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Advent of torsional optomechanics from Beth’s legacy

Advanced Photonics 2023年第4期5卷 3-4页

作者： Jaehyuck Jang jungho mun Junsuk Rho Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Torsional optomechanics,which involves the transfer of angular mo-mentum from light to matter,has been a vibrant research area since Beth’s pioneering contribution in *** proposed a method to measure the transfer of spin angular momentum using a torsional pen-dulum,1 laying the foundation for classical and quantum optomechanics related to particle levitation,trapping,and cooling in modern optics.

关键词： angular optics momentum

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Capillary-force-induced collapse lithography for controlled plasmonic nanogap structures

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Microsystems & Nanoengineering 2020年第1期6卷 404-412页

作者： Inki Kim jungho mun Wooseup Hwang Younghwan Yang 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 Chemistry Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea National Institute of Nanomaterials and Technology(NINT) Pohang 37673Republic of Korea

The capillary force effect is one of the most important fabrication parameters that must be considered at the micro/nanoscale because it is strong enough to deform micro/***,the deformation of micro/nanostructures due to such capillary forces(e.g.,stiction and collapse)has been regarded as an undesirable and uncontrollable obstacle to be avoided during ***,we present a capillary-force-induced collapse lithography(CCL)technique,which exploits the capillary force to precisely control the collapse of micro/*** uses electron-beam lithography,so nanopillars with various shapes can be fabricated by precisely controlling the capillary-force-dominant cohesion process and the nanopillar-geometry-dominant collapse process by adjusting the fabrication parameters such as the development time,electron dose,and shape of the *** aims to achieve sub-10-nm plasmonic nanogap structures that promote extremely strong focusing of *** is a simple and straightforward method to realize such nanogap structures that are needed for further research such as on plasmonic nanosensors.

关键词： capillary structures collapse

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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

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Elucidating the photoluminescence-enhancement mechanism in a push-pull conjugated polymer induced by hot-electron injection from gold nanoparticles

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Photonics Research 2021年第2期9卷 131-141页

作者： DONGKI LEE SE GYO HAN jungho mun KIHYUK YANG SUNG HYUK KIM JUNSUK RHO KILWON CHO DONGYEOP X.OH mun SEOK JEONG Department of Energy Science Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Department of Mechanical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Research Center for Bio-based Chemistry Korea Research Institute of Chemical Technology(KRICT)Ulsan 44429Republic of Korea

Understanding the photophysical interactions between the components in organic-inorganic nanocomposites is a key factor for their efficient application in optoelectronic devices. In particular, the photophysical study of nanocomposites based on organic conjugated polymers is rare. We investigated the effect of surface plasmon resonance(SPR) of gold nanoparticles(Au NPs) on the photoluminescence(PL) property of a push-pull conjugated polymer(PBDB-T). We prepared the hybrid system by incorporating poly(3-hexylthiophene)-stabilized Au NPs(P3 HT-Au NPs) into PBDB-T. The enhanced and blueshifted PL was observed in the hybrid system compared to PL in a neat PBDB-T system, indicating that the P3 HT chains attached to the Au NPs suppressed charge-transfer from PBDB-T to the Au NPs and relayed the hot electrons to PBDB-T(the band-filling effect).This photophysical phenomenon limited the auto-dissociation of PBDB-T excitons. Thus, the radiative recombination of the excitons occurred more in our hybrid system than in the neat system.

关键词： conjugated system polymer

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