A5065313523- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Liquid Crystal Research Advancements
- Optical Coatings and Gratings
- Thermal Radiation and Cooling Technologies
- Polydiacetylene-based materials and applications
- Advanced Optical Imaging Technologies
- Orbital Angular Momentum in Optics
- Nanomaterials and Printing Technologies
- Antenna Design and Analysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanofabrication and Lithography Techniques
- Optical Wireless Communication Technologies
- Photonic and Optical Devices
- Nonlinear Optical Materials Studies
- Surface Modification and Superhydrophobicity
- Random lasers and scattering media
- Building Energy and Comfort Optimization
- Advanced Materials and Mechanics
- Urban Heat Island Mitigation
- Quantum optics and atomic interactions
- Advanced Fiber Optic Sensors
- Advanced Thermodynamics and Statistical Mechanics
Pohang University of Science and Technology
2019-2025
Ajou University
2022
Government of the Republic of Korea
2020
Korea Institute of Ceramic Engineering and Technology
2013
Metasurface-generated holography has emerged as a promising route for fully reproducing vivid scenes by manipulating the optical properties of light using ultra-compact devices. However, achieving multiple holographic images single metasurface is still difficult due to capacity limit meta-atom. In this work, an inverse design method based on gradient-descent optimization presented encode pieces information into metasurface. The proposed allows single-cell metasurfaces without need complex...
Abstract Transparency is an important characteristic in practical applications of radiative cooling, but the transmitted sunlight trapped inner space generally main cause increasing temperature. A transparent cooler that can lower a temperature during daytime by transmitting visible light, reflecting near‐infrared (NIR) and radiating thermal energy through atmospheric window proposed. In contrast to selective emitters transmit most incoming solar irradiance under direct opaque coolers...
Abstract Metasurface holography, the reconstruction of holographic images by modulating spatial amplitude and phase light using metasurfaces, has emerged as a next‐generation display technology. However, conventional fabrication techniques used to realize metaholograms are limited their small patterning areas, high manufacturing costs, low throughput, which hinder practical use. Herein, efficiency hologram one‐step nanomanufacturing method with titanium dioxide nanoparticle‐embedded‐resin,...
Abstract The application of hydrogels in nanophotonics has been restricted due to their low fabrication feasibility and refractive index. Nevertheless, elasticity strength are attractive properties for use flexible, wearable-devices, swelling characteristics response the relative humidity highlight potential tunable nanophotonics. We investigate nanostructured polyvinyl alcohol (PVA) using a one-step nanoimprinting technique erasable optical security metasurfaces with multiplexed structural...
Abstract The spin Hall effect of light refers to a spin-dependent transverse splitting at planar interface. Previous demonstrations enhance the have suffered from exceedingly low efficiency. Achievements large with high efficiency been reported in microwave, but those optical regime remain elusive. Here, an approach attain near-infrared is proposed and experimentally demonstrated 800 nm by using dielectric metasurface. Modulation complex transmission metasurface leads shifts that reach 10 λ...
Metasurfaces have opened the door to next-generation optical devices due their ability dramatically modulate electromagnetic waves at will using periodically arranged nanostructures. However, metasurfaces typically static responses with fixed geometries of nanostructures, which poses challenges for implementing transition technology by replacing conventional components. To solve this problem, liquid crystals (LCs) been actively employed designing tunable adjustable birefringent in real time....
Abstract Metalenses have revolutionized optical technologies with their superior ability to manipulate light and the potential replace conventional, bulky components. However, commercialization is hindered by limitations in conventional manufacturing techniques, such as small patterning areas, low throughput, high cost. In this study, two methods are introduced for scalable wafer‐scale of metalenses operating near‐infrared region, aimed at overcoming abovementioned challenges. The first type...
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...
Hyperbolic metamaterials, horizontally stacked metal and dielectric multilayer, have recently been studied as a platform to observe optical spin Hall effect. However, the large effect in horizontal hyperbolic metamaterials accompanies extremely low transmission, which obstructs its practical applications. Reducing sample thickness augment transmission causes diminishment of In this Article, we demonstrate that vertical metamaterial can enhance by several orders magnitude comparison...
Abstract The high refractive index of hydrogenated amorphous silicon (a‐Si:H) at optical frequencies is an essential property for the efficient modulation phase and amplitude light. However, substantial loss represented by its extinction coefficient prevents it from being utilized widely. Here, bonding configurations a‐Si:H are investigated, in order to manipulate produce a material that competitive with conventional transparent materials, such as titanium dioxide gallium nitride. This...
Abstract Metasurfaces consisting of subwavelength structures, so‐called meta‐atoms, have steadily attracted considerable attention for advanced holography due to their advantages in terms high‐resolution holographic images, large field view, and compact device volume. In contrast conventional displays using bulky diffractive optical elements, metasurface enables arbitrary complex wavefront shaping with a much smaller footprint. this review, we classify according the meta‐atom design...
This paper presents design and simulation of a switchable radiative cooler that exploits phase transition in vanadium dioxide to turn on off response temperature. The consists an emitter solar reflector separated by spacer. the play role emitting energy mid-infrared blocking incoming ultraviolet near-infrared regime, respectively. Because doped at room temperature, radiates its thermal only when temperature is above feasibility cooling simulated using real outdoor conditions. We confirme can...
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)...
Metalenses comprised of artificial subwavelength structures known as meta-atoms have demonstrated abilities beyond conventional bulky optical components by modulating the phase, amplitude, and polarization light in an ultrathin planar form factor. In this Tutorial, we present fundamental principles practical design procedures to exploit metalenses, including achromaticity, high numerical aperture, tunability. The include both plasmonic dielectric meta-atoms, which require different physics...
Abstract The spin Hall effect of light (SHEL) is the microscopic splitting into two circular polarizations at optical interface along perpendicular direction. With advent metamaterials/metasurfaces and their fast‐developing applications, SHEL has been garnering significant scientific interest. Here, principle recent developments in research reviewed. A theoretical description provided, including formalism general techniques. Also, studies on applications are extensively reviewed, enhancement...
The high refractive indexes and low optical losses of dielectrics are preferred for designing highly efficient metasurfaces with unprecedented wavefront control such as near-unity numerical aperture metalenses wide-angle beam spreading. Regardless intuitive material selections, the correlation between metasurface performance properties has not been clearly defined. Notwithstanding unclear correlation, intensity ratio manipulated light to input beam, often called efficiency, is an important...
Advancements in micro/nanofabrication have enabled the realization of practical micro/nanoscale photonic devices such as absorbers, solar cells, metalenses, and metaholograms. Although performance these has been improved by enhancing design flexibility structural materials through advanced fabrication methods, achieving large-area high-throughput tiny remains a challenge. In this aspect, various technologies investigated for realizing mass production consisting micro/nanostructural...
Abstract Humidity‐responsive structural coloration is actively investigated to realize real‐time humidity sensors for applications in smart farming, food storage, and healthcare management. Here, humidity‐tunable nano pixels are with a 700 nm resolution that demonstrates full standard RGB (sRGB) gamut coverage millisecond‐response time. The color designed as Fabry–Pérot (F–P) etalons which consist of an aluminum mirror substrate, humidity‐responsive polyvinyl alcohol (PVA) spacer, top layer...