• 제목/요약/키워드: optical property

검색결과 1,064건 처리시간 0.029초

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

  • 정석훈;김영진;이현섭;정해도
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
    • /
    • 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

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

  • 박동휘;이민우;이종규;안지환;서영범
    • 펄프종이기술
    • /
    • 제44권4호
    • /
    • 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.

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

  • 김기준;성기천
    • 한국응용과학기술학회지
    • /
    • 제23권1호
    • /
    • 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.

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

  • 강홍성;심은섭;강정석;김종훈;이상렬
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2001년도 하계학술대회 논문집
    • /
    • 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

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

  • 정재완
    • 한국광학회지
    • /
    • 제11권4호
    • /
    • pp.255-260
    • /
    • 2000
  • 유기 금속화합물을 출발물질로 이용하는 졸-겔 방법으로 균열이 없는 유기-무기 복합 실리카 박막을 제작하였으며, 코팅방법, 조성비, prebake, postbake 온도 등의 제작조건에 따른 박막의 두께 및 굴절률의 변화를 체계적으로 조사하여 재현성 있는 제작조건을 확립하였다. 특히 광개시제를 첨가하였을 때 자외선 노광량에 따른 광학적 성질변화를 세 가지 광개시제에 대하여 측정, 비교하였다. 또한 졸-겔 박막으로 다중모드 간섭을 이용한 광 파워 분배기를 제작하여 광소자로의 응용 가능성을 살펴보았다.

  • PDF

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

  • 송우창
    • 한국전기전자재료학회논문지
    • /
    • 제17권12호
    • /
    • 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.

유전물질의 비선형 광학 특성 (Optical nonlinearity in genetic material)

  • 박병호;전성찬
    • 정보저장시스템학회논문집
    • /
    • 제10권1호
    • /
    • 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.

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

  • 엄순영
    • 한국광학회:학술대회논문집
    • /
    • 한국광학회 1990년도 제5회 파동 및 레이저 학술발표회 5th Conference on Waves and lasers 논문집 - 한국광학회
    • /
    • 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