• Title/Summary/Keyword: optical property

Search Result 1,066, Processing Time 0.041 seconds

Study on Optical Properties of Lithium niobate using Chemical Mechanical Polishing (화학 기계적 연마에 의한 리튬 니오베이트의 광학 특성에 관한 연구)

  • Jeong, Suk-Hoon;Kim, Young-Jin;Lee, Hyun-Seop;Jeong, Hae-Do
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.06a
    • /
    • pp.121-122
    • /
    • 2008
  • Lithium Niobate (LN:LiNbO3) is a compound of niobium, lithium and oxygen. The characteristics of LN are piezoelectricity, ferroelectricity and photoelectricity, and which is widely used in surface acoustic wave (SAW). To manufacture LN device, the LN surface should be a smooth surface and defect-free because of optical property, but the LN material is processed difficult by traditional processes such as grinding and mechanical polishing (MP) because of its brittleness. To decrease defects, chemical mechanical polishing (CMP) was applied to the LN wafer. In this study, the suitable parameters scuh as pressure and relative velocity, were investigated for the LN CMP process. To improve roughness, the LN CMP was performed using the parameters that were the highest removal rate among process parameters. And, evaluation of optical property was performed by the optical reflectance and non-linear characteristic.

  • PDF

Application of in-situ CaCO3 forming process on recycled fibers for optical property improvement (고지의 광학적특성 개선을 위한 in-situ 탄산칼슘처리기술의 적용)

  • Park, Dong-Hui;Lee, Min-Woo;Lee, Jong-Kyu;Ahn, Ji-Whan;Seo, Yung-Bum
    • Journal of Korea Technical Association of The Pulp and Paper Industry
    • /
    • v.44 no.4
    • /
    • pp.8-15
    • /
    • 2012
  • Optical property improvements for ONP (old newspaper) and OMG (old magazine) were attempted by application of in-situ $CaCO_3$ formation process on recycled fiber surfaces. Washing treatment of ONP and OMG resulted in 35~40% yield loss for around 6% brightness improvement. Washing plus bleaching process with $H_2O_2$ and FAS (formamidine sulfinic acid) improved brightness and ERIC values a little more with the same amount of yield loss as washing treatment. In-situ $CaCO_3$ formation method improved those optical properties much better than the washing plus bleaching method without loss of yield, and better than the case of adding high brightness PCC up to the same ash level. It can be said that the in-situ $CaCO_3$ formation method may be used as an effective alternative for upgrading optical properties of recycled fibers.

Penetration depth and Wave Propagation in Random Media (무질서한 매질에서 침투깊이와 파동 전파)

  • Kim, Ki-Jun;Sung, Ki-Chun
    • Journal of the Korean Applied Science and Technology
    • /
    • v.23 no.1
    • /
    • pp.70-76
    • /
    • 2006
  • The influence of fluorophor, scatterer, absorber in turbid materials by light scattering were interpreted for the scattered fluorescence intensity and wavelength, it is studied the molecular property by laser induced fluorescence spectroscopy. It can be found that the effects of optical property are penentrated in scattering media by the optical $parameters({\mu}s$, ${\mu}a$, ${\mu}t$, ${\gamma}$, ${\rho})$. The value of scattering coefficient ${\mu}s$ is large appeared by means of the increasing particles of scattering, it can be found that the slope appears exponentially as a function of distance from laser source to detector. It may also utilize in designing the best model for oil chemistry, laser medicine and application of medical engineering.

Effects of post-annealing treatment at various temperature on the light emission properties of ZnO thin films on sapphire (사파이어 기판 위에 증착된 ZnO 박막의 후열처리에 따른 발광특성 연구)

  • 강홍성;심은섭;강정석;김종훈;이상렬
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2001.07a
    • /
    • pp.119-122
    • /
    • 2001
  • ZnO thin films on (001) sapphire substrates have been deposited by pulsed laser deposition(PLD) technique at the oxygen pressure of 350 mTorr. In order to investigate the effect of post-annealing treatment with oxygenn pressure of 350 mTorr on the optical property of ZnO thin films, films have been annealed at various substrate temperatures after deposition. After post-annealing treatment in the oxygen ambient, the optical properties of the ZnO thin films were characterized by PL(Photoluminescence) and structural properties of the ZnO were characterized by XRD, and have investigated structural property and optical property for application of light emission device.

  • PDF

The influence of preparation condition on optical property of sol-gel derived hybrid organic-inorganic silica glass thin films (제작조건에 따른 졸-겔 복합 실리카 박막의 광학적 성질 변화)

  • 정재완
    • Korean Journal of Optics and Photonics
    • /
    • v.11 no.4
    • /
    • pp.255-260
    • /
    • 2000
  • We report that the crack-free organic-inorganic hybrid silica thin films were fabricated by sol-gel process using organometallic compounds as a precursor and that we have established very reproducible fabrication condition with systematic investigation of thickness and refractive index variations for various control parameters, such as, coating type, coating speed, chemical composition, prebake and postbake temperature. Additionally, we measured and compared the change of optical property with the UV exposure dose for three different kinds of photoinitiators. Furthermore, the fabrication of Ix4 MMI optical power splitter using the sol-gel thin film provides the possibility of various applications to the optical waveguide devices. vices.

  • PDF

Electrical and Optical Properties of ITO Thin films Prepared on the PET Substrate (PET 기판 위에 증착된 ITO 투명전도막의 전기적ㆍ광학적 특성)

  • Song, Woo-Chang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.17 no.12
    • /
    • pp.1277-1282
    • /
    • 2004
  • ITO films on PET substrate were prepared by DC magnetron sputtering method using powdery target with different deposition conditions. In addition, the electrical and optical properties were investigated. As the sputtering power and working pressure were higher, the resistvity of ITO films increased. The optical transmittance deteriorated with increasing sputtering power and thickness. As the working pressure increased, however, the optical transmittance improved at visible region of light. From these results, we could deposited ITO films with 8${\times}$10$^{-3}$ $\Omega$-cm of resistivity and 80 % of transmittance at optimal conditions.

Optical nonlinearity in genetic material (유전물질의 비선형 광학 특성)

  • Park, Byeongho;Jun, Seong Chan
    • Transactions of the Society of Information Storage Systems
    • /
    • v.10 no.1
    • /
    • pp.19-22
    • /
    • 2014
  • Optical nonlinear property is utilized to the wave generation, generating the beam at intended wavelength, and optical computing systems. The genetic material, which is the DNA with helical structure in nano-scale, is fascinating for optics communities due to artificially controllable sequence that determines the physical and chemical property. Nonlinearity of DNA was investigated by the four wave mixing experiment, which is with two incident beams located at 1550nm and 1650nm. The four output beams including incident beams are emitted from genetic material such as 1461nm and 1763nm by nonlinear characteristic. The 1461nm beam which is generated by four wave mixing phenomena was observed by optical spectrum analyzer.

Optical Arithmetic Technique Using Optical Phase Conjugate Wave (위상 공액파를 이용한 광학적 연산 방식)

  • 엄순영
    • Proceedings of the Optical Society of Korea Conference
    • /
    • 1990.02a
    • /
    • pp.95-101
    • /
    • 1990
  • Parallel optical arithmetic techniques have been developed using the correlation property of optical phase conjugate wave generated by degenerated four wave-mixing. In this paper, conventional rectangular-type coded pattern used for optical logic system is replaced by circular one for effective beam coupling in a photorefractive $BaTiO_3$ material. By adequately adjusting the distance between circular-type pixels of the input pattern and grouping the correlated output, optical binary half addition/subtraction, binary multiplication and, matrix-matrix computation are demonstrated.

  • PDF