• 제목/요약/키워드: Holographic grating

검색결과 119건 처리시간 0.03초

Holographic Grating Erasing Characteristics by Non-polarized Beam in Amorphous Chalcogenide Thin Films

  • Lee, Ki-Nam;Park, Jeong-Il;Chung, Hong-Bay
    • Transactions on Electrical and Electronic Materials
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    • 제7권3호
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    • pp.141-144
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    • 2006
  • In the present work, we investigated the holographic grating erasing method by means of the optical method. It was formed the grating under the interference of holographic recording He-Ne laser beams on chalcogenide $As_{40}Ge_{10}Se_{15}S_{35}$ thin film with various film thickness and erased the holographic grating by non-polarized He-Ne laser beam. As the results, the recording grating erased the 80 % of formed grating by non-polarized He-Ne laser beam. It was confirmed that the erasing characteristics by non-polarized laser beam need to improve the focusing of beam and the control of beam intensity. And then it can be expected as the application possibility of rewritable holographic memory technology.

2-Dimensional Holographic Grating Formation in Chalcogenide Thin Films

  • Lee, Jung-Tae;Yeo, Choel-Ho;Chung, Hong-Bay
    • Transactions on Electrical and Electronic Materials
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    • 제5권1호
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    • pp.34-37
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    • 2004
  • Amorphous chalcogenide thin films, especially a-(Se, S) based films, exhibit a number of photo-induced phenomena. In this study, we make the As$\_$40/Ge$\_$10/Se$\_$15/S$\_$35//Ag thin film and then we measure the holographic diffraction efficiency according to thickness of Ag. And we form the two-dimensional holographic grating. At first, we formed one-dimensional grating and then we form two-dimensional grating by rotate the sample. We found out the most suitable thickness of Ag and in case of As$\_$40/Ge$\_$10/Se$\_$15/S$\_$35//Ag(600${\AA}$), the diffraction efficiency was more higher than other samples. The holographic grating was formed by He-Ne laser(λ=632.8nm). The intensity of incident beam was 2.5mW and incident angle was 20$^{\circ}$. We confirm. the two-dimensional holographic grating by the pattern of diffracted beam and AFM(Atomic Force Microscope) image. We perform the etching process using by 0.26N NaOH in order to confirm clearly two-dimensional grating.

Photoresist을 이용한 Thin relief 위상형 홀로그램 격자에 관한 연구. (A Study on thin relief phase holographic grating using photoresist.)

  • 신광용;최도형;김남;박한규
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(I)
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    • pp.47-50
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    • 1987
  • There are various holographic recording materials, such as Dichromated Gelatin, Silver Halide, Thermoplastic, Photoresist. In this paper especially, we used Photoresist to make the phase holographic grating. Deep-groove diffractive grating formed in relatively thin holographic recording material is to express high diffraction efficiency. Phase holographic grating recorded In photoresist can be used very practical because it has the high diffraction efficiency, and it is possible to make a replication easily. So, it has the merit in recording the optical holographic grating than any other materials.

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AsGeSeS(10,20,40,80nm) 박막에서의 홀로그래픽 격자 형성 (Holographic grating formation in AsGeSeS(10,20,40,80nm) thin films)

  • 이기남;여철호;김종빈;이영종;정홍배
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 춘계학술대회 논문집 디스플레이 광소자분야
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    • pp.119-122
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    • 2004
  • This paper discovers that we form holographic grating in AsGeSeS thin film. Holographic grating is not developed in the length of 10,20,40nm, while it is formed in the thin film of 80nm though it shows very low diffraction efficiency. On the contrary, holographic grating is established in every thin film of Ag(10nm)/AsGeSeS(10,20,40,80nm). Lattice in 10,20 nm thin film builds up, and immediately disappears. In the case of 40nm thin film, even if holographic grating is made up, it seems to have a low diffraction efficiency. Apart from 10,20,40nm, it shows the highest diffraction efficiency in the thin film of 80nm.

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홀로그래픽 격자 형성에 대한 칼코게나이드 박막의 열처리 효과 (Annealing Effect of the Chalcogenide Thin Film for Holographic Grating Formation)

  • 박정일;신경;이정태;이영종;정홍배
    • 한국전기전자재료학회논문지
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    • 제16권8호
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    • pp.736-739
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    • 2003
  • We prepared the chalcogenide As$\_$40/Ge$\_$10/Se$\_$15/S$\_$35/, Se$\_$75/Ge$\_$25/ thin film. Holographic grating was formed by the He-Ne laser( λ =633 nm). Annealing at 100$^{\circ}C$ and 200$^{\circ}C$ has been used to change the optical property of chalcogenide thin films for holographic grating formation. As the results, large variation of the optical property was generated at the As$\_$40/Ge$\_$10/Se$\_$15/S$\_$35/ chalcogenide film. Diffraction efficiency of the As$\_$40/Ge$\_$10/Se$\_$15/S$\_$35/ film has been enhanced about three times

칼코게나이드 As-Ge-Se-S 박막에서 홀로그래픽 격자의 에칭 특성 (Etching characteristics of holographic grating on chalcogenide As-Ge-Se-S thin films)

  • 박종화;박정일;나선웅;손철호;신경;이영종;정홍배
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 하계학술대회 논문집
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    • pp.644-647
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    • 2001
  • Amorphous As-Ge-Se-S thin films have been studied with the aim of identifying optimum etching condition which can be used to produce holographic grating structure for use as diffractive optical elements. In this study, holographic gratings have been formed using He-Ne laser(632.8nm), and fabricated by the method of wet etching using NaOH etchant with various concentration(0.26N, 0.33N, 0.40N). The diffraction efficiency was obtained by +1st order intensity of the diffracted beam. The formed grating profiles were observed by atomic force microscope and showed that the expected grating profile could be achieved by controlling the etching time. Over-etching resulted in under-cutting of the grating lines. The highest 1st order diffraction efficiency for these gratings was about 5.05%.

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비정질 칼코게나이드 박막에서의 2차원 홀로그래픽 격자 형성 (2-Dimensional Holographic grating formation in amorphous chalcogenide thin film)

  • 이정태;문장원;여철호;신경;구대성;김종빈;정홍배
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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    • pp.976-979
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    • 2003
  • In this study, we formed the 2-dimensional holographic grating in order to mamufactured 2-dimensional photonic crystal in amorphous $As_{40}Ge_{10}Se_{15}S_{35}$ and $Ag/As_{40}Ge_{10}Se_{15}S_{35}$ thin film which have the excellent optical sensetivity using by He-Ne laser(632.8nm). The intensity of incident beam was 2.5mW and incident angle that $2{\theta}$ is $20^{\circ}$. We formed the holographic grating after had formed the 1-dimansional holographic grating and then rotate the sample. We confirmed that 2-dimensional holographic grating result of the figure of diffracted beam and AFM(Atomic Forced Microcopy) image.

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Cascaded Volume Holographic Gratings for expanding the Channel Number of a Optical Demultiplexer

  • Lee, Kwon-Yeon;Jeung, Sang-Huek;Do, Duc-Dung;An, Jun-Won;Kim, Nam
    • 융합신호처리학회논문지
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    • 제8권2호
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    • pp.84-90
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    • 2007
  • 캐스케이드 홀로그래픽 부피격자를 이용한 130채널 광 역다중화기를 제안하고 실험적으로 입증하였다. 첫 번째 격자와는 서로 다른 격자주기, 경사각, 중심파장 등은 갖는 두 번째 홀로그래픽 격자를 첫 번째 격자에 직렬로 부가함으로써 역 다중화기의 동작파장범위를 늘릴 수 있으며, 결국 홀로그래픽 역다중화기의 채널수는 두 배 증가하게 된다. 본 논문에서는 채널 균일도가 3.5dB, 3dB 대역폭이 0.12nm, 채널누화가 -20dB인 0.4nm 채널간격을 갖는 역다중화기를 실험적으로 구현하였다.

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Photopolymer-based Surface-normal Input/Output Volume Holographic Grating Coupler for 1550-nm Optical Wavelength

  • Lee, Kwon-Yeon;Jeung, Sang-Huek;Cho, Byung-Mo;Kim, Nam
    • Journal of the Optical Society of Korea
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    • 제16권1호
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    • pp.17-21
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    • 2012
  • A surface-normal input/output volume holographic grating coupler (VHGC) operating at 1550nm wavelength region by using a $10{\mu}m$-thick DuPont photopolymer film is designed and fabricated. The angular and wavelength responses of the input/output VHGC are investigated in order to validate applicability of this device in integrated optics and optical communications. The effect of incident-beam position on the output reflectance to determine optimum condition for input coupling is also presented. The fabricated input/output VHGC exhibited an angular selectivity of ${\sim}0.027^{\circ}$, a wavelength selectivity of ~0.8 nm, and an output peak reflectance of 34.13%.

Ag/As-Ge-Se-S 다층박막에서 편광상태에 따른 홀로그래피 격장 형성 특성 (Characteristics of the Polarization-Dependent Holographic grating formation on Ag/As-Ge-Se-S Multi-Layer)

  • 나선웅;이정태;여철호;이영종;정홍배
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2002년도 춘계학술대회 논문집 디스플레이 광소자 분야
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    • pp.85-88
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    • 2002
  • We have carried out two-beam interference experiments to form holographic gratings on chalcogenide $Ag/As_{40}Se_{15}S_{35}Ge_{10}$ multi-layer. In this study, holographic gratings have been formed using He-Ne laser(632.8nm) under different polarization combinations(intensity polarization holography, phase polarization holography). The diffraction efficiency was obtained by +1st order intensity and formed grating structure was investigated using atomic force microscopy.

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