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6 Result(s)

within Daisuke Sakai Remove this filter Optics, Lasers, Photonics, Optical Devices Remove this filter

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  1. No Access

    Article

    High-chroma visual cryptography using interference color of high-order retarder films

    Visual cryptography can be used as a method of sharing a secret image through several encrypted images. Conventional visual cryptography can display only monochrome images. We have developed a high-chroma colo...

    Shiori Sugawara, Kenji Harada, Daisuke Sakai in Optical Review (2015)

  2. No Access

    Article

    New method of increasing diffraction efficiency of grating transferred in glass substrate by corona-charging treatment

    We propose a new method of increasing the diffraction efficiency of a glass substrate onto which a grating structure has been transferred by corona-charging treatment. The first-order diffraction efficiency wa...

    Daisuke Sakai, Takashi Fukuda, Kenji Harada in Optical Review (2013)

  3. No Access

    Article

    Replicative fabrication of diffractive structure from self-assembled particles onto a glass substrate using corona-charging treatment

    We have succeeded in the first fabrication of a diffractive structure replicated onto a glass substrate using a template of self-assembled polystyrene particles via corona-charging treatment. A hexagonal close...

    Daisuke Sakai, Daichi Miho, Kenji Harada, Daisuke Barada, Takashi Fukuda in Optical Review (2010)

  4. No Access

    Article

    Hologram recording in glass and direct reconstruction using visible-wavelength laser beam

    We propose a method of hologram recording in a glass plate by corona charging. The holographic recording materials used in this study are conventional soda-lime glass and azobenzene polymer film. A Fourier tra...

    Daisuke Sakai, Kenji Harada, Shun-ichi Kamemaru, Daisuke Barada… in Optical Review (2009)

  5. No Access

    Article

    Hologram Recording in Various Glass Plates by Corona Charging

    We propose techniques of hologram replication in glass plates and reconstruction on another film by corona charging. A surface relief hologram on an azobenzene polymer film was recorded in the form of electric...

    Daisuke Sakai, Kenji Harada, Shun-ichi Kamemaru, Takashi Fukuda in Optical Review (2007)

  6. No Access

    Article

    Direct Fabrication of Surface Relief Holographic Diffusers in Azobenzene Polymer Films

    We propose a direct fabrication of light diffusers using azobenzene polymer films. Holographic recordings of surface relief diffusers are formed on the polymer film by exposure to an Nd:YAG laser (532 nm) thro...

    Daisuke Sakai, Kenji Harada, Shun-ichi Kamemaru, Mohamed A. El-Morsy… in Optical Review (2005)