can be drastically altered; and have ....

South Korea , Jensen Li , Dongwoo Lee , Albert Einstein , Junsuk Rho , Researcher Program , Regional Leading Research Center , Korean Ministry Of Education , Global Frontier Program , Department Of Mechanical Engineering , Korea Hydro Nuclear Power Co Ltd , National Research Foundation Of Korea , Mechanical Engineering , Applied Physics , Physical Review Applied , Professor Junsuk Rho , Korea Hydro , Mid Career Researcher Program , National Research Foundation , Korean Ministry , தெற்கு கொரியா , ஜென்சன் லி , டாங்வூ லீ , ஆல்பர்ட் ஐன்ஸ்டீன் , ஆராய்ச்சியாளர் ப்ரோக்ர்யாம் , பிராந்திய முன்னணி ஆராய்ச்சி மையம் ,

Injections or light irradiation?


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IMAGE: Light instead of injections: A new concept of drug delivery system that automatically releases medication from an in vivo medical device by simply shining light whenever the drug injection is.
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Credit: POSTECH
A new concept of on-demand drug delivery system has emerged in which the drugs are automatically released from in vivo medical devices simply by shining light on the skin.
A research team led by Professor Sei Kwang Hahn of the Department of Materials Science and Engineering and Professor Kilwon Cho of the Department of Chemical Engineering at POSTECH have together developed an on-demand drug delivery system (DDS) using an organic photovoltaic cell coated with upconversion nanoparticles. This newly developed DDS allows nanoparticles to convert skin-penetrating near-infrared (NIR) light into visible light so that drug release can be controlled in medical devices installed in the body. These research findings were publish ....

Kilwon Cho , Kwang Hahn , Global Frontier Program , Department Of Chemical Engineering , Department Of Materials Science , Engineering Research Center Program , Nano Energy On , Professor Sei Kwang Hahn , Materials Science , Professor Kilwon Cho , Chemical Engineering , Nano Energy , Professor Sei Kwang , Mid Career Researcher Program , Korean Ministry , Biomechanics Biophysics , Chemistry Physics Materials Sciences , Medicine Health , Pharmaceutical Science , Pharmaceutical Chemistry , குவாங் ஹான் , உலகளாவிய எல்லை ப்ரோக்ர்யாம் , துறை ஆஃப் இரசாயன பொறியியல் , துறை ஆஃப் பொருட்கள் அறிவியல் , பொறியியல் ஆராய்ச்சி மையம் ப்ரோக்ர்யாம் , நானோ ஆற்றல் ஆன் ,

Spin hall effect of light with near 100% efficiency


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A POSTECH-KAIST joint research team has successfully developed a technique to reach near-unity efficiency of SHEL by using an artificially-designed metasurface.
Professor Junsuk Rho of POSTECH s departments of mechanical engineering and chemical engineering, and Ph.D. candidate Minkyung Kim and Dr. Dasol Lee of Department of Mechanical Engineering in collaboration with Professor Bumki Min and Hyukjoon Cho of the Department of Mechanical Engineering at KAIST have together proposed a technique to enhance the SHEL with near 100% efficiency using an anisotropic metasurface. For this, the joint research team designed a metasurface that transmits most light of one polarization and reflects the light from the other, verifying that the SHEL occurs in high-frequency region. These research findings were recently published in the February issue of Laser and Photonics Reviews, an authoritative journal in optics. ....

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