• Title/Summary/Keyword: Optical transparency

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Dark Resonance and Its Potential Applications: High-Resolution Spectroscopy

  • Ham, Byoung-Seung
    • Journal of the Optical Society of Korea
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    • v.5 no.3
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    • pp.110-116
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    • 2001
  • Recently observed dark resonance phenomena is solids are reviewed and discussed for potential applications to high-resolution coherence spectroscopy. in an inhomogeneously broadened system, a new type of high-resolution spectroscopy based on electromagnetically induced transparency is demonstrated.

Peak-to-zero modulation of optical absorption via electrically controllable quantum interference

  • Lee, Byoung-Ho;Kim, Kyoung-Youm
    • Journal of the Optical Society of Korea
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    • v.6 no.2
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    • pp.33-36
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    • 2002
  • We propose a modulation scheme of optical absorption in a coupled asymmetric quantum well (QW) structure via electrically controllable quantum interference. It is based on the parallel-perpendicular energy coupling effect. We show that by applying an external electric Held in the parallel direction (to the QW layers), we can obtain a maximum (peak-type) absorption at a specific wavelength where absorption cancellation would occur due to electrically induced transparency without such an external Held .

Preparation and Characterization of Flexible Optical Composite Films Based on Bragg-Structured Interferometer

  • Um, Sungyong;Sohn, Honglae
    • Journal of Integrative Natural Science
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    • v.6 no.4
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    • pp.244-250
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    • 2013
  • Three types of functionalized flexible optical composite films based on Bragg structure porous silicon interferometer have been successfully fabricated by casting a toluene solution of polystyrene onto the free-standing porous silicon. The optical properties of composite films are measured. Surface functionalization of porous silicon is determined by FT-IR measurement. Reflectance and transparence properties of composite films are measured for the possible application of tunable optical filter and indicate that the transmission peak occurred at the identical location where the reflection peak appeared.

Electrical and Optical Property of Single-Wall Carbon Nanotubes Films (단일벽 탄소나노튜브 필름의 전기적 및 광학적 특성)

  • Oh, Dong-Hoon;Kang, Young-Jin;Jung, Hyuck;Song, Hye-Jin;Cho, You-Suk;Kim, Do-Jin
    • Korean Journal of Materials Research
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    • v.19 no.9
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    • pp.488-493
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    • 2009
  • Thin films of single-wall carbon nanotubes (SWNT) with various thicknesses were fabricated, and their optical and electrical properties were investigated. The SWNTs of various thicknesses were directly coated in the arc-discharge chamber during the synthesis and then thermally and chemically purified. The crystalline quality of the SWNTs was improved by the purification processes as determined by Raman spectroscopy measurements. The resistance of the film is the lowest for the chemically purified SWNTs. The resistance vs. thickness measurements reveal the percolation thickness of the SWNT film to be $\sim$50 nm. Optical absorption coefficient due to Beer-Lambert is estimated to be $7.1{\times}10^{-2}nm^{-1}$. The film thickness for 80% transparency is about 32 nm, and the sheet resistance is 242$\Omega$/sq. The authors also confirmed the relation between electrical conductance and optical conductance with very good reliability by measuring the resistance and transparency measurements.

Electromagnetically Induced Transparency with Hyperfine Structure (사다리형 전자기 유도 투과에서의 초미세 구조)

  • Moon, Han-Sub;Lee, Rim;Lee, Won-Kyu;Seo, Ho-Sung;Kim, Joong-Bok
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.02a
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    • pp.206-207
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    • 2003
  • 전자기 유도 투과(electromagnetically induced transparency ; EIT)는 원자의 공명 진동수를 갖는 조사광이 원자 매질을 통과할 때, 강한 결합광에 의한 효과로 매질에 흡수되지 않고 투과하는 양자 간섭 효과로써 원자결맞음 현상의 가장 대표적인 현상 중의 하나이다. EIT 현상은 Boller 등에 의해서 고출력 펄스 레이저를 이용하여 Strontium 증기에서 처음 관측된 이후, 여러 가지 원자와 분자의 증기 셀, 원자 빔, 고체, 냉각된 원자, 그리고 BEC(Bose Einstein condensate)상태에서 다양한 연구들이 이루어지고 있다. (중략)

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Technical Trends of Metal Nanowire-Based Electrode (금속 나노와이어 기반 전극 기술 개발 동향)

  • Shin, Yoo Bin;Ju, Yun Hee;Kim, Jong-Woong
    • Journal of the Microelectronics and Packaging Society
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    • v.26 no.4
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    • pp.15-22
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    • 2019
  • Metallic nanowires (MNWs) have recently been considered as one of the most promising candidates for flexible electrodes of advanced electronics including wearable devices, electronic skins, and soft robotics, since they have high aspect ratio in physical shape, low percolation threshold, high ductility and optical transparency. Herein, we review the latest findings related to the MNWs and discuss the properties and potentials of this material that can be used in implementation of various advanced electronic devices.

Study on the Diameter-Controlled Synthesis of Silver Nanofibers and Their Application to Transparent Conductive Electrodes (은 나노섬유의 직경제어 합성 및 투명전극 응용 연구)

  • Lee, Young-In
    • Korean Journal of Materials Research
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    • v.25 no.10
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    • pp.537-542
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    • 2015
  • One-dimensional (1D) silver nanostructures, which possess the highest conductivity among all room-temperature materials, moderate flexibility and high transmittance, are one of the most promising candidate materials to replace conventional indium tin oxide transparent electrodes. However, the short length and large diameter of 1D silver nanostructures cause a substantial decrease in the optical transparency or an increase in the sheet resistance. In this work, ultra-long silver nanofiber networks were synthesized with a low-cost and scalable electrospinning process, and the diameter of the nanofibers were finetuned to achieve a higher aspect ratio. The decrease in the diameter of the nanofibers resulted in a higher optical transparency at a lower sheet resistance: 87 % at $300{\Omega}/sq$, respectively. It is expected that an electrospun silver nanofiber based transparent electrode can be used as a key component in various optoelectronic applications.