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| 1 | Recent advances in 2D,3D and higher-order topological photonics显示文摘Over the past decade,topology has emerged as a major branch in broad areas of physics,from atomic lattices to condensed matter.In particular,topology has received significant attention in photonics because light waves can serve as a platform to investigate nontrivial bulk and edge physics with the aid of carefully engineered photonic crystals and metamaterials.Simultaneously,photonics provides enriched physics that arises from spin-1 vectorial electromagnetic fields.Here,we review recent progress in the growing field of topological photonics in three parts.The first part is dedicated to the basics of topological band theory and introduces various two-dimensional topological phases.The second part reviews three-dimensional topological phases and numerous approaches to achieve them in photonics.Last,we present recently emerging fields in topological photonics that have not yet been reviewed.This part includes topological degeneracies in nonzero dimensions,unidirectional Maxwellian spin waves,higher-order photonic topological phases,and stacking of photonic crystals to attain layer pseudospin.In addition to the various approaches for realizing photonic topological phases,we also discuss the interaction between light and topological matter and the efforts towards practical applications of topological photonics. | Minkyung Kim Zubin Jacob Junsuk Rho | 2020 | Light(Science & Applications)2020，9，1： | 14 |
| 2 | Electromagnetic chirality:from fundamentals to nontraditional chiroptical phenomena显示文摘Chirality arises universally across many different fields.Recent advancements in artificial nanomaterials have demonstrated chiroptical responses that far exceed those found in natural materials.Chiroptical phenomena are complicated processes that involve transitions between states with opposite parities,and solid interpretations of these observations are yet to be clearly provided.In this review,we present a comprehensive overview of the theoretical aspects of chirality in light,nanostructures,and nanosystems and their chiroptical interactions.Descriptions of observed chiroptical phenomena based on these fundamentals are intensively discussed.We 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 responses.This 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. | Jungho Mun Minkyung Kim Younghwan Yang Trevon Badloe Jincheng Ni Yang Chen Cheng-Wei Qiu Junsuk Rho | 2020 | Light(Science & Applications)2020，9，1： | 13 |
| 3 | Thalidomide effect in endothelial cell of acute radiation proctitis显示文摘AIM: To determine whether thalidomide prevents microvascular injury in acute radiation proctitis in white rats. METHODS: Fourteen female Wistar rats were used: six in the radiation group, six in the thalidomide group, and two in normal controls. The radiation and thalidomide groups were irradiated at the pelvic area using a single 30 Gy exposure. The thalidomide (150 mg/kg) was injected into the peritoneum for 7 d from the day of irradiation. All animals were sacrificed and the rectums were removed on day 8 after irradiation. The microvessels of resected specimens were immunohistochemically stained with thrombomodulin (TM), von Willebrand Factor (vWF), and vascular endothelial growth factor (VEGF). RESULTS: The microscopic scores did not differ significantly between the radiation and thalidomide groups, but both were higher than in the control group. Expression of TM was significantly lower inthe endothelial cells (EC) of the radiation group than in the control and thalidomide groups (P < 0.001). The number of capillaries expressing vWF in the EC was higher in the radiation group (15.3 ± 6.8) than in the control group (3.7 ± 1.7), and the number of capillaries expressing vWF was attenuated by thalidomide (10.8 ± 3.5, P < 0.001). The intensity of VEGF expression in capillaries was greater in the radiation group than in the control group and was also attenuated by thalidomide (P = 0.003). CONCLUSION: The mechanisms of acute radiation- induced proctitis in the rats are related to endothelial cell injury of microvessel, which may be attenuated with thalidomide. | Ki-Tae Kim Hiun-Suk Chae Jin-Soo Kim Hyung-Keun Kim Young-Seok Cho Whang Choi Kyu-Yong Choi Sang-Young Rho Suk-Jin Kang | 2008 | World Journal of Gastroenterology2008，14，30： | 10 |
| 4 | Finding the optical properties of plasmonic structures by image processing using a combination of convolutional neural networks and recurrent neural networks显示文摘Image processing can be used to extract meaningful optical results from images.Here,from images of plasmonic structures,we combined convolutional neural networks with recurrent neural networks to extract the absorption spectra of structures.To provide the data required for the model,we performed 100,000 simulations with similar setups and random structures.In designing this deep network,we created a model that can predict the absorption response of any structure with a similar setup.We used convolutional neural networks to collect spatial information from the images,and then,we used that data and recurrent neural networks to teach the model to predict the relationship between the spatial information and the absorption spectrum.Our results show that this image processing method is accurate and can be used to replace time-and computationally-intensive numerical simulations.The trained model can predict the optical results in less than a second without the need for a strong computing system.This technique can be easily extended to cover different structures and extract any other optical properties. | Iman Sajedian Jeonghyun Kim Junsuk Rho | 2019 | Microsystems & Nanoengineering2019，5，1： | 9 |
| 5 | 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 |
| 6 | Tunable metasurfaces towards versatilemetalenses and metaholograms:a review显示文摘Metasurfaces have attracted great attention due to their ability to manipulate the phase,amplitude,and polarization of light in a compact form.Tunable metasurfaces have been investigated recently through the integration with mechanically moving components and electrically tunable elements.Two interesting applications,in particular,are to vary the focal point of metalenses and to switch between holographic images.We present the recent progress on tunable metasurfaces focused on metalenses and metaholograms,including the basic working principles,advantages,and disadvantages of each working mechanism.We classify the tunable stimuli based on the light source and electrical bias,as well as others such as thermal and mechanical modulation.We conclude by summarizing the recent progress of metalenses and metaholograms,and providing our perspectives for the further development of tunable metasurfaces. | Jaekyung Kim Junhwa Seong Younghwan Yang Seong-Won Moon Trevon Badloe Junsuk Rho | 2022 | Advanced Photonics2022，4，2： | 6 |
| 7 | Current status and challenges in sentinel node navigation surgery for early gastric cancer显示文摘Although a number of feasibility studies for sentinel node(SN) concepts in gastric cancer have been conducted since 2000, there remains a debate regarding detailed detection techniques and oncological safety. Two important multicenter phase II clinical trials were performed in Japan that used different methods and reached different conclusions; one confirmed acceptable results with a false-negative rate of 7%, and the other showed an unacceptably high false-negative rate of 46.4%. The Sentinel Node Oriented Tailored Approach(SENORITA)trial is a multicenter randomized controlled phase III trial being performed in Korea. Patient enrollment is now complete and the long-term results are currently awaited. Recently, an image-guided SN mapping technique using infrared ray/fluorescence was introduced. This method might be a promising technology because it allows the clear visualization of SNs. With regard to the primary tumor, the non-exposed endoscopic wall-inversion surgery technique and non-exposure endolaparoscopic full-thickness resection with simple suturing technique have been reported. These methods prevent abdominal infection and tumor seeding and can be good alternatives to conventional laparoscopic gastric wedge resection. For indications, SN navigation surgery can be extended to patients who underwent non-curative endoscopic resection. Although a few studies have been performed on these patients, sentinel concepts may be beneficial to patients as they omit the need for additional gastrectomy. SN navigation surgery can lead to actual organ-preserving surgery and plays a key role in improving the quality of life of patients with early gastric cancer in the future. | Bang Wool Eom Young-II Kim Hong Man Yoon Soo-Jeong Cho Jong Yeul Lee Chan GyooKim Soo Jin Kim Ji Yoon Rho Seok Ki Kim Myeong-Cherl Kook Young-Woo Kim Keun Won | 2017 | Chinese Journal of Cancer Research2017，29，2： | 5 |
| 8 | 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 |
| 9 | On-demand design of spectrally sensitive multiband absorbers using an artificial neural network显示文摘We report an approach assisted by deep learning to design spectrally sensitive multiband absorbers that work in the visible range.We propose a five-layered metal-insulator-metal grating structure composed of aluminum and silicon dioxide,and we design its structural parameters by using an artificial neural network(ANN).For a spectrally sensitive design,spectral information of resonant wavelengths is additionally provided as input as well as the reflection spectrum.The ANN facilitates highly robust design of a grating structure that has an average mean squared error(MSE)of 0.023.The optical properties of the designed structures are validated using electromagnetic simulations and experiments.Analysis of design results for gradually changing target wavelengths of input shows that the trained ANN can learn physical knowledge from data.We also propose a method to reduce the size of the ANN by exploiting observations of the trained ANN for practical applications.Our design method can also be applied to design various nanophotonic structures that are particularly sensitive to resonant wavelengths,such as spectroscopic detection and multi-color applications. | Sunae So Younghwan Yang Taejun Lee Junsuk Rho | 2021 | Photonics Research2021，9，4： | 4 |
| 10 | Multiple-patterning colloidal lithography-implemented scalable manufacturing of heat-tolerant titanium nitride broadband absorbers in the visible to near-infrared显示文摘Broadband perfect absorbers have been intensively researched for decades because of their near-perfect absorption optical property that can be applied to diverse applications. Unfortunately, achieving large-scale and heat-tolerant absorbers has been remained challenging work because of costly and time-consuming lithography methods and thermolability of materials, respectively. Here, we demonstrate a thermally robust titanium nitride broadband absorber with >95% absorption efficiency in the visible and near-infrared region (400–900 nm). A relatively large-scale (2.5 cm × 2.5 cm) absorber device is fabricated by using a fabrication technique of multiple-patterning colloidal lithography. The optical properties of the absorber are still maintained even after heating at the temperatures >600 ∘C. Such a large-scale, heat-tolerant, and broadband near-perfect absorber will provide further useful applications in solar thermophotovoltaics, stealth, and absorption controlling in high-temperature conditions. | Dasol Lee Myeongcheol Go Minkyung Kim Junho Jang Chungryong Choi Jin Kon Kim Junsuk Rho | 2021 | Microsystems & Nanoengineering2021，7，2： | 4 |
| 11 | Dietary fat-associated osteoarthritic chondrocytes gain resistance to lipotoxicity through PKCK2/STAMP2/FSP27显示文摘Free fatty acids(FFAs), which are elevated with metabolic syndrome, are considered the principal offender exerting lipotoxicity. Few previous studies have reported a causal relationship between FFAs and osteoarthritis pathogenesis. However, the molecular mechanism by which FFAs exert lipotoxicity and induce osteoarthritis remains largely unknown. We here observed that oleate at the usual clinical range does not exert lipotoxicity while oleate at high pathological ranges exerted lipotoxicity through apoptosis in articular chondrocytes. By investigating the differential effect of oleate at toxic and nontoxic concentrations, we revealed that lipid droplet(LD) accumulation confers articular chondrocytes, the resistance to lipotoxicity. Using high fat diet-induced osteoarthritis models and articular chondrocytes treated with oleate alone or oleate plus palmitate, we demonstrated that articular chondrocytes gain resistance to lipotoxicity through protein kinase casein kinase 2(PKCK2)—six-transmembrane protein of prostate 2(STAMP2)—and fat-specific protein 27(FSP27)-mediated LD accumulation. We further observed that the exertion of FFAs-induced lipotoxicity was correlated with the increased concentration of cellular FFAs freed from LDs, whether FFAs are saturated or not. In conclusion, PKCK2/STAMP2/FSP27-mediated sequestration of FFAs in LD rescues osteoarthritic chondrocytes. PKCK2/STAMP2/FSP27 should be considered for interventions against metabolic OA. | Sung Won Lee Jee Hyun Rho Sang Yeob Lee Won Tae Chung Yoo Jin Oh Jung Ha Kim Seung Hee Yoo Woo Young Kwon Ju Yong Bae Su Young Seo Hokeun Sun Hye Young Kim Young Hyun Yoo | 2018 | Bone Research2018，6，3： | 3 |
| 12 | Hyperbolic metamaterials: fusing artificial structures to natural 2D materials显示文摘Optical metamaterials have presented an innovative method of manipulating light.Hyperbolic metamaterials have an extremely high anisotropy with a hyperbolic dispersion relation.They are able to support high-k modes and exhibit a high density of states which produce distinctive properties that have been exploited in various applications,such as super-resolution imaging,negative refraction,and enhanced emission control.Here,state-of-the-art hyperbolic metamaterials are reviewed,starting from the fundamental principles to applications of artificially structured hyperbolic media to suggest ways to fuse natural two-dimensional hyperbolic materials.The review concludes by indicating the current challenges and our vision for future applications of hyperbolic metamaterials. | Dasol Lee Sunae So Guangwei Hu Minkyung Kim Trevon Badloe Hanlyun Cho Jaekyung Kim Hongyoon Kim Cheng‑Wei Qiu Junsuk Rho | 2022 | eLight2022，2，1： | 3 |
| 13 | SMART: The First Licensed Advanced Integral Reactor显示文摘 | Keung Koo Kim Wonjae Lee Shun Choi Hark Rho Kim Jaejoo Ha | 2014 | Journal of Energy and Power Engineering2014，8，1： | 3 |
| 14 | 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 |
| 15 | Nanoimprint lithography for high-throughput fabrication of metasurfaces显示文摘Metasurfaces are composed of periodic subwavelength nanostructures and exhibit optical properties that are not found in nature.They have been widely investigated for optical applications such as holograms,wavefront shaping,and structural color printing,however,electron-beam lithography is not suitable to produce large-area metasurfaces because of the high fabrication cost and low productivity.Although alternative optical technologies,such as holographic lithography and plasmonic lithography,can overcome these drawbacks,such methods are still constrained by the optical diffraction limit.To break through this fundamental problem,mechanical nanopatteming processes have been actively studied in many fields,with nanoimprint lithography(NIL)coming to the forefront.Since NIL replicates the nanopattem of the mold regardless of the diffraction limit,NIL can achieve sufficiently high productivity and patterning resolution,giving rise to an explosive development in the fabrication of metasurfaces.In this review,we focus on various NIL technologies for the manufacturing of metasurfaces.First,we briefly describe conventional NIL and then present various NIL methods for the scalable fabrication of metasurfaces.We also discuss recent applications of NIL in the realization of metasurfaces.Finally,we conclude with an outlook on each method and suggest perspectives for future research on the high-throughput fabrication of active metasurfaces. | Dong Kyo OH Taejun LEE Byoungsu KO Trevon BADLOE Jong G.OK Junsuk RHO | 2021 | Frontiers of Optoelectronics2021，14，2： | 3 |
| 16 | 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 |
| 17 | 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 |
| 18 | Molecular detection of porcine kobuviruses in pigs in Korea and their association with diarrhea显示文摘 | Seong-Jun Park Hye-Kwon Kim Hyoung-Joon Moon Dae-Sub Song Se-Mi Rho Jae-Yeon Han Van-Giap Nguyen Bong-Kyun Park | 2010 | Archives of Virology2010，，11： | 2 |
| 19 | Long Short Term Memory Networks Based Anomaly Detection for KPIs显示文摘In real-world many internet-based service companies need to closely monitor large amounts of data in order to ensure stable operation of their business.However,anomaly detection for these data with various patterns and data quality has been a great challenge,especially without labels.In this paper,we adopt an anomaly detection algorithm based on Long Short-Term Memory(LSTM)Network in terms of reconstructing KPIs and predicting KPIs.They use the reconstruction error and prediction error respectively as the criteria for judging anomalies,and we test our method with real data from a company in the insurance industry and achieved good performance. | Haiqi Zhu Fanzhi Meng Seungmin Rho Mohan Li Jianyu Wang Shaohui Liu Feng Jiang | 2019 | Computers, Materials & Continua2019，，8： | 2 |
| 20 | Robot-assisted total gastrectomy is comparable with laparoscopically assisted total gastrectomy for early gastric cancer显示文摘 | Hong Yoon Young-Woo Kim Jun Lee Keun Ryu Bang Eom Ji Park Il Choi Chan Kim Jong Lee Soo Cho Ji Rho | 2012 | Surgical Endoscopy2012，，5： | 2 |
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