A5029026144- Metamaterials and Metasurfaces Applications
- Polydiacetylene-based materials and applications
- Photonic Crystals and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Materials and Mechanics
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Liquid Crystal Research Advancements
- Antenna Design and Analysis
- Plasmonic and Surface Plasmon Research
- Advanced Wireless Communication Technologies
- Optical Wireless Communication Technologies
- Nanomaterials and Printing Technologies
- Advanced Antenna and Metasurface Technologies
- Semiconductor Lasers and Optical Devices
Pohang University of Science and Technology
2022-2025
Metasurface-driven optical encryption devices have attracted much attention. Here, we propose a dual-band vectorial metahologram in the visible and ultraviolet (UV) regimes for encryption. Nine polarization-encoded holograms are observed under UV laser illumination, while another independent hologram appears illumination. The proposed engineered silicon nitride, which is transparent UV, employed to demonstrate hologram. holographic images different polarization states encoded using pixelated...
Abstract Conventional photonic devices exhibit static optical properties that are design-dependent, including the material’s refractive index and geometrical parameters. However, they still possess attractive responses for applications already exploited in across various fields. Hydrogel photonics has emerged as a promising solution field of active by providing primarily deformable geometric parameters response to external stimuli. Over past few years, studies have been undertaken attain...
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...
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...
Humidity-sensitive structural color has emerged as a promising technology due to its numerous advantages that include fast response, intuitiveness, stand-alone capability, non-toxicity, well resistance thermal and chemical stresses. Despite immense technological advancements, these colors lack the ability present independent multiple images through transformation. Herein, we an approach address this constraint by introducing chemically geometrically programmable photoreactive polymer which...
Abstract In optical wireless communication (OWC), the adaptability of infrared and visible spectra is attracting growing interest. These technologies are promising solutions for various real‐world applications, including indoor, underwater, vehicular, IoT systems. However, conventional OWC systems constrained by their bulky structures fixed properties, which limit ability to provide on‐demand services integrate with on‐chip technologies. Therefore, demand ultrathin, reconfigurable devices...
Abstract A reconfigurable intelligent surface (RIS), a leading‐edge technology, represents new paradigm for adaptive control of electromagnetic waves between source and user. While RIS technology has proven effective in manipulating radio frequency using passive elements such as diodes MEMS, its application the optical domain is challenging. The main difficulty lies meeting key performance indicators, with most critical being accurate self‐adjusting positioning. This work presents an...