• 제목/요약/키워드: Optical materials

검색결과 4,105건 처리시간 0.037초

F-Doped SnO2 Thin Film/Ag Nanowire 이중층의 전기적 및 광학적 특성 (Electrical and Optical Properties of F-Doped SnO2 Thin Film/Ag Nanowire Double Layers)

  • 김종민;구본율;안효진;이태근
    • 한국재료학회지
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    • 제25권3호
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    • pp.125-131
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    • 2015
  • Fluorine-doped $SnO_2$ (FTO) thin film/Ag nanowire (NW) double layers were fabricated by means of spin coating and ultrasonic spray pyrolysis. To investigate the optimum thickness of the FTO thin films when used as protection layer for Ag NWs, the deposition time of the ultrasonic spray pyrolysis process was varied at 0, 1, 3, 5, or 10 min. The structural, chemical, morphological, electrical, and optical properties of the double layers were examined using X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, the Hall effect measurement system, and UV-Vis spectrophotometry. Although pure Ag NWs formed isolated droplet-shaped Ag particles at an annealing temperature of $300^{\circ}C$, Ag NWs covered by FTO thin films maintained their high-aspect-ratio morphology. As the deposition time of the FTO thin films increased, the electrical and optical properties of the double layers degraded gradually. Therefore, the double layer fabricated with FTO thin films deposited for 1 min exhibited superb sheet resistance (${\sim}14.9{\Omega}/{\Box}$), high optical transmittance (~88.6 %), the best FOM (${\sim}19.9{\times}10^{-3}{\Omega}^{-1}$), and excellent thermal stability at an annealing temperature of $300^{\circ}C$ owing to the good morphology maintenance of the Ag NWs covered by FTO thin films.

Li2O가 포함된 B2O3-SiO2-La2O3계 광학 유리 특성 (The Properties of Optical Glass of B2O3-SiO2-La2O3 System with Li2O)

  • 이지선;김세훈;김진호
    • 한국재료학회지
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    • 제32권12호
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    • pp.560-564
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    • 2022
  • In this study, lanthanum boron silicate glasses were prepared with a composition of x Li2O-(60-x)B2O3-5CaO-5BaO-7ZnO-10SiO2-10La2O3-3Y2O3 where x = 1,3,5,7, and 9 mol%. Each composition was melted in a platinum crucible under atmospheric conditions at 1,400 ℃ for 2 h. Clear glasses with a transmittance exceeding 85 % were fabricated. Their optical, thermal, and physical properties, such as refractive index, Abbe number, density, glass transition (Tg) and Knoop hardness were studied. The results demonstrated that refractive index was between 1.6859 and 1.6953 at 589.3 nm. The Abbe number was calculated using an equation for 589.3 nm (nd), 656.3 nm (nf) and 486.1 nm (nc) and was observed to be in the range from 57.5 to 62.6. As the Li2O content increased, the glass transition temperature of the optical glass decreased from 608 ℃ to 564 ℃. If glass mold pressing is performed using a material with a low transition temperature and high mechanical strength, then the optical glasses developed in this study can be completely commercialized.

Optical and electrical properties of organic light-emitting diodes with ITO and AZO base various anode configurations

  • An, Jin-Hyung;Kim, Sang-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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    • pp.1079-1081
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    • 2006
  • Optical and electrical properties of various transparent conducting oxides (ITO, AZO, ITO/Ag/ITO, AZO/Ag/AZO) were investigated for anode of OLED display. ITO/Ag/ITO multi-layer anode has much better electrical and optical characteristics than other films, and OLED on that anode showed lower threshold voltage and better luminescence.

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마이크로머시닝 기술과 MEMS 광스위치 응용 (Micromachining Technologies and its application to MEMS Optical Switch)

  • 이종현
    • 소성∙가공
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    • 제11권2호
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    • pp.103-107
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    • 2002
  • With the great demand for WDM (Wavelength Division Multiplexing) optical communications, optical switches are expected to become one of the dominant components in future networks. Conventional mechanical switches suffer from poor reliability and large size; however, many micromachined optical switches with moving mirrors have been proposed for high scale OXC (Optical Crossconnect) or ADM (Add/Drop Multiplex) because of the low power consumption and high reliability of these switches. In this paper, we introduce the technological trends of optical switches using MEMS, related micromachining technologies and their characteristics.

비선형 분산 광 전송 매질에 있어서 인접 광 솔리톤간의 신뢰도 및 최대 전송거리 분석 (Reliability and maximum transmission length analysis between adjacent optical solitons in nonlinear dispersive transmission materials)

  • 변승우;김종규;송재원
    • E2M - 전기 전자와 첨단 소재
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    • 제9권3호
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    • pp.246-250
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    • 1996
  • In optical soliton transmission systems with nonlinear dispersive materials, which is utilized for ultra-long and high bit rate transmission, it is shown that the value of initial time difference between adjacent solitons is analyzed for optimum bit rate. The method is inducted by uncorrelation condition with minimum interaction forces in initial covariance coefficient between adjacent solitons. When the initial time difference is 6 times of soliton pulse width by the results, it is shown that the reliability is maintained with more than 90% within transmission length of soliton period. multiplied by 93.

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Polymaleimide Copolymers with Norbornane units for Polymeric Optical Waveguides

  • Park, Ki-Hong;Kim, Won-Lae;Lee, Chul-Joo;Han, Kwan-Soo;Han, Hak-Soo
    • Journal of Photoscience
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    • 제9권1호
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    • pp.23-28
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    • 2002
  • In order to obtain thermal-stable, low birefringent, and low optical loss waveguiding materials, we synthesized several fluorinated poly (maleimide-co-glycidylmethacrylate)s using a pentafluorophenylmaleimide (PEM) and two kinds of methacrylate derivatives as comonomers and glycidylmethacrylate as a crosslinker. One comonomer is a linear fluorinated methacrylate (HFBM) and another is a bulky norbornane-derived methacrylate (NMMA). These copolymers could be self-crosslinked by heating due to epoxy groups of glycidylmethacrylates. As a maleimide contents increased to 50 mol%, these copolymers showed high decomposition temperatures of above 300$^{\circ}C$. The refractive index could be precisely controlled by the variation of PFM/HFBA or PFM/NMMA feed ratio in the range of 1.410∼1.508 at 643 nm. The copolymers had very low birefringence in the range of 1∼5${\times}$10$\^$-4/.

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자외선 경화형 고경도 PET 필름의 제조 및 특성 (Preparation and Properties of UV Curable Hard Coating Materials on PET)

  • 김현준
    • 반도체디스플레이기술학회지
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    • 제13권1호
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    • pp.35-41
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    • 2014
  • UV curable transparent hard coating materials have been developed to improve the mechanical and optical properties of PET substrate. The coating materials were synthesized using various urethane acrylate oligomers, monomers, photo initiators, and leveling agents. The materials were coated on PET substrates and UV cured. The hard coated PET films were shown to have the good scratch resistance and transparency. When the urethane acrylate oligomer with more functional groups was introduced into the coating solution, the mechanical and optical properties were improved. However the higher concentration of 9-functional oligomer resulted in the decrease of workability. The addition of trimethylolpropane ethoxylate$(EO/OH)_9$ triacrylate(TMPETA) to coating solution improved the workability and properties. As a result, the UV cured film from the formulation of urethane acrylate oligomer with 9-functional groups, TMPETA as a monomer, IRACURE 754 as a photo initiator and BYK-340 as a leveling agent showed the best mechanical and optical properties in this study.

Effect of a ZnO Buffer Layer on the Structural, Optical and Electrical Properties of TIO/ZnO Bi-layered Films

  • Choe, Su-Hyeon;Park, Yun-Je;Choi, Jin-Young;Kim, Daeil
    • 한국표면공학회지
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    • 제52권6호
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    • pp.289-292
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    • 2019
  • Transparent and conducting titanium doped indium oxide (TIO) thin films were deposited by RF magnetron sputtering on zinc oxide (ZnO)-coated glass substrates to investigate the effect of the ZnO buffer layer on optical and electrical properties of TIO/ZnO bi-layered films. TIO 90 nm / ZnO 10 nm films having a lower resistivity (3.09×10-3 Ωcm) and a higher visible transmittance (80.3%) than other TIO/ZnO films were prepared in this study. Figure of merit results indicate that a 10 nm thick ZnO thin film is an effective buffer layer that enhances optical transmittance and electrical conductivity of TIO films without intentional substrate heating or post-deposition annealing.

Polarization Distortion and Compensation of Circularly Polarized Emission from Chiral Metasurfaces

  • Yeonsoo Lim;In Cheol Seo;Young Chul Jun
    • Current Optics and Photonics
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    • 제7권2호
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    • pp.147-156
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    • 2023
  • Circularly polarized (CP) emission can be achieved by integrating emissive materials into chiral metasurfaces. Such CP light sources in integrated device platforms are desirable for important potential applications. However, the exact characterization of the polarization state in CP emission may include some errors because of the unwanted polarization distortion caused by optical components (e.g., beam splitter) in the optical setup. Here, we consider CP emission measurements from chiral metasurfaces and characterize the polarization distortion caused by the beam splitter. We first detail the procedures for the Stokes parameters and Mueller matrix measurements. Then, we directly measure the Mueller matrix of the beam splitter and retrieve the original polarization state of CP emission from our metasurface sample. Using the measured Mueller matrix of the beam splitter, we specifically identify what contributes to polarization distortion in CP emission. Our work may provide useful guidelines for the characterization and compensation of polarization distortion in general Stokes parameter measurements.