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Tailoring high-refractive-index nanocomposites for manufacturing of ultraviolet metasurfaces

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Microsystems & Nanoengineering 2024年第2期10卷 303-310页

作者： Hyunjung Kang Dongkyo Oh Nara Jeon Joohoon Kim Hongyoon Kim trevon badloe Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Graduate School of Artificial Intelligence Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Electrical 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 National Institute of Nanomaterials Technology(NINT) PohangRepublic of Korea

Nanoimprint lithography(NIL)has been utilized to address the manufacturing challenges of high cost and low throughput for optical *** overcome the limitations inherent in conventional imprint resins characterized by a low refractive index(n),high-n nanocomposites have been introduced to directly serve as ***,comprehensive research on these nanocomposites is notably *** this study,we focus on the composition of high-n zirconium dioxide(ZrO_(2))nanoparticle(NP)concentration and solvents used to produce ultraviolet(UV)metaholograms and quantify the transfer fidelity by the measured conversion *** utilization of 80 wt%ZrO_(2)NPs in MIBK,MEK,and acetone results in conversion efficiencies of 62.3%,51.4%,and 61.5%,respectively,at a wavelength of 325 *** analysis of the solvent composition and NP concentration can further enhance the manufacturing capabilities of high-n nanocomposites in NIL,enabling potential practical use of optical metasurfaces.

关键词： ultraviolet refractive nanocomposites

Building an optics and photonics research ecosystem in South Korea:Collaborative innovation between academia and industry

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Light(Science & Applications) 2023年第12期12卷 2554-2557页

作者： Younghwan Yang trevon badloe Duheon Song Seongjin Park Junsuk Rho Department of Mechanical 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 Samsung Advanced Institute of Technology(SAIT) Suwon 16678Republic of Korea Pohang Iron and Steel Company(POSCO) Pohang 37859Republic of Korea Department of Chemical Engineering 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 Present address:School of System Semiconductor Engineering Yonsei UniversitySeoul 03722Republic of Korea

Photonics research is a rapidly growing field that has found applications in various aspects of our lives,ran-ging from communication to medical ***-laborative innovation between academia and industry has been a driving force behind the significant advances in photonics research in South *** this special issue,we present cutting-edge research in photonics,highlighting the importance of collaboration between academia and industry(Fig.1).

关键词： optics driving photonics

Liquid crystal-powered Mie resonators for electrically tunable photorealistic color gradients and dark blacks

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Light(Science & Applications) 2022年第6期11卷 1098-1108页

作者： trevon badloe Joohoon Kim Inki Kim Won-Sik Kim Wook Sung kim Young-Ki Kim Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Biophysics Institute of Quantum BiophysicsSungkyunkwan UniversitySuwon 16419Republic of Korea Department of Intelligent Precision Healthcare Convergence Sungkyunkwan UniversitySuwon 16419Republic 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 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

Taking inspiration from beautiful colors in nature,structural colors produced from nanostructured metasurfaces have shown great promise as a platform for bright,highly saturated,and high-resolution *** plasmonic and dielectric materials have been employed to produce static colors that fulfil the required criteria for high-performance color printing,however,for practical applications in dynamic situations,a form of tunability is *** of the additive color palette of red,green,and blue enable the expression of further colors beyond the three primary colors,while the simultaneous intensity modulation allows access to the full color ***,we demonstrate an electrically tunable metasurface that can represent saturated red,green,and blue pixels that can be dynamically and continuously controlled between on and off states using liquid *** use this to experimentally realize ultrahigh-resolution color printing,active multicolor cryptographic applications,and tunable pixels toward high-performance full-color reflective displays.

关键词： saturated printing colors

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

Electromagnetic chirality:from fundamentals to nontraditional chiroptical phenomena

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Light(Science & Applications) 2020年第1期9卷 550-567页

作者： Jungho Mun Minkyung Kim Younghwan Yang trevon badloe Jincheng Ni Yang Chen Cheng-Wei Qiu Junsuk Rho Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Korea Department of Mechanical Engineering Pohang University of Science and TechnologyPohang 37673Korea Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Chirality arises universally across many different *** advancements in artificial nanomaterials have demonstrated chiroptical responses that far exceed those found in natural *** phenomena are complicated processes that involve transitions between states with opposite parities,and solid interpretations of these observations are yet to be clearly *** this review,we present a comprehensive overview of the theoretical aspects of chirality in light,nanostructures,and nanosystems and their chiroptical *** of observed chiroptical phenomena based on these fundamentals are intensively *** start with the strong intrinsic and extrinsic chirality in plasmonic nanoparticle systems,followed by enantioselective sensing and optical manipulation,and then conclude with orbital angular momentum-dependent *** review will be helpful for understanding the mechanisms behind chiroptical phenomena based on underlying chiral properties and useful for interpreting chiroptical systems for further studies.

关键词： materials interpreting momentum

Computation at the speed of light:metamaterials for all-optical calculations and neural networks

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Advanced Photonics 2022年第6期4卷 23-43页

作者： trevon badloe Seokho Lee 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 Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

The explosion in the amount of information that is being processed is prompting the need for new computing systems beyond existing electronic *** computing is emerging as an attractive alternative due to performing calculations at the speed of light,the change for massive parallelism,and also extremely low energy *** review the physical implementation of basic optical calculations,such as differentiation and integration,using metamaterials,and introduce the realization of all-optical artificial neural *** start with concise introductions of the mathematical principles behind such optical computation methods and present the advantages,current problems that need to be overcome,and the potential future directions in the *** expect that our review will be useful for both novice and experienced researchers in the field of all-optical computing platforms using metamaterials.

关键词： photonic computing all-optical calculation optical neural network programmable metasurface

Geometric and physical configurations of meta-atoms for advanced metasurface holography

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InfoMat 2021年第7期3卷 739-754页

作者： Joohoon Kim Younghwan Yang trevon badloe Inki Kim Gwanho Yoon Junsuk Rho Department of Mechanical Engineering Pohang University of Science and TechnologyPohangSouth Korea Department of Manufacturing Systems and Design Engineering Seoul National University of Science and TechnologySeoulSouth Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohangSouth Korea

Metasurfaces consisting of subwavelength structures,so-called meta-atoms,have steadily attracted considerable attention for advanced holography due to their advantages in terms of high-resolution holographic images,large field of view,and compact device *** contrast to conventional holographic displays using bulky conventional diffractive optical elements,metasurface holography enables arbitrary complex wavefront shaping with a much smaller *** this review,we classify metasurface holography according to the meta-atom design methodologies,which can further expand hologram *** describe light-matter interactions,particularly in metasurface systems,using the relevant the Jones matrix to rigorously explain modulations of the amplitude,phase,and polarization of *** different types of metaatoms are presented,and the corresponding achievable wavefronts that form the holographic images in the far-field are also *** a simple classification will give a straightforward approach to design and further realize advanced metasurface holographic devices.

关键词： Jones calculus meta-atom metahologram metamaterial metasurface

Thermally-curable nanocomposite printing for the scalable manufacturing of dielectric metasurfaces

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Microsystems & Nanoengineering 2022年第4期8卷 73-80页

作者： Wonjoong Kim Gwanho Yoon Joohoon Kim Heonyeong Jeong Yeseul Kim Hojung Choi trevon badloe Junsuk Rho Heon Lee Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Manufacturing Systems and Design Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECHRIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

Metasurfaces consisting of artificially designed meta-atoms have been popularized recently due to their advantages of amplitude and phase of light ***,the electron beam lithography method for metasurface fabrication has high cost and low throughput,which results in a limitation for the fabrication of *** this study,nanocomposite printing technology is used to fabricate high-efficiency metasurfaces with low *** demonstrate the efficiency of the proposed fabrication method,a metahologram is designed and fabricated using a *** metahologram exhibits conversion efficiencies of 48%and 35%at wavelengths of 532 and 635 nm,*** nanocomposite is composed of polymers with nanoparticles,so durability tests are also performed to evaluate the effects of temperature and humidity on the *** test verifies that at temperatures below the glass transition temperature of the base resin,the nanostructures do not collapse,so the efficiency of the metasurfaces remains almost the *** surrounding humidity does not affect the nanostructures at ***,the durability of the nanocomposite metasurfaces can be further enhanced by replacing the base resin,and this nanocomposite printing method will facilitate practical metasurface use at low cost.

关键词： surfaces durability resin

Writing nanometer-scale structures for centimeter-scale color printing

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Advanced Photonics 2023年第3期5卷 23-24页

作者： Younghwan Yang trevon badloe Junsuk Rho Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Graduate School of Artificial IntelligencePohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Structural coloration,the production of color with nanoscale structures,has steadily gained attention owing to numerous advantages such as environmental friendliness,long-term durability,and vivid coloration compared to conventional chemical pigments.1–3 In addition,recent de-velopments in the field of nanofabrication have led to an increase in research on structural coloration with sophisticated artificial materials,known as metamaterials.

关键词： printing durability gained