A5003941707- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Liquid Crystal Research Advancements
- Plasmonic and Surface Plasmon Research
- Advanced Materials and Mechanics
- Advanced Optical Imaging Technologies
- Nanofabrication and Lithography Techniques
- Antenna Design and Analysis
- Orbital Angular Momentum in Optics
- Optical Wireless Communication Technologies
- Semiconductor Lasers and Optical Devices
- Random lasers and scattering media
- Advancements in Photolithography Techniques
- Photocathodes and Microchannel Plates
- Near-Field Optical Microscopy
- Nanomaterials and Printing Technologies
- Acoustic Wave Resonator Technologies
- Thermal Radiation and Cooling Technologies
- Microwave and Dielectric Measurement Techniques
- Quantum Electrodynamics and Casimir Effect
- Nonlinear Optical Materials Studies
- solar cell performance optimization
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
Pohang University of Science and Technology
2021-2025
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...
The efficiency of traditional solar cells is constrained due to the Shockley-Queisser limit, circumvent this theoretical concept thermophotovoltaics (STPVs) has been introduced. typical design an STPV system consists a wideband absorber with its front side facing sun. back physically attached selective emitter low-bandgap photovoltaic (PV) cell. We demonstrate consisting and pair achieving high absorptance radiation within range 400-1500 nm (covering visible infrared regions), whereas...
Abstract Symmetric spin–orbit interaction (SOI)‐based approaches apply a practical limit on helicity multiplexed metaoptics, i.e., center symmetric information encoding. Contrarily, asymmetric SOI's based the combination of geometric and propagation phase‐delay can effectively address such limitations for multifunctional metaoptics cost design complexities. In this paper, simple SOI‐based technique is realized employing only single unit cell, breaking conventional tradeoff between complexity...
Abstract Next‐generation holographic displays have promising applications in medical science, augmented/virtual reality, smart security, data encryption, etc. Although metasurfaces emerged as the suitable choice to provide compact displays, multifunctionality at broadband optical wavelengths is inevitable for abovementioned applications. Here, a metasurface demonstrated based on chiral structures introduce terms of multiple wavefront information depending upon polarization incident light....
Metasurfaces have shown remarkable potential to manipulate many of light's intrinsic properties, such as phase, amplitude, and polarization. Recent advancements in nanofabrication technologies persistent efforts from the research community result realization highly efficient, broadband, multifunctional metasurfaces. Simultaneous control these characteristics a single-layered metasurface will be an apparent technological extension. Here, we demonstrate broadband platform with unprecedented...
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 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...
In the field of nanophotonics, metasurfaces have come to forefront in real‐world applications, owing their accessible exotic optical properties that can be readily designed and fabricated using currently available techniques. The subwavelength dimensions lightweight characteristics are attractive qualities for miniaturization devices already exploited rival, sometimes even outperform, conventional bulky optics. Over past decade, ample research has been undertaken produce high‐performance...
Multi-functional metasurfaces have attracted great attention due to the significant possibilities realize highly integrated and ultra-compact meta-devices. Merging nano-printing holographic information multiplexing is one of effective ways achieve multi-functionality, such a merger can increase encoding capacity. However, current approaches rely on stacking layers interleaving, where multiple resonators effectively combine different functionalities cost efficiency, design complexity,...
Abstract Futuristic holographic displays will essentially require broadband chiro‐optical effects for medical imaging, virtual reality, smart security, and optical encryption. However, conventional metasurfaces cannot provide such on‐chip realization of effects. Moreover, the simultaneous conversion amplitude, polarization, phase (APP) at wavelengths to introduce giant chirality has not been realized yet. In this paper, a planar all‐dielectric metasurface is proposed incorporating extra...
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 Nanoimprint lithography (NIL) has attracted attention recently as a promising fabrication method for dielectric metalenses owing to its low cost and high throughput, however, aspect ratio (HAR) nanostructures are required manipulate the full 2π phase of light. Conventional NIL using hard-polydimethylsiloxane (h-PDMS) mold inevitably incurs shear stress on which is inversely proportional surface area parallel direction detachment. Therefore, HAR structures subjected larger stresses,...
Metalenses have the potential to revolutionize optical devices into next generation of consumer devices. Through new inventive strategies, metalenses with advanced functionalities been released integrate multiple responses a single flat device. Here, we design that are sensitive incident spin angular momentum provide three distinct modes based on handedness and transmitted light. Propagation phase is employed encode hyperbolic lens metalens, while geometric exploited for additional...
Abstract Optical metasurfaces consisting of two-dimensional nanostructures have rapidly developed over the past two decades thanks to their potential for use as optical components, such metalenses or metaholograms, with ultra-compact form factors. Despite these rapid developments, major challenges commercialization still remain: namely mass production and in real-life devices. A lot effort has been made overcome limitations electron beam lithography which is commonly used fabricate...
Abstract A chiral meta‐optics platform that incorporates hologram‐multiplexing with low phase distortion and wide‐incident angle tolerance over the broad spectral range of ultraviolet‐visible (UV–vis) regimes holds great potential for photonic‐encryption‐based applications, particularly in next‐generation 3D displays, high‐resolution biomedical imaging, holographic anti‐counterfeiting labeling, multi‐channel optical communication. However, design incorporating giant chirality from UV–vis...
Abstract Extracting the desired information from sensor data with various internal and external effects is a significant challenge in applications. Difficult‐to‐control factors such as temperature, humidity, sample position can significantly affect stability reliability of data. In this paper, deep learning‐based glucose sensing method that robust to variations proposed. It shown measured by designed split ring resonator‐based microwave sensor. Then, artificial neural network 1D...
Advances in augmented reality and virtual platforms have sparked interest high-performance metasurface color filters with elevated resolution, saturation, durability. However, the predominant use of either dielectrics or metals prevents realization efficient “transmissive” for displays. Here, we propose a novel, to our knowledge, approach combining dielectric metallic components, optimizing complex structures using inverse design height restrictions on layers red, green, blue. The optimized...