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Liquid crystal-integrated metasurfaces for an active photonic platform

Opto-Electronic Advances 2024年第6期7卷 5-29页

作者： Dohyun Kang Hyeonsu Heo Younghwan Yang junhwa seong Hongyoon Kim Joohoon Kim Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)Pohang 36763Republic of Korea POSCOPOSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

Metasurfaces have opened the door to next-generation optical devices due to their ability to dramatically modulate electromagnetic waves at will using periodically arranged ***,metasurfaces typically have static optical responses with fixed geometries of nanostructures,which poses challenges for implementing transition to technology by replacing conventional optical *** solve this problem,liquid crystals(LCs)have been actively employed for designing tunable metasurfaces using their adjustable birefringent in real ***,we review recent studies on LCpowered tunable metasurfaces,which are categorized as wavefront tuning and spectral *** to numerous reviews on tunable metasurfaces,this review intensively explores recent development of LC-integrated *** the end of this review,we briefly introduce the latest research trends on LC-powered metasurfaces and suggest further directions for improving *** hope that this review will accelerate the development of new and innovative LC-powered devices.

关键词： tunable metasurface liquid crystal active metasurface electrically tunable optical system

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Hydrogels for active photonics

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Microsystems & Nanoengineering 2024年第1期10卷 1-16页

作者： Byoungsu Ko Nara Jeon Jaekyung Kim Hyunjung Kang junhwa seong Suhyeon Yun Trevon Badloe Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Graduate School of Artificial Intelligence Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea

Conventional photonic devices exhibit static optical properties that are design-dependent,including the material’s refractive index and geometrical ***,they still possess attractive optical responses for applications and are already exploited in devices across various *** photonics has emerged as a promising solution in the field of active photonics by providing primarily deformable geometric parameters in response to external *** the past few years,various studies have been undertaken to attain stimuli-responsive photonic devices with tunable optical ***,we focus on the recent advancements in hydrogel-based photonics and micro/nanofabrication techniques for *** particular,fabrication techniques for hydrogel photonic devices are categorized into film growth,photolithography(PL),electron-beam lithography(EBL),and nanoimprint lithography(NIL).Furthermore,we provide insights into future directions and prospects for deformable hydrogel photonics,along with their potential practical applications.

关键词： lithography photonics attractive

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Tunable metasurfaces towards versatilemetalenses and metaholograms:a review

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Advanced Photonics 2022年第2期4卷 7-22页

作者： Jaekyung Kim junhwa seong Younghwan Yang seong-Won Moon Trevon Badloe Junsuk Rho Pohang University of Science and Technology Department of Mechanical EngineeringPohangRepublic of Korea Pohang University of Science and Technology Department of Chemical EngineeringPohangRepublic of Korea POSCO–POSTECH–RIST Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Metasurfaces have attracted great attention due to their ability to manipulate the phase,amplitude,and polarization of light in a compact *** metasurfaces have been investigated recently through the integration with mechanically moving components and electrically tunable *** interesting applications,in particular,are to vary the focal point of metalenses and to switch between holographic *** present the recent progress on tunable metasurfaces focused on metalenses and metaholograms,including the basic working principles,advantages,and disadvantages of each working *** classify the tunable stimuli based on the light source and electrical bias,as well as others such as thermal and mechanical *** conclude by summarizing the recent progress of metalenses and metaholograms,and providing our perspectives for the further development of tunable metasurfaces.

关键词： tunable metasurface active metasurface reconfigurable metasurface multifunctional metahologram varifocal metalens

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Integrated metasurfaces for re-envisioning a near-future disruptive optical platform

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光:科学与应用(英文版) 2023年第8期12卷 1467-1493页

作者： Younghwan Yang junhwa seong Minseok Choi Junkyeong Park Gyeongtae Kim Hongyoon Kim Junhyeon Jeong Chunghwan Jung Joohoon Kim Gyoseon Jeon Kyung-il Lee Dong Hyun Yoon Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Research Institute of Industrial Science and Technology(RIST) Pohang 37673Republic of Korea POSCOPOSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea

Metasurfaces have been continuously garnering attention in both scientific and industrial fields,owing to their unprecedented wavefront manipulation capabilities using arranged subwavelength artificial *** date,research has mainly focused on the full control of electromagnetic characteristics,including polarization,phase,amplitude,and even ***,versatile possibilities of electromagnetic wave control have been achieved,yielding practical optical components such as metalenses,beam-steerers,metaholograms,and *** research is now focused on integrating the aforementioned metasurfaces with other standard optical components(e.g.,light-emitting diodes,charged-coupled devices,micro-electro-mechanical systems,liquid crystals,heaters,refractive optical elements,planar waveguides,optical fibers,etc.)for commercialization with miniaturization trends of optical ***,this review describes and classifies metasurface-integrated optical components,and subsequently discusses their promising applications with metasurface-integrated optical platforms including those of augmented/virtual reality,light detection and ranging,and *** conclusion,this review presents several challenges and prospects that are prevalent in the field in order to accelerate the commercialization of metasurfaces-integrated optical platforms.

关键词： optical polarization surfaces

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Emerging low-cost,large-scale photonic platforms with soft lithography and self-assembly

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Photonics Insights 2023年第2期2卷 3-31页

作者： Hyunjung Kang Dohyeon Lee Younghwan Yang Dong Kyo Oh junhwa seong Jaekyung Kim Nara Jeon Dohyun Kang Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Advancements in micro/nanofabrication have enabled the realization of practical micro/nanoscale photonic devices such as absorbers,solar cells,metalenses,and *** the performance of these photonic devices has been improved by enhancing the design flexibility of structural materials through advanced fabrication methods,achieving large-area and high-throughput fabrication of tiny structural materials remains a *** this aspect,various technologies have been investigated for realizing the mass production of practical devices consisting of micro/nanostructural *** review describes the recent advancements in soft lithography,colloidal self-assembly,and block copolymer self-assembly,which are promising methods suitable for commercialization of photonic *** addition,we introduce low-cost and large-scale techniques realizing micro/nano devices with specific examples such as display technology and *** inferences presented in this review are expected to function as a guide for promising methods of accelerating the mass production of various sub-wavelength-scale photonic devices.

关键词： nanofabrication scalable manufacturing soft lithography colloidal self-assembly block copolymer self-assembly

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