• 한국광학회지
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• 제25권3호
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• pp.125-130
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• 2014

홀로그래피 광학소자는 투명하고 얇은 필름 또는 플라스틱 형태로 다양한 기능을 포함할 수 있는 장점을 갖고 있어 광학제품, 통신 및 디스플레이 분야에서 다양한 연구 개발이 진행되고 있다. 본 논문에서는 홀로그래피 광학소자의 원리 및 특성, 이를 활용한 회절 광학소자, 홀로그래픽 투영 스크린, HMD 등 응용시스템에 대해 소개한다. 앞으로 홀로그래피 광학소자가 좀 더 보편화되고 활용가치를 높이기 위해 풀어야 할 당면과제에 대해 설명한다.

• Journal of the Optical Society of Korea
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• 제13권4호
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• pp.406-415
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• 2009

Optical scanning holography (OSH) is a distinct digital holographic technique in that real-time holographic recording a three-dimensional (3-D) object can be acquired by using two-dimensional active optical heterodyne scanning. Applications of the technique so far have included optical scanning cryptography, optical scanning microscopy, 3-D pattern recognition, 3-D holographic TV, and 3-D optical remote sensing. This paper reviews some of the recent progress in OSH. Some possible further works are also discussed.

• Journal of the Optical Society of Korea
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• 제15권4호
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• pp.345-351
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• 2011

We present a novel approach to the holographic three-dimensional display using a liquid crystal shutter for binocular display applications. One of the difficult problems in implementing a binocular holographic three-dimensional display is the extremely narrow viewing angle. This problem is attributed to the spatial light modulator pixel number which restricts the maximum spatial bandwidth of the spatial light modulator. In our proposed method, a beam splitter and liquid crystal shutter are used to present two holograms of a three-dimensional scene to the corresponding eyes. The combination of holographic display and liquid crystal shutter can overcome the problem of the extremely narrow viewing angle, presenting threedimensional images to both eyes with correct accommodation depth cues.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.344-345
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• 2005

본 논문에서는 홀로그래피용 감광물질로서, 앞으로 가장 발전가능성이 있다고 기대되는 photopolymer에 대해서 언급하고자 한다. 홀로그램은 물체에서 방출되는 빛의 파면에 대한 정보를 기록하는 필름을 말하며 이러한 홀로그램을 이용한 기술을 홀로그래피라고 한다. 먼저 홀로그램 및 홀로그래피의 개념과 원리에 대해 서술하고 현재 사용되고 있는 홀로그래피용 감광물질인 silver-halide나 dichromatic gelatin 등에 대해 소개한다. 이와 비교하여 photopolymer가 가지는 특성과 장점을 기술하고 photopolymer를 기반으로 한 holography의 발전에 따른 차세대 holographic applications에 대해 알아본다.

• ETRI Journal
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• 제41권1호
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• pp.93-108
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• 2019

Guaranteeing interoperability between devices and applications is the core role of standards organizations. Since its first JPEG standard in 1992, the Joint Photographic Experts Group (JPEG) has published several image coding standards that have been successful in a plethora of imaging markets. Recently, these markets have become subject to potentially disruptive innovations owing to the rise of new imaging modalities such as light fields, point clouds, and holography. These so-called plenoptic modalities hold the promise of facilitating a more efficient and complete representation of 3D scenes when compared to classic 2D modalities. However, due to the heterogeneity of plenoptic products that will hit the market, serious interoperability concerns have arisen. In this paper, we particularly focus on the holographic modality and outline how the JPEG committee has addressed these tremendous challenges. We discuss the main use cases and provide a preliminary list of requirements. In addition, based on the discussion of real-valued and complex data representations, we elaborate on potential coding technologies that range from approaches utilizing classical 2D coding technologies to holographic content-aware coding solutions. Finally, we address the problem of visual quality assessment of holographic data covering both visual quality metrics and subjective assessment methodologies.

• Current Optics and Photonics
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• 제7권6호
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• pp.638-654
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• 2023

Holography is generally known as a technology that records and reconstructs 3D images by simultaneously capturing the intensity and phase information of light. Two or more interfering beams and illumination of this interference pattern onto a photosensitive recording medium allow us to control both the intensity and phase of light. Holography has found widespread applications not only in 3D imaging but also in manufacturing. In fact, it has been commonly used in semiconductor manufacturing, where interference light patterns are applied to photolithography, effectively reducing the half-pitch and period of line patterns, and enhancing the resolution of lithography. Moreover, holography can be used for the manufacturing of 3D regular structures (3D photonic crystals), not just surface patterns such as 1D or 2D gratings, and this can be broadly divided into (i) holographic recording and (ii) holographic lithography. In this review, we conceptually contrast two seemingly similar but fundamentally different manufacturing methods: holographic recording and holographic lithography. We comprehensively describe the differences in the manufacturing processes and the resulting structural features, as well as elucidate the distinctions in the diffractive optical properties that can be derived from them. Lastly, we aim to summarize the unique perspectives through which each method can appear distinct, with the intention of sharing information about this field with both experts and non-experts alike.

• Journal of the Optical Society of Korea
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• 제14권2호
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• pp.77-89
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• 2010

Digital holography (DH) is a potentially disruptive new technology for many areas of imaging science, especially in microscopy and metrology. DH offers a number of significant advantages such as the ability to acquire holograms rapidly, availability of complete amplitude and phase information of the optical field, and versatility of the interferometric and image processing techniques. This article provides a review of the digital holography, with an emphasis on its applications in biomedical microscopy. The quantitative phase microscopy by DH is described including some of the special techniques such as optical phase unwrapping and holography of total internal reflection. Tomographic imaging by digital interference holography (DIH) and related methods is described, as well as its applications in ophthalmic imaging and in biometry. Holographic manipulation and monitoring of cells and cellular components is another exciting new area of research. We discuss some of the current issues, trends, and potentials.

• 한국실내디자인학회논문집
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• 제33호
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• pp.75-82
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• 2002

Holography provides a medium for creative visual experiences in space and scale. It has been firmly established as a tool for scientific and engineering studies. It could be creatively used in interior architecture and display as a practical device and as a form of art. Basic principles and features of holography are explained. Design of the holographic systems are illustrated in some interior architectural applications. It is believed that holographic elements can make a valuable contribution to interior architecture design by controlling light and creating new concepts of colour and space.

• 한국광학회지
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• 제20권3호
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• pp.175-181
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• 2009

내부전반사 홀로그래픽 노광 기술은 넓은 면적(6")을 아주 미세하게($0.35{\mu}m$) 노광할 수 있는 차세대 광 노광 기술로서 평가받고 있다. 기존의 광 노광 기술은 $1.5{\mu}m/6}$ 이상이 가능한 (LCD용 노광기)과 $0.2{\mu}m/1.5"$ 이하(반도체용 노광기)의 패턴을 노광할 수 있도록 양분되어 발전하여 왔다. 이에 반하여 내부전반사 홀로그래픽 노광 기술은 일괄 노광 면적은 6"로 유지하면서 $0.35{\mu}m$에서 $1.5{\mu}m$의 사이의 패턴을 구현할 수 있는 특별한 능력을 갖고 있다. 이는 기존 광 노광 방식에서 반드시 필요로 하는 결상 광학계를 사용하지 않고 홀로그램 마스크를 사용하기 때문이다. 본 논문에서는 내부전반사 홀로그래픽 노광 기술의 핵심기술인 홀로그램 마스크를 표면 부조 홀로그램 형태로 구현할 수 있는 핵심 인자가 무엇인지를 분석하여 최적화 하는 방법에 대해 논하고, 이를 이용하여 노광한 미세패턴에 대한 결과를 실험적으로 평가하였다.

• KIEE International Transactions on Electrophysics and Applications
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• 제11C권3호
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• pp.75-80
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• 2001

Holographic polymer dispersed liquid crystals (HPDLCs) have fabricated by irradiating an Ar-ion laser ( ${\lambda}$=514nm) at various intensity on LC/acrylate monomer mixtures which were sandwitched between two ITO coated glass plates. Monomer systems were composed of dipentaerythritol-hydroxy penta acrylate (DPHPA, f=5)/monofunctional acrylate monofunctional monomers. The LC used in this system was E7 (BL001, Merck). Gratings were fabricated by periodic interference of twobeams. Reflection efficiency-irradiation intensity-monomer type relationships were obtained from the UV-visible spectra of the HPDLC films. Peaks were found at a bit smaller wavelength than 514nm, due to the shrinkage of mixture volume upon polymerization. Real time measurements of diffraction efficiency have been obtained according to monomer types and LC contents.