Hyperbolic metamaterials and super-resolution imaging
双曲超材料和超分辨率成像
Junsuk Rho
ABSRACT
Hyperbolic metamaterials, which are one of the artificially structured nanomaterials of metamaterials, have enabled unprecedented phenomena such as super-resolution imaging and negative refraction. However, despite the great and promising science, making practical devices based on hyperbolic metamaterials have been one of the most important issues due to the difficulty of fabrication. Here, recent efforts on hyperbolic metamaterials including hyperlens and negative refraction material for practical devices will be discussed. First, realizing a super-resolution imaging device of wafer-scale hyperlens and flat hyperlens, which is the special imaging device of near- to far-field imaging of subdiffraction-limited objects at visible light with wafer-scale hyperlens device, we show the first biomolecular imaging experimental result beyond the diffraction limit by combining to conventional microscopy. We also propose a flat hyperlens, which can be achieved by coordinate transformation from a curved hyperlens. It can be a replacement for conventional hyperlens by solving the difficulties of placing a sample on the curved surface. These super-resolution imaging capabilities show that hyperlens can be used as a useful imaging tool in biology, pathology, medical science and nanotechnology. If time allows, I will also discuss metasurfaces-integrated systems for practical imaging system that enable enhancement of resolution of the fluorescence microscopy. Two different dielectric metasurfaces are designed to control confinement of the excitation point spread function and to provide encoded illumination patterns for patterned illumination. The results show the axial- and lateral-resolution improvement, respectively, and demonstrate applicability and practical use to conventional optical systems. The discussed techniques will provide an opportunity to achieve practical metamaterial devices as an important step in nanoscience.
双曲超材料是一种人工结构化的纳米超材料之一，它具有前所未有的优异性能，例如超分辨率成像和负折射。然而，尽管科学和技术前景广阔，但由于制造困难，基于双曲超材料制造实用装置仍是最重要的问题之一。在本次报告中，我们将介绍包括实用的超透镜和负折射材料在内的双曲超材料的最新研究成果。首先，我们搭建了一种晶圆级超透镜和平面型超透镜的超分辨率成像设备，利用晶圆级超透镜设备在可见光下对亚衍射极限物体进行近到远场成像的特殊成像设备。通过结合常规显微镜，首次获得了超出衍射极限的生物分子成像实验结果。我们还提出了一个平面超透镜，可以通过从弯曲超透镜进行坐标转换来实现。解决了将样品放在曲面上的困难，它可以替代传统的超透镜。这些超分辨率成像功能表明，超透镜可以用作生物学，病理学，医学和纳米技术中的有用成像工具。如果时间允许，我还将讨论用于实际成像系统的超表面集成系统，该系统能够增强荧光显微镜的分辨率。我们设计了两个不同的介电超表面，以控制激发点扩展函数的限制，并为图案化照明提供编码的照明图案。结果分别显示了轴向和横向分辨率的提高，并证明了对常规光学系统的适用性和实际应用。本次讨论的技术将为实现实际的超材料设备提供机会，这也是纳米科学中的重要一步。
BIOGRAPHY
Junsuk Rho is currently a Mu-Eun-Jae endowed chair Associate Professor with a joint appointment in the Departments of Mechanical Engineering and the Department of Chemical Engineering at Pohang University of Science and Technology (POSTECH), Korea. Before joining POSTECH, he received a degree his B.S. (2007) and M.S. (2008) in Mechanical Engineering at Seoul National University, Korea and the University of Illinois, Urbana-Champaign, respectively. After getting Ph.D. (2013) in Mechanical Engineering and Nanoscale Science & Engineering from the University of California Berkeley, he had worked as a postdoctoral fellow in Materials Sciences Division at Lawrence Berkeley National Laboratory and Ugo Fano Fellow in Nanoscience and Technology Division at Argonne National Laboratory. His research is focused on developing novel nanophotonic materials and devices based on fundamental physics and experimental studies of deep sub-wavelength light-matter interaction. Dr. Rho has published approximately 100 high impact peer-reviewed journal papers including Nature, Science, Nature Materials, Nature Photonics and Nature Communications. He also has presented keynote and invited talks more than 200 times at the world-leading institutes and international conferences/workshops as well as having 3 US patent and 25 Korea patents. He has received honorable awards including the Optical Society of America (OSA) Milton/Chang Award, the International Society for Optics and Photonics (SPIE) Scholarship (2011 & 2012), Materials Research Society (MRS) student award (2012), US DOE Argonne Named Fellowship (2013-2016), Edmund Optics educational award (2015), the Optical Society of Korea young investigator award (2016), SPIE Rising Researcher Award (2017), Korean MSIP Minister’s Commendation (2017), Proud POSTECHIAN Award (2018), Korean MSIT Minister’s Commendation (2019), Korean Presidential Early Career Award for Scientists and Engineers (2019) and Springer-Nature MINE Young Scientist Award (2020).
Junsuk Rho目前是Mu-Eun-Jae特聘的副教授，在韩国浦项科技大学（POSTECH）的机械工程系和化学工程系共同受聘。加入POSTECH之前，他于2007年获得了理学学士学位，2008年分别在韩国国立大学和伊利诺伊大学厄巴纳－香槟分校获得机械工程学博士学位。2013年获加州大学伯克利分校机械工程和纳米科学与工程专业的博士后。曾在劳伦斯伯克利国家实验室材料科学系担任博士后，在阿贡国家实验室纳米科学与技术系担任Ugo Fano研究员。他的研究致力于基础物理学和对深亚波长光物质相互作用的实验研究，以及开发新型纳米光子材料和器件。 Rho教授发表了约100篇高影响力的同行评审期刊论文，包括Nature, Science, Nature Materials, Nature Photonics and Nature Communications等等。他还在全球领先的研究机构和国际会议或研讨会上发表了200余次主题演讲，并拥有3项美国专利和25项韩国专利。他获得诸多荣誉和奖项，包括美国光学学会（OSA）Milton / Chang奖，国际光学和光子学会（SPIE）奖学金（2011和2012），材料研究学会（MRS）的学生奖（2012），美国能源部阿贡奖学金（2013-2016），埃德蒙光学（Edmund Optics）教育奖（2015），韩国光学学会青年研究员奖（2016），SPIE新兴研究员奖（2017），韩国MSIP部长表彰（2017），POSTECHIAN奖（2018） ），韩国MSIT部长表彰奖（2019），韩国总统科学家和工程师早期职业奖（2019）和施普林格自然矿山青年科学家奖（2020）。