A5069395270- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Orbital Angular Momentum in Optics
- Advanced Optical Imaging Technologies
- Antenna Design and Analysis
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Interactive and Immersive Displays
- Optical Wireless Communication Technologies
- Optical Coatings and Gratings
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Virtual Reality Applications and Impacts
- Electromagnetic Scattering and Analysis
- Optical Network Technologies
- Tactile and Sensory Interactions
- Liquid Crystal Research Advancements
Seoul National University
2016-2025
Stanford University
2023-2025
Government of the Republic of Korea
2017-2020
Seoul Institute
2017
Abstract Recently, metasurfaces composed of artificially fabricated subwavelength structures have shown remarkable potential for the manipulation light with unprecedented functionality. Here, we first demonstrate a metasurface application to realize compact near-eye display system augmented reality wide field view. A key component is see-through metalens an anisotropic response, high numerical aperture large aperture, and broadband characteristics. By virtue these high-performance features,...
Reconstruction of light profiles with amplitude and phase information, called holography, is an attractive optical technology various significant applications such as three-dimensional imaging data storage. Subwavelength spatial control both essential requirement for ideal hologram. However, traditional holographic devices suffer from their restricted capabilities incomplete modulation in visible light; this results sacrifice information undesirable occurrences critical noises images....
Emerging spatial computing systems seamlessly superimpose digital information on the physical environment observed by a user, enabling transformative experiences across various domains, such as entertainment, education, communication and training
Advances in imaging technologies have led to a high demand for ultracompact, high-resolution image sensors. However, color filter-based sensors, now miniaturized deep submicron pixel sizes, face challenges such as low signal-to-noise ratio due fewer photons per and inherent efficiency limitations from filter arrays. Here, we demonstrate freeform metasurface router that achieves ultracompact sizes while overcoming the of conventional architectures by splitting focusing visible light instead...
A novel method to launch finite power Airy beams based on a metasurface is presented. By tailoring the amplitude and phase of transmitted fields from metallic C‐aperture array, launching achieved in free space. The beam profile can be mapped tailored by tuning only tilt angles aperture. This structure has multifrequency characteristics, which facilitates steering because trajectory dependent wavelength. In addition, design generate have very compact main lobe (≈2 µm). Computational...
Abstract Spiral phase contrast imaging offers an excellent opportunity to observe non‐labeled biological samples with slight variations in refractive index or thickness. However, the overall system covering previous works is still complex and bulky, hindering miniaturization compatibility conventional systems. Furthermore, high‐resolution imaging, particularly for observing specimens such as cellular structures, requires several optical elements like objectives relay optics which...
Abstract Broadband‐operating active devices within a small‐footprint are highly on demand in various nanophotonic fields such as fiber‐optic communication systems and chip‐based integrated optical circuits. As pioneering approaches, diverse platforms of metasurfaces (AMs) have been proposed due to their superior tunable functionality ultra‐compact size. However, most previous researches provide only limited operating bandwidth because they generally rely resonant light–matter interaction...
Since Leith and Upatnieks demonstrated the first optical hologram in 1964, technology has attracted a great deal of interest wide range fields owing to its potential use future applications such as holographic imaging data storage. Although there have been considerable efforts develop technologies using conventional optics, critical issues still hinder development. Recently, metasurfaces composed artificially fabricated subwavelength structures considered novel devices that show an...
Abstract An augmented reality (AR) near-eye display using Pancharatnam-Berry (PB) phase lenses is proposed. PB provide different optical effects depending on the polarization state of incident light. By exploiting this characteristic, it possible to manufacture an AR combiner with a small form factor and large numerical aperture value. The adopted in proposed system operates as convex lens for right-handed circularly polarized light transparent glass left-handed merging screen, such...
Abstract Metasurfaces have received enormous attention thanks to their unique ability modulate electromagnetic properties of light in various frequency regimes. Recently, exploiting its fabrication ease and modulation strength, unprecedented controlling that surpasses conventional optical devices has been suggested studied a lot. Here, this paper, we discuss some parts trend including holography, imaging application, dispersion control, multiplexing, mostly operating for regime. Finally,...
Abstract Meta‐holograms have been investigated widely because of their capabilities that are not feasible in conventional holograms, such as full‐color, broadband, and bifacial image generation performance. In particular, a high degree freedom designing meta‐atoms provides opportunities to multiplex holograms by using light properties, angle, polarization, wavelength. However, further development techniques for meta‐holograms recording multiple wavefronts is still necessary expand the amount...
Abstract Polarization is one of the fundamental properties light, which inherited from vectorial nature electromagnetic waves. Measuring states polarizations (SOPs) widely used for remote sensing applications. A number ultracompact polarimeters that analyze SOPs at a single detection without splitting incident beams have been demonstrated recently. However, development broadband polarimeter remains challenging due to resonant feature their building blocks. Here, an retrieves SOP light with...
Slim cameras are essential in state-of-the-art consumer electronics such as smartphones or augmented/virtual reality devices. However, reducing the camera thickness faces challenges primarily due to thick lens systems. Current systems, composed of stacked refractive lenses, fundamentally constrained from becoming thinner presence empty spaces between lenses and excessive volume each lens. Here, we present a system using metasurface folded optics overcome these pervasive issues. In our...
Abstract End‐to‐end optimization of metalens and artificial intelligence‐driven image restoration algorithms has recently emerged as a powerful tool for realizing ultra‐compact imaging systems. However, the limited quality existing approaches remains challenging in meeting demand commercial devices due to severe aberrations exhibited by metalens. These results highly blurred sensor images, creating substantial challenges accurate restoration. In this work, novel meta‐imager is introduced...
We propose and investigate a metallic Fresnel zone plate (FZP/MFZP) implemented on silver-coated optical fiber facet for super-variable focusing of light, the focal point which can be drastically relocated by varying wavelength incident light. numerically show that when its nominal length is set to 20 μm at 550 nm, effective tuned ~13.7 300-nm change in visible range. This tuning sensitivity over times higher than conventional silica-based spherical lens. Even with such high respect change,...
Abstract Optical metasurfaces have attracted considerable attention thanks to their unprecedented ability control the electromagnetic properties of light in subwavelength scale. These metasurface‐integrated devices not only merit compact form factor but also exhibit some better performance comparison with conventional bulk optic devices. In this work, a novel metasurface that enables full‐space is realized, offering an unconventional functionality provides new foothold for integration...
Abstract Since the surface plasmon polariton (SPP) has received a great deal of attention because its capability guiding light within subwavelength scale, finding methods for arbitrary SPP field generation been significant issue in area integrated optics. To achieve such goal, it will be necessary to generate plasmonic complex field. In this paper, we propose novel method generating propagating with curvatures by using double‐lined distributed nanoslits. As unit cell, two facing nanoslits...
Methods for multiplexing surface plasmon polaritons (SPPs) have been attracting much attention due to their potentials plasmonic integrated systems, holography, and optical tweezing. Here, using closely-distanced distributed nanoslits, we propose a method generating polarization-multiplexed SPP phase profiles which can be applied implementing general distributions. Two independent types of generation mechanisms - polarization-independent polarization-reversible ones are combined generate...
One of the most important research topic in optics and photonics is design metasurfaces to substitute conventional optical elements that demonstrate unprecedented merits terms performance form factor. In this context, full-space control makes it possible manipulate scattered light transmission reflection spaces simultaneously, proposed as next-generation scheme optics, with a potential for applications such 360° holographic images novel systems. However, previously designed lacked...
The development of a metasurface lens, which represents flat optical element with subwavelength thickness, holds the potential for miniaturizing imaging systems. Nevertheless, presence aberrations poses significant challenge achieving optimal quality out it. Moreover, its practical utilization in cameras and wearable devices necessitates simultaneous correction monochromatic chromatic aberrations. We here propose framework to design multi-layered, dispersion-engineered metasurfaces, is...
Abstract The modulation of near-field signals has recently attracted considerable interest because demands for the development nano-scale optical devices that are capable overcoming diffraction limit light. In this paper, we propose a new type tuneable plasmonic lens permits foci surface plasmon polariton (SPP) to be continuously steered by adjusting input polarization state. proposed structure consists multi-lined nanoslit arrays, in which each array is tilted at different angle provide...
We introduce a holographic augmented reality system using inverse-designed metasurface gratings and artificial-intelligence-driven holography algorithms. These elements are jointly designed to enable high quality, full-color, 3D from compact device form factor. Full-text article not available; see video presentation
We propose a scheme for directional beam switching from line-envelope tilted nanoslit array surrounded by gratings. The composed of double arrays nanoslits can be utilized launching surface plasmon polaritons (SPPs). On the left and right side array, metallic gratings are asymmetrically carved in order to design diffracted lights different beaming angles according incident polarization states. Both numerical experimental results verify that proposed structure follow diffraction theory...