Gwanho Yoon
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View article: Micro-perforated acoustic metastructure for low-frequency sound absorption and ventilation
Micro-perforated acoustic metastructure for low-frequency sound absorption and ventilation Open
We present an acoustic metastructure that features a micro-perforated resonator to combine broadband sound absorption with efficient ventilation. Adjusting the perforation parameters enables micro-perforated resonators to have a range of a…
View article: Fabrication-tolerant ventilated acoustic barrier for practical implementation
Fabrication-tolerant ventilated acoustic barrier for practical implementation Open
We present a practical ventilated acoustic barrier that places discrete resonant elements at the center, reserving the surrounding region for continuous wave propagation. This inverted layout facilitates installation and reduces sensitivit…
View article: Studies on Dual Helmholtz Resonators and Asymmetric Waveguides for Ventilated Soundproofing
Studies on Dual Helmholtz Resonators and Asymmetric Waveguides for Ventilated Soundproofing Open
Achieving the simultaneity of ventilation and soundproofing is a significant challenge in applied acoustics. Ventilated soundproofing relies on the interplay between local resonance and nonlocal coupling of acoustic waves within a sub-wave…
View article: Active, Tunable, and Reconfigurable Nanophotonics
Active, Tunable, and Reconfigurable Nanophotonics Open
Nanophotonic devices composed of sub-wavelength-sized structures, including metasurfaces, have contributed to the development of bringing flat optics into reality for applications such as sensors, holographic displays, anticounterfeit labe…
View article: Studies on General Deep Neural Networks to Predict Optical Responses of Multilayered Thin Films
Studies on General Deep Neural Networks to Predict Optical Responses of Multilayered Thin Films Open
Burgeoning demand on the analysis of multilayered optical thin films yields an advent of the simulation methods to calculate the optical response of structures. Machine learning ensures expedite calculation once a model has been trained. H…
View article: Metasurface Holography Reaching the Highest Efficiency Limit in the Visible via One‐Step Nanoparticle‐Embedded‐Resin Printing
Metasurface Holography Reaching the Highest Efficiency Limit in the Visible via One‐Step Nanoparticle‐Embedded‐Resin Printing Open
Metasurface holography, the reconstruction of holographic images by modulating the spatial amplitude and phase of light using metasurfaces, has emerged as a next‐generation display technology. However, conventional fabrication techniques u…
View article: Metasurface Holography over 90% Efficiency in the Visible via Nanoparticle-Embedded-Resin Printing
Metasurface Holography over 90% Efficiency in the Visible via Nanoparticle-Embedded-Resin Printing Open
Metasurface holography, the reconstruction of holographic images by modulating the spatial amplitude and phase of light using metasurfaces, has emerged as a next-generation display technology. However, conventional fabrication techniques u…
View article: Geometric and physical configurations of meta‐atoms for advanced metasurface holography
Geometric and physical configurations of meta‐atoms for advanced metasurface holography Open
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, …
View article: Single-step manufacturing of hierarchical dielectric metalens in the visible
Single-step manufacturing of hierarchical dielectric metalens in the visible Open
Metalenses have shown a number of promising functionalities that are comparable with conventional refractive lenses. However, current metalenses are still far from commercialization due to the formidable fabrication costs. Here, we demonst…
View article: Metasurface zone plate for light manipulation in vectorial regime
Metasurface zone plate for light manipulation in vectorial regime Open
Fresnel zone plates consisting of multiple concentric rings have been realized by tailoring amplitude, phase and polarization of light, but conventional Fresnel zone plates require totally different materials to control each property reduc…
View article: Wavelength-decoupled geometric metasurfaces by arbitrary dispersion control
Wavelength-decoupled geometric metasurfaces by arbitrary dispersion control Open
Conventional multicolor metaholograms suffer from the fundamental limitations of low resolution and irreducible noise because the unit structure functionality is still confined to a single wavelength. Here, we propose wavelength-decoupled …
View article: Recent Advances in Tunable and Reconfigurable Metamaterials
Recent Advances in Tunable and Reconfigurable Metamaterials Open
Metamaterials are composed of nanostructures, called artificial atoms, which can give metamaterials extraordinary properties that cannot be found in natural materials. The nanostructures themselves and their arrangements determine the meta…
View article: Outfitting Next Generation Displays with Optical Metasurfaces
Outfitting Next Generation Displays with Optical Metasurfaces Open
Optical metasurfaces, composed of ultrathin subwavelength meta-atoms, have enabled flat-optics and corresponding flat optical components such as ultrathin lenses, color filters, and absorbers. Among the plethora of applications currently a…
View article: Polarization-sensitive tunable absorber in visible and near-infrared regimes
Polarization-sensitive tunable absorber in visible and near-infrared regimes Open
A broadband tunable absorber is designed and fabricated. The tunable absorber is comprised of a dielectric-metal-dielectric multilayer and plasmonic grating. A large size of tunable absorber device is fabricated by nano-imprinting method. …
View article: Complete amplitude and phase control of light using broadband holographic metasurfaces
Complete amplitude and phase control of light using broadband holographic metasurfaces Open
An X-shaped metasurface is proposed to achieve full, continuous, and broadband control of both the amplitude and phase of visible light.
View article: Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging
Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging Open
The use of super-resolution imaging to overcome the diffraction limit of conventional microscopy has attracted the interest of researchers in biology and nanotechnology. Although near-field scanning microscopy and superlenses have improved…
View article: A Broadband Optical Diode for Linearly Polarized Light Using Symmetry‐Breaking Metamaterials
A Broadband Optical Diode for Linearly Polarized Light Using Symmetry‐Breaking Metamaterials Open
As an analog of electrical diodes, optical diodes enable asymmetric transmission or one‐way transmission of light. Here, a thin bilayer metamaterial supporting asymmetric transmission is experimentally demonstrated for linearly polarized l…