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| 1 | Full-space Cloud of Random Points with a Scrambling Metasurface显示文摘With the rapid progress in computer science,including artificial intelligence,big data and cloud computing,full-space spot generation can be pivotal to many practical applications,such as facial recognition,motion detection,augmented reality,etc.These opportunities may be achieved by using diffractive optical elements(DOEs)or light detection and ranging(LIDAR).However,DOEs suffer from intrinsic limitations,such as demanding depth-controlled fabrication techniques,large thicknesses(more than the wavelength),Lambertian operation only in half space,etc.LIDAR nevertheless relies on complex and bulky scanning systems,which hinders the miniaturization of the spot generator.Here,inspired by a Lambertian scatterer,we report a Hermitian-conjugate metasurface scrambling the incident light to a cloud of random points in full space with compressed information density,functioning in both transmission and reflection spaces.Over 4044 random spots are experimentally observed in the entire space,covering angles at nearly 90°.Our scrambling metasurface is made of amorphous silicon with a uniform subwavelength height,a nearly continuous phase coverage,a lightweight,flexible design,and low-heat dissipation.Thus,it may be mass produced by and integrated into existing semiconductor foundry designs.Our work opens important directions for emerging 3D recognition sensors,such as motion sensing,facial recognition,and other applications. | Zile Li Qi Dai Muhammad Q.Mehmood Guangwei Hu Boris Luk’yanchuk Jin Tao Chenglong Hao Inki Kim Heonyeong Jeong Guoxing Zheng Shaohua Yu Andrea Alù Junsuk Rho Cheng-Wei Qiu | 2018 | Light(Science & Applications)2018，7，1： | 6 |
| 2 | Geometric and physical configurations of meta-atoms for advanced metasurface holography显示文摘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 volume.In contrast to conventional holographic displays using bulky conventional diffractive optical elements,metasurface holography enables arbitrary complex wavefront shaping with a much smaller footprint.In this review,we classify metasurface holography according to the meta-atom design methodologies,which can further expand hologram functionalities.We 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 light.Six different types of metaatoms are presented,and the corresponding achievable wavefronts that form the holographic images in the far-field are also provided.Such a simple classification will give a straightforward approach to design and further realize advanced metasurface holographic devices. | Joohoon Kim Younghwan Yang Trevon Badloe Inki Kim Gwanho Yoon Junsuk Rho | 2021 | InfoMat2021，3，7： | 4 |
| 3 | Liquid crystal-powered Mie resonators for electrically tunable photorealistic color gradients and dark blacks显示文摘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 colors.Both 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 desirable.Combinations 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 gamut.Here,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 crystals.We use this to experimentally realize ultrahigh-resolution color printing,active multicolor cryptographic applications,and tunable pixels toward high-performance full-color reflective displays. | Trevon Badloe Joohoon Kim Inki Kim Won-Sik Kim Wook Sung kim Young-Ki Kim Junsuk Rho | 2022 | Light(Science & Applications)2022，11，6： | 3 |
| 4 | Structural color switching with a doped indium-gallium-zinc-oxide semiconductor显示文摘Structural coloration techniques have improved display science due to their high durability in terms of resistance to bleaching and abrasion,and low energy consumption.Here,we propose and demonstrate an all-solid-state,large-area,lithography-free color filter that can switch structural color based on a doped semiconductor.Particularly,an indium-gallium-zinc-oxide(IGZO)thin film is used as a passive index-changing layer.The refractive index of the IGZO layer is tuned by controlling the charge carrier concentration;a hydrogen plasma treatment is used to control the conductivity of the IGZO layer.In this paper,we verify the color modulation using finite difference time domain simulations and experiments.The IGZO-based color filter technology proposed in this study will pave the way for charge-controlled tunable color filters displaying a wide gamut of colors on demand. | INKI KIM JUYOUNG YUN TREVON BADLOE HYUK PARK TAEWON SEO YOUNGHWAN YANG JUHOON KIM YOONYOUNG CHUNG AND JUNSUK RHO | 2020 | Photonics Research2020，8，9： | 3 |
| 5 | Optical spin-symmetry breaking for high-efficiency directional helicity-multiplexed metaholograms显示文摘Helicity-multiplexed metasurfaces based on symmetric spin–orbit interactions (SOIs) have practical limits because they cannot provide central-symmetric holographic imaging. Asymmetric SOIs can effectively address such limitations, with several exciting applications in various fields ranging from asymmetric data inscription in communications to dual side displays in smart mobile devices. Low-loss dielectric materials provide an excellent platform for realizing such exotic phenomena efficiently. In this paper, we demonstrate an asymmetric SOI-dependent transmission-type metasurface in the visible domain using hydrogenated amorphous silicon (a-Si:H) nanoresonators. The proposed design approach is equipped with an additional degree of freedom in designing bi-directional helicity-multiplexed metasurfaces by breaking the conventional limit imposed by the symmetric SOI in half employment of metasurfaces for one circular handedness. Two on-axis, distinct wavefronts are produced with high transmission efficiencies, demonstrating the concept of asymmetric wavefront generation in two antiparallel directions. Additionally, the CMOS compatibility of a-Si:H makes it a cost-effective alternative to gallium nitride (GaN) and titanium dioxide (TiO2) for visible light. The cost-effective fabrication and simplicity of the proposed design technique provide an excellent candidate for high-efficiency, multifunctional, and chip-integrated demonstration of various phenomena. | Muhammad Ashar Naveed Muhammad Afnan Ansari Inki Kim Trevon Badloe Joohoon Kim Dong Kyo Oh Kashif Riaz Tauseef Tauqeer Usman Younis Murtaza Saleem Muhammad Sabieh Anwar Muhammad Zubair Muhammad Qasim Mehmood Junsuk Rho | 2021 | Microsystems & Nanoengineering2021，7，2： | 3 |
| 6 | Capillary-force-induced collapse lithography for controlled plasmonic nanogap structures显示文摘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/nanostructures.However,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 fabrication.Here,we present a capillary-force-induced collapse lithography(CCL)technique,which exploits the capillary force to precisely control the collapse of micro/nanostructures.CCL 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 nanopillars.CCL aims to achieve sub-10-nm plasmonic nanogap structures that promote extremely strong focusing of light.CCL is a simple and straightforward method to realize such nanogap structures that are needed for further research such as on plasmonic nanosensors. | Inki Kim Jungho Mun Wooseup Hwang Younghwan Yang Junsuk Rho | 2020 | Microsystems & Nanoengineering2020，6，1： | 2 |
| 7 | High Refractive Index Ti3O5 Films for Dielectric Metasurfaces显示文摘Ti_3 O_5 films are deposited with the help of an electron beam evaporator for their applications in metasurfaces.The film of subwavelength(632 nm) thickness is deposited on a silicon substrate and annealed at 400°C. The ellipsometr.y result shows a high refractive index above 2.5 with the minimum absorption coefficient in the visible region, which is necessary for high efficiency of transparent metasurfaces. Atomic force microscopy analysis is employed to measure the roughness of the as-deposited films. It is seen from micrographs that the deposited films are very smooth with the minimum roughness to prevent scattering and absorption losses for metasurface devices. The absence of grains and cracks can be seen by scanning electron microscope analysis, which is favorable for electron beam lithography. Fourier transform infrared spectroscopy reveals the transmission and reflection obtained from the film deposited on glass substrates. The as-deposited film shows high transmission above 60%,whieh is in good agreement with metasurfaces. | Sohail Abdul Jalil Mahreen Akram Gwanho Yoon Ayesha Khalid Dasol Lee Niloufar Raeis-Hosseini Sunae So Inki Kim Qazi Salman Ahmed Junsuk Rho Muhammad Qasim Mehmoo | 2017 | Chinese Physics Letters2017，34，8： | 2 |
| 8 | Blockade of STAT3 activation by sorafenib derivatives through enhancing SHP-1 phosphatase activity显示文摘 | Kuen-Feng Chen Wei-Tien Tai Cheng-Yi Hsu Jui-Wen Huang Chun-Yu Liu Pei-Jer Chen InKi Kim Chung-Wai Shiau | 2012 | European Journal of Medicinal Chemistry2012，，： | 1 |
| 9 | Induction of pacemaker currents by DA-9701, a prokinetic agent, in interstitial cells of Cajal from murine small intestine显示文摘 | Seok Choi Jeong June Choi Jae Yeoul Jun Jae Woong Koh Sang Hun Kim Dong Hee Kim Myoung-Yun Pyo Sangzin Choi Jin Pub Son Inki Lee Miwon Son Mirim Jin | 2009 | Molecules and Cells2009，，3： | 1 |
| 10 | Giant chiro-optical responses in multipolar-resonances-based single-layer dielectric metasurfaces显示文摘Chiro-optical effects offer a wide range of potential applications in nanophotonics,such as advanced imaging and molecular sensing and separation.Flat single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light–matter interactions.Although metasurface-based devices have manipulated electromagnetic waves,the compact on-chip realization of giant chiro-optical effects remains a challenge at optical frequencies.In this work,we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible regime.Notably,the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design freedom.The mutual coupling between carefully engineered nanofins produces constructive and destructive interference,leading to the asymmetric transmission of 70%and average circular dichroism exceeding 60%.We investigate the underlying mechanism behind the chiro-optical effects using the theory of multipolar decomposition.The proposed design mechanism maximizes the chiro-optical response through a single-layer metasurface with potential applications in high-efficiency integrated ultrathin polarization rotators and shapers,chiral polarizers for optical displays,chiral beam splitters,and chiral sensors. | HAFIZ SAAD KHALIQ INKI KIM AIMA ZAHID JOOHOON KIM TAEJUN LEE TREVON BADLOE YESEUL KIM MUHAMMAD ZUBAIR KASHIF RIAZ MUHAMMAD QASIM MEHMOOD JUNSUK RHO | 2021 | Photonics Research2021，9，9： | 1 |
| 11 | Experimental demonstration of high-Q MRR based on a germanium-on-insulator platform with an yttria insulator in the mid-IR range显示文摘We experimentally demonstrate an all-pass microring resonator (MRR) based on a Y_(2)O_(3)BOX germanium-oninsulator (GeOI) platform operating in the mid-IR region.The ring resonator was numerically designed to have a high quality (Q) factor in the 4.18μm to 4.22μm wavelength range in the fundamental TE mode.According to our design,the GeOI ring resonator was fabricated by the direct wafer-bonding technology with an yttria(Y_(2)O_(3)) buried oxide layer,which is transparent at the mid-IR region,for the bonding interface and the electron beam lithography.The experimental resonant characteristic was obtained using our fiber-based mid-IR measurement setup.The GeOI single MRR exhibited an extinction ratio (ER) of 15.28 dB and an insertion loss (IL)of 1.204 dB,and the racetrack showed an ER of 22.77 dB and an IL of 0.627 dB.Furthermore,the free spectral range of the device was 5.29 nm,and the loaded Q factor of 94,528 (176,158 of intrinsic Q factor) was extracted by the nonlinear least squares method.We believe this demonstration of our GeOI MRR offers a valuable opportunity to implement multipurpose devices such as optical sensors,switches,and filters in the mid-IR range. | JINHA LIM JOONSUP SHIM INKI KIM SANGHYEON KIM | 2023 | Photonics Research2023，11，11： | 0 |
| 12 | Vibrational circular dichroism unveils hidden clues显示文摘Infrared chiral plasmonic metamaterials based on perpendicularly positioned nanorods enable surface-enhanced vibrational circular dichroism for more selective and sensitive identification of protein fingerprints and enantioselective sensing,which creates a new pathway for chemical or biomedical applications. | Dang Du Nguyen Inki Kim | 2023 | Light(Science & Applications)2023，12，10： | 0 |
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