Other Publications (1)
Articles by Gwanho Yoon in JoVE
Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging Dasol Lee*1, Minkyung Kim*1, Sunae So*1, Inki Kim1, Gwanho Yoon1, Kyunghoon Kim2, Junsuk Rho1,3 1Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 2School of Mechanical Engineering, Sungkyunkwan University, 3Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) The use of a hyperlens has been regarded as a novel super-resolution imaging technique due to its advantages in real-time imaging and its simple implementation with conventional optics. Here, we present a protocol describing the fabrication and imaging applications of a spherical hyperlens.
Other articles by Gwanho Yoon on PubMed
Fabrication of Three-dimensional Suspended, Interlayered and Hierarchical Nanostructures by Accuracy-improved Electron Beam Lithography Overlay Scientific Reports. Jul, 2017 | Pubmed ID: 28751643 Nanofabrication techniques are essential for exploring nanoscience and many closely related research fields such as materials, electronics, optics and photonics. Recently, three-dimensional (3D) nanofabrication techniques have been actively investigated through many different ways, however, it is still challenging to make elaborate and complex 3D nanostructures that many researchers want to realize for further interesting physics studies and device applications. Electron beam lithography, one of the two-dimensional (2D) nanofabrication techniques, is also feasible to realize elaborate 3D nanostructures by stacking each 2D nanostructures. However, alignment errors among the individual 2D nanostructures have been difficult to control due to some practical issues. In this work, we introduce a straightforward approach to drastically increase the overlay accuracy of sub-20 nm based on carefully designed alignmarks and calibrators. Three different types of 3D nanostructures whose designs are motivated from metamaterials and plasmonic structures have been demonstrated to verify the feasibility of the method, and the desired result has been achieved. We believe our work can provide a useful approach for building more advanced and complex 3D nanostructures.