A5040926326- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Advanced Antenna and Metasurface Technologies
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Polydiacetylene-based materials and applications
- Liquid Crystal Research Advancements
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Antenna Design and Analysis
- Education and Learning Interventions
- Ferroelectric and Negative Capacitance Devices
- Molecular Junctions and Nanostructures
- Advanced Optical Imaging Technologies
- Advanced Memory and Neural Computing
- Pancreatic and Hepatic Oncology Research
- Pancreatitis Pathology and Treatment
- Random lasers and scattering media
- Advanced Fiber Optic Sensors
- Optical Wireless Communication Technologies
- Optical Coherence Tomography Applications
- Gallbladder and Bile Duct Disorders
Pohang University of Science and Technology
2018-2025
Pohang Iron and Steel (South Korea)
2024-2025
Seoul National University
2006-2022
Government of the Republic of Korea
2020
Seoul National University Hospital
2012-2016
New Generation University College
2012-2013
Abstract Vectorial holography has gained a lot of attention due to the promise versatile polarization control structured light for enhanced optical security and multi-channel communication. Here, we propose bifunctional metasurface which combines both structural color printing vectorial with eight channels towards advanced encryption applications. The colour prints are observed under white while encoded holograms reconstructed laser illumination. To encode multiple holographic images...
Abstract Flat optics, realized by the artificially created 2D material platform called optical metasurfaces, is currently undergoing a science‐to‐technology transition. However, “real‐time” active operations of such flat devices remain yet unresolved. Here, liquid crystals (LCs)‐integrated metaholograms for ultracompact dynamic holographic displays are proposed. The anisotropic nature LCs allows facile and repeatable manipulation polarization light. Specifically designed (“designer”)...
Dispersion engineering is essential to the performance of most modern optical systems including fiber-optic devices. Even though chromatic dispersion a meter-scale single-mode fiber used for endoscopic applications negligible, lenses located on end face focusing and imaging suffer from strong aberration. Here we present design nanoprinting 3D achromatic diffractive metalens fiber, capable performing polarization-insensitive across entire near-infrared telecommunication wavelength band...
The development of real-time and sensitive humidity sensors is in great demand from smart home automation modern public health. We hereby proposed an ultrafast full-color colorimetric sensor that consists chitosan hydrogel sandwiched by a disordered metal nanoparticle layer reflecting substrate. This hydrogel-based resonator changes its resonant frequency to external conditions because the hydrogels are swollen under wet state contracted dry state. response time ~10 4 faster than...
Abstract Structuring light emission from single-photon emitters (SPEs) in multiple degrees of freedom is great importance for quantum information processing towards higher dimensions. However, traditional control sources relies on the use bulky optical elements or nanostructured resonators with limited functionalities, constraining potential multi-dimensional tailoring. Here we introduce an ultrathin polarisation-beam-splitting metalens arbitrary structuring at room temperature. Owing to...
Abstract Single molecule fluorescence spectroscopy is at the heart of molecular biophysics research and most sensitive biosensing assays. The growing demand for precision medicine environmental monitoring requires creation miniaturized portable sensing platforms. However, need highly sophisticated objective lenses has precluded development single detection systems truly devices. Here, we propose a dielectric metalens device submicrometer thickness to excite collect light from fluorescent...
Nanoimprint lithography is gaining popularity as a cost-efficient way to reproduce nanostructures in large quantities. Recent advances nanoimprinting using high-index nanoparticles have demonstrated replication of photonic devices, but it difficult confer special properties on beyond general metasurfaces. Here, we introduce novel method for fabricating light-emitting metasurfaces lithography. By utilizing quantum dots embedded resin, successfully imprint dielectric that function...
Monolayer transition metal dichalcogenides are promising materials that not only atomically thin but also have direct bandgaps, making them highly regarded in optics and optoelectronics. However, their photoluminescence exhibits almost random polarization at room temperature. The emission is omnidirectional weak due to the low quantum yield. These limitations hamper development of practical optoelectronic devices solid-state single-photon sources for technologies. Here, we demonstrate...
Metasurfaces made up of subwavelength arrays Mie scatterers can be engineered to control the optical properties incident light. The hybridization fundamental resonances with lattice greatly enhances scattering cross-section individual scatterers. Through careful design locations these hybridized modes using two differently hydrogenated amorphous silicon nanorods, we numerically calculate and experimentally fabricate examples full color printing; one spectral colors comparable Adobe RGB...
Optical metasurfaces, composed of ultrathin subwavelength meta-atoms, have enabled flat-optics and corresponding flat optical components such as lenses, color filters, absorbers. Among the plethora applications currently attracting great interest, next generation display techniques could further benefit from metasurface technology. Thanks to relatively simple mechanisms amplitude phase modulation light by many recent research achievements in metasurfaces are related applications. In this...
Abstract A tunable Fabry–Pérot resonator is realized using metal–insulator–metal structure, in which the insulator chitosan hydrogel. The swells response to changes relative humidity; this change affects transmissive structural color of multilayer structure. This utilized for a humidity sensor combined with photovoltaic cell. current through cell provides rapid precise measurement humidity, and an approximate, remotely‐readable estimate. requires no power, so device has numerous sensing applications.
Abstract Structural coloration using metasurfaces has been steadily researched to overcome the limitations of conventional color printing pigments by improving resolution, lowering toxicity, and increasing durability. Many have demonstrated for dynamic structural convert images at visible spectrum. However, previous works cannot reach near-zero scattering when colors are turned-off, preventing it from being cryptographic applications. Herein, we propose a completely on/off switchable with...
Silicon has been utilized in metasurfaces to produce structural color filters due its compatibility with mature and cost-effective methods for complementary metal oxide semiconductor devices. In this work, we propose demonstrate efficiency- scattering-enhanced using all-dielectric made up of engineered hydrogenated amorphous silicon (a-Si:H) nanoblocks. Wavelength-dependent filtering is achieved by Mie scattering as each structure individually supports the electric dipole (ED) magnetic (MD)...
Abstract High‐quality and tunable structural color printing with feasible fabrication is a key goal in recent decades, holding the possibility for full‐color microdisplay impeccable cryptographic nanoprints. Plasmonic approach suffers from inevitable material absorption restricting spectrum suppressed lightness. Recent progress dielectric nanophotonics offers low‐loss solution rendering, but dynamic functionality still infancy of changing colors unchanged portraits, where more sophisticated...
Abstract The field of high-bandwidth holography has been extensively studied over the past decade. Orbital angular momentum (OAM) holography, which utilizes vortex beams with theoretically unbounded OAM modes as information carriers, showcases large capacitance hologram storage. However, limited to a single wavelength, restricting its potential for full-color and displays. In this study, we propose wavelength multiplexed that multiple dimensions light—wavelength OAM—to provide multi-color...
In article number 1801070, Junsuk Rho and co-workers realize polarization-encrypted nanoprints by tunable structural coloring with a combination of symmetric asymmetric nanoantennas. The designed based on Kerker's condition are decrypted under certain polarization angle incident light. demonstration the expands scope metasurfaces toward novel security technologies, thus further shows their potential for integration smartphone applications or variety Internet-of-Things technologies.
Generating colors by employing metallic nanostructures has attracted intensive scientific attention recently, because one can easily realize higher spatial resolution and highly robust compared to conventional pigment. However, since the scattering spectra thereby resultant are determined nanostructure geometries, only fixed color be produced design a whole new sample is required generate different color. In this paper, we demonstrate active metasurface, which shows range of dependent on...
The hybridised resonances between Mie-scatterers and lattice resonances, i.e. quasi-guided mode are investigated. scattering of the Mie-resonators is improved by first order transmitted diffracted light which coupled to formed Mie-resonators. conditions coupling dependent on refractive index substrate effective unit cell resonators. Based momentum matching conditions, cut-off wavelength amount amplification can be controlled. As a proof-of-concept application this framework, gallium nitride...