• Title/Summary/Keyword: optical manipulation

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EVOLUTION OF TRANSMISSION LOSS AND STRUCTURE IN EPOXY CURING

  • Song Hyeon-Hun;Park Jong-Hui;No Geun-Ae
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.10a
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    • pp.280-282
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    • 1998
  • Communications, data storage or computation by manipulating the optical signals have the strong advantages over the traditional electronic circuits in regard to the data handling speed and capacity. Effective manipulation of the optical signals, however, requires materials of large nonlinear coefficients and of fast response time. Polymeric materials are one of the promising materials to meet the requirements for nonlinear optical (NLO) materials. (omitted)

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A new approach to reduce the computation time of Genetic Algorithm for computer- generated holograms (CGH 생성을 위한 유전알고리즘의 최적화 시간단축)

  • Nguyen The Anh;An Jun Won;Choe Jae Gwang;Kim Nam
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.02a
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    • pp.242-243
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    • 2003
  • A CGH is a hologram generated by computer. It is widely applied to wavefront manipulation, synthesis, optical information processing and interferometer. Some methods have been used to determine the optimum phase pattern to achieve high diffraction efficiency and uniform intensity such as DBS (Direct Binary Search), SA (Simulated Annealing), GA(Genetic Algorithm). These methods require long computation time to generate a hologram. (omitted)

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Multi-Functional Probe Recording: Field-Induced Recording and Near-Field Optical Readout

  • Park, Kang-Ho;Kim, Jeong-Yong;Song, Ki-Bong;Lee, Sung-Q;Kim, Jun-Ho;Kim, Eun-Kyoung
    • ETRI Journal
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    • v.26 no.3
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    • pp.189-194
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    • 2004
  • We demonstrate a high-speed recording based on field-induced manipulation in combination with an optical reading of recorded bits on Au cluster films using the atomic force microscope (AFM) and the near-field scanning optical microscope (NSOM). We reproduced 50 nm-sized mounds by applying short electrical pulses to conducting tips in a non-contact mode as a writing process. The recorded marks were then optically read using bent fiber probes in a transmission mode. A strong enhancement of light transmission is attributed to the local surface plasmon excitation on the protruded dots.

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Applications of Digital Holography in Biomedical Microscopy

  • Kim, Myung-K.
    • Journal of the Optical Society of Korea
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    • v.14 no.2
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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.

Ultrahuge Light Intensity in the Gap Region of a Bowtie Nanoantenna Coupled to a Low-mode-volume Photonic-crystal Nanocavity

  • Ebadi, Nassibeh;Yadipour, Reza;Baghban, Hamed
    • Current Optics and Photonics
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    • v.2 no.1
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    • pp.85-89
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    • 2018
  • This paper presents a new, efficient hybrid photonic-plasmonic structure. The proposed structure efficiently and with very high accuracy combines the resonant mode of a low-mode-volume photonic-crystal nanocavity with a bowtie nanoantenna's plasmonic resonance. The resulting enormous enhancement of light intensity of about $1.1{\times}10^7$ in the gap region of the bowtie nanoantenna, due to the effective optical-resonance combination, is realized by subtle optimization of the nanocavity's optical characteristics. This coupled structure holds great promise for many applications relying on strong confinement and enhancement of optical field in nanoscale volumes, including antennas (communication and information), optical trapping and manipulation, sensors, data storage, nonlinear optics, and lasers.

Separation of Neutral Molecules by the Dipole Force of a Focused Nonresonant Laser Pulse (집광된 비공명레이저펄스의 쌍극자힘에 의한 중성 분자들의 분리)

  • Zhao, Bum-Suk;Lee, Sung-Hyup. Chung, Hoi-Sung;Hwang, Sun-Gu;Kang, Wee-Kyung;Chung, Doo-Soo
    • Proceedings of the Optical Society of Korea Conference
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    • 2001.02a
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    • pp.272-273
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    • 2001
  • We demonstrate the first separation of neutral molecules using optical forces. Unlike laser atomic cooling or optical tweezers, optical separation technique requires the manipulation of only one component of the molecular motion. Thus the mixtures can be separated, in principle, with less complex schemes. When an Intense nonresonant laser beam is focused onto a beam of molecules, the interaction between the laser electric field and the induced dipole moment of a molecule invokes a mechanical force on the molecule proportional to the field gradient and the molecular polarizability ($\alpha$) to mass (m) ratio $\alpha$/m. (omitted)

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Optically Actuated Carbon Nanocoils

  • Wang, Peng;Pan, Lujun;Li, Chengwei;Zheng, Jia
    • Nano
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    • v.13 no.10
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    • pp.1850112.1-1850112.6
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    • 2018
  • Optical manipulation on microscale and nanoscale structures opens up new possibilities for assembly and control of microelectromechanical systems and nanoelectromechanical systems. Static optical force induces constant displacement while changing optical force stimulates vibration of a microcantilever/nanocantilever. The vibratory behavior of a single carbon nanocoil cantilever under optical actuation is investigated. A fitting formula to describe the laser-induced vibration characteristics is deduced based on a classical continuum model, by which the resonance frequency of the carbon nanocoil can be determined directly and accurately. This optically actuated vibration method could be widely used in stimulating quasi-1D micro/nanorod-like materials, and has potential applications in micro-/nano-opto-electromechanical systems.

MEMS Technology for Biophotonic Applications (바이오포토닉스응용을 위한 MEMS 미세광학소자의 개발)

  • Jeong, Gi-Hun
    • Proceedings of the Optical Society of Korea Conference
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    • 2009.02a
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    • pp.387-388
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    • 2009
  • Biophotonics is an emerging area in a fusion of biology and photonics, especially in advanced bioimaging, optical biosensors, photomodulation, and biochip optical read-out, and optical manipulation. This emerging area also creates many opportunities for interdisciplinary study of biology and photonics. Micro-Electro-Mechanical-System(MEMS) is an attractive technology in miniaturizing sensors and actuactors. For last decade, it has contributed to the development for active and passive small and integrated optical components in optical communication. Recently, this technology is also merging into biology for high sensitive biosensing and high resolution and fast bioimaging in small form factor. In this talk, some key advantages of small optical components and recent biophotonic MEMS achievement will be discussed for miniaturized advanced biophotonic systems.

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State-of-the Art Review in Nano-Biomanipulation Technologies (나노-바이오 매니퓰레이션 기술의 현황 및 전망)

  • Kim Deok-Ho;Kim Byungkyu;Park Jong-Oh;Ju Byeong-Kwon
    • Journal of Institute of Control, Robotics and Systems
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    • v.11 no.4
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    • pp.353-362
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    • 2005
  • This article describes a state-of-the art review in nano-biomanipulation technologies. Nanomanipulation of biological objects enables an in-depth study of single molecules such as DNA and RNA, and of biophysical events at the molecular level like molecular motors. Controlled nanomanipulation is challenging but essential for precisely engineering biomolecules or cells and for manufacturing functional nano-biosystems. In this paper, we summarize several contact, non-contact and hybrid methods available for nanomanipulation of biological objects. Advantages currently available methods and their limitations are also compared. Finally, we discuss possible applications of nano-biomanipulation technologies to life science and molecular medicine including cell biology, genetic engineering, biophysics, and biochemistry.