Hyunjung Kang

Direct printing of metasurfaces using formulated optical materials

Hyunjung Kang, Eunji Lee, Yujin Park, Hongyoon Kim et autres

kr (code pays fourni par la source)

Actively Tunable Metalens with Varying Fields of View

Hyeonsu Heo, Minho Choi, Hyunjung Kang, Kwang‐Suk Oh et autres

Metasurfaces have emerged as compelling alternatives to conventional optics, owing to their lightweight nature, compact form factor, and diverse functional capabilities. However, their lack of postfabrication tunability limits practical applications where dynamic modulation is crucial. In this work, we integrate liquid crystal …

kr, us (code pays fourni par la source)

Extending the boundaries of ultraviolet-visible meta-optics via direct imprinting of tantalum pentoxide composite

Eunji Lee, Hyunjung Kang, H.K. Yun, Junsuk Rho

Broadband metasurfaces capable of precise electromagnetic wave control from the ultraviolet (UV) to the visible range enable applications such as multispectral imaging, secure multi-band optical encryption, and multi-spectral microscopy. However, realizing scalable UV-visible broadband metasurfaces remains challenging due to the subwavelength critical …

kr (code pays fourni par la source)

High‐Index, Low‐Loss Optical Material Platforms for Ultra‐Broadband Ultraviolet‐to‐Visible Achromatic Metalenses

Hyunjung Kang, Dongmin Jeon, Eunji Lee, Junsuk Rho

ABSTRACT Achromatic metalenses offer a route toward compact and lightweight optical systems; however, extending broadband operation into the ultraviolet (UV) regime remains challenging because few materials simultaneously provide a high refractive index and low optical absorption. Here, we present a photonic platform …

kr (code pays fourni par la source)

Breaking the optical loss barrier in amorphous silicon across the full visible spectrum via dopant-controlled chemical vapor deposition

Younghwan Yang, Hyeonae Im, Eunji Lee, Hyunjung Kang et autres

The propagation of light in nanophotonic structures is governed by the refractive index and optical dispersion of constituent materials. However, the choice of dielectrics is often restricted within the transparency window. We introduce object-driven engineering of the process of silicon-based dielectric materials …

kr (code pays fourni par la source)

Electrically Reconfigurable Illumination-Engineering Metalens Enabling Quasi-Dark-Field Biological Imaging

Jaekyung Kim, Hongyoon Kim, Hyunjung Kang, Hwanyong Choi et autres

Metasurface-based optical image processing has enabled compact and low-power platforms, yet wavefront-differentiation-based metasurfaces remain fundamentally constrained by their reliance on coherent illumination and intrinsically static optical responses. Meanwhile, conventional optical microscopes rely on bulky, mechanically actuated condensers to engineer illumination numerical aperture …

kr, us (code pays fourni par la source)

Nanoprinting metasurfaces with engineered optical materials

Dong Kyo Oh, Hyunjung Kang, Dohyun Kang, Joohoon Kim et autres

kr (code pays fourni par la source)

Water-soluble metasurface labels for environmentally sustainable humidity monitoring, origin authentication, and anticounterfeit packaging

Hyunjung Kang, Hongyoon Kim, Junsuk Rho

Anticounterfeiting and environmental sustainability have become key priorities in modern packaging and product labeling. Although metasurface-based optical security systems offer ultrathin profiles and strong resistance to forgery, their adoption has been limited by expensive, low-throughput fabrication methods. At the same time, growing …

kr (code pays fourni par la source)

Hybrid high-index composite meta-structures with atomic layer-coated nanoparticle-embedded resin

Minseok Choi, Hyunjung Kang, Do-Hyun Kang, Joohoon Kim et autres

Abstract Metasurfaces offer great potential to replace conventional optics by enabling multi-functionalities in compact form factors. However, their mass production remains at crossroads, as most materials compatible with scalable fabrication like nanoimprint lithography (NIL) exhibit relatively low refractive indices (~ 2), which …

kr (code pays fourni par la source)

Switchable multi-mode metalens for versatile bright-field and edge-enhanced imaging

Aqib Raza Shah, Eunji Lee, Isma Javed, Naveed Muhammad et autres

A compact dual-mode microscopy system integrates bright-field and edge-enhanced imaging into a single, tunable setup. The system employs a dual-mode metalens designed solely based on the geometric phase, ensuring simplicity and efficiency. By bonding a liquid-crystal (LC) cell onto the metasurface as …

pk, cn, us (code pays fourni par la source)

Compact eye camera with two-third wavelength phase-delay metalens

Jeong-Geun Yun, Hyunjung Kang, Kyookeun Lee, Youngmo Jeong et autres

The essential role of mobile devices in modern life has driven increasing demand for compact, lightweight, and high-performance imaging systems. Recently, metalenses, which manipulate electromagnetic waves through sub-wavelength nanostructures on flat surfaces, have emerged as promising alternatives to traditional refractive lenses. However, …

kr (code pays fourni par la source)

Mechanically robust and self-cleanable encapsulated metalens via spin-on-glass packaging

Younghwan Yang, Do-Hyun Kang, Junhwa Seong, Seokwoo Kim et autres

Metalenses-two-dimensionally arranged artificial nanostructures that focus light-have been extensively studied due to their great potential for applications in consumer goods and industrial products. However, when metalenses are exposed to harsh environments, they can suffer from mechanical shocks and damage, leading to degradation …

kr (code pays fourni par la source)