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Complete amplitude and phase control of light using broadband holographic metasurfaces
Lee, Gun-Yeal,Yoon, Gwanho,Lee, Seung-Yeol,Yun, Hansik,Cho, Jaebum,Lee, Kyookeun,Kim, Hwi,Rho, Junsuk,Lee, Byoungho The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.9
<P>Reconstruction of light profiles with amplitude and phase information, called holography, is an attractive optical technology with various significant applications such as three-dimensional imaging and optical data storage. Subwavelength spatial control of both amplitude and phase of light is an essential requirement for an ideal hologram. However, traditional holographic devices suffer from their restricted capabilities of incomplete modulation in both amplitude and phase of visible light; this results in sacrifice of optical information and undesirable occurrences of critical noises in holographic images. Herein, we have proposed a novel metasurface that is capable of completely controlling both the amplitude and phase profiles of visible light independently with subwavelength spatial resolution. The full, continuous, and broadband control of both amplitude and phase was achieved using X-shaped meta-atoms based on the expanded concept of the Pancharatnam-Berry phase. The first experimental demonstrations of the complete complex-amplitude holograms with subwavelength definition at visible wavelengths were achieved, and excellent performances with a remarkable signal-to-noise ratio as compared to those of traditional phase-only holograms were obtained. Extraordinary control capability with versatile advantages of our metasurface paves a way to an ideal holography, which is expected to be a significant advancement in the field of optical holography and metasurfaces.</P>
Printed cylindrical lens pair for application to the seam concealment in tiled displays
Lee, Seunghwan,Lee, Seungjae,Yoon, Hyungsoo,Lee, Chang-Kun,Yoo, Chanhyung,Park, Jongjang,Byun, Junghwan,Kim, Geonhee,Lee, Byeongmoon,Lee, Byoungho,Hong, Yongtaek The Optical Society 2018 Optics express Vol.26 No.2
A non-reflecting metamaterial slab under the finite-embedded coordinate transformation
Lee, Il-Min,Lee, Seung-Yeol,Kim, Kyoung-Youm,Lee, Byoungho The Optical Society 2010 Optics express Vol.18 No.13
<P>Under the restrictions that the mapping functions of transformation are defined in extended two-dimensional (2D) forms and the incident waves are 2D propagating fields, the conditions for non-reflecting boundaries in a finite-embedded coordinate transformation metamaterial slab are derived. By exploring several examples, including some reported in the literatures and some novel ones developed in this study, we show that our approach can be efficiently used to determine the condition for a finite-embedded coordinate transformed metamaterial slab to be non-reflecting.</P>
Lee, Sang-Wook,Park, Seung Chul,Lim, Yongjun,Lee, Byoungho,Lee, Sin-Doo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.37
<B>Graphic Abstract</B> <P>Quasi-periodic colloidal networks are constructed on the basis of polymorphic meniscus convergence (MC) in an air-cavity-embedded, nano-colloidal system. Depending on the flow associated with the air-cavities, the colloidal particles are self-organized into nanowires through binary MC, Y-junctions through ternary MC, and X-junctions through quaternary MC. The colloidal networks in either square or hexagonal form reflect the flow symmetry according to the air-cavity deformation. <img src='wiley_img_2010/09359648-2010-22-37-ADMA201001336-content.gif' alt='wiley_img_2010/09359648-2010-22-37-ADMA201001336-content'> </P>
Analysis and Implementation of Hologram Lenses for See-Through Head-Mounted Display
Lee, Seungjae,Lee, Byounghyo,Cho, Jaebum,Jang, Changwon,Kim, Jonghyun,Lee, Byoungho IEEE 2017 IEEE photonics technology letters Vol.29 No.1
<P>We introduce an approach to implementation of see-through head-mounted displays using hologram lenses, which are categorized by holographic optical elements. The hologram lenses magnify displayed images and superimpose the magnified images on the real-world simultaneously, which allows system configuration to be compact. Here, we investigate imaging properties and optical issues of hologram lenses using the spectral analysis of light field. Also, the astigmatism of hologram lenses is analyzed and its compensation method is proposed and verified. We conclude by describing display results and a practical application of the proposed method.</P>
Dispersion characteristics of channel plasmon polariton waveguides with step-trench-type grooves.
Lee, Il-Min,Jung, Jaehoon,Park, Junghyun,Kim, Hwi,Lee, Byoungho Optical Society of America 2007 Optics express Vol.15 No.25
<P>We have studied the dispersion characteristics of single-mode channel plasmon polaritons (CPPs) with step-trench-type groove waveguides. From the numerical simulations using the finite-element method, the modal shapes and the complex propagation constants of the CPPs over a wide spectral range were obtained. It is shown that the dispersion characteristics of the step-trench-type CPP waveguide, which is composed of a step trench with a stacking nature, show an intermediate feature between the narrow and broad trenches. The results show that this configuration allows for a well-confined CPP with a moderate propagation loss at the wavelengths investigated.</P>