Browsing by Author "Liu, Ren Chung"

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All-optically controlled light valve assembled by photorefractive crystal and PDLC hybrid structure
(2015-01-01)
Marinova, Vera
;
Liu, Ren Chung
;
Chen, Ming Syuan
;
Lin, Shiuan Huei
;
Lin, Yi Hsin
A light-valve device, assembled by Ru-doped Bi12SiO20 (BSO) photoconductive substrate and polymer dispersed liquid crystal layer is proposed, in which all the processes are controlled by the near infrared light. Laser beam illumination (Gaussian shape) on BSO:Ru crystal caused charge carriers generation, which migrate and form an inhomogeneous distribution and subsequent space charge field. This surface-localized electromagnetic field penetrates into the PDLC layer and modulate the orientation of the liquid crystals, that caused reverse of the device initial opaque state to the highly transparent one. The proposed structure is simple and easy to fabricate, without requirements of ITO contacts and alignment layers and opens further possibilities for near-infrared applications.
Near-Infrared Holography in Ruthenium Doped Bismuth Sillenite Crystal
(2010)
Marinova, Vera
;
Lin, Shiuan Huei
;
Liu, Ren Chung
;
Hsu, Ken Yuh
;
電子物理學系
Improvement of the response speed during real-time holographic recoding is demonstrated in Ru-doped bismuth sillenite crystal at 1064 nm after green light pre-exposure. By using gating light significant operation speed of 60 ms is achieved.
Near-infrared properties of Rh-doped Bi12TiO20 crystals for photonic applications
(2013-02-15)
Marinova, Vera
;
Liu, Ren Chung
;
Lin, Shiuan Huei
;
Chen, Ming-Syuan
;
Lin, Yi Hsin
The effect of Rh doping in Bi12TiO20 (BTO) crystals on the photosensitivity and recording speed at 1064 nm is reported. Response time of 0.1 s is measured during real-time holographic recording without any preliminary treatments. Once the crystal is pre-excited with a green light, the detected response time becomes 0.02 s. A possibility to implement BTO:Rh crystal plate with liquid crystals into a hybrid organic/inorganic device is demonstrated, which opens perspectives for further near-infrared applications. (c) 2013 Optical Society of America
Near-infrared sensitive photorefractive device using polymer dispersed liquid crystal and BSO: Ru hybrid structure
(2014-06-01)
Liu, Ren Chung
;
Marinova, Vera
;
Lin, Shiuan Huei
;
Chen, Ming-Syuan
;
Lin, Yi-Hsin
A near-infrared sensitive hybrid device, based on a Ru-doped BSO photorefractive substrate and polymer dispersed liquid crystal (PDLC) layer, is reported. It is found that the photoexcited charge carriers generated in the BSO: Ru substrate create an optically induced space charge field, sufficient to penetrate into the PDLC layer and to re-orient the LC molecules inside the droplets. Beam-coupling measurements at the Bragg regime are performed showing prospective amplification values and high spatial resolution. The proposed structure does not require indium tin oxide (ITO) contacts and alignment layers. Such a device allows all the processes to be controlled by light, thus opening further potential for real-time image processing at the near-infrared range. (C) 2014 Optical Society of America
Quasi-nonvolatile storage in Ru-doped Bi12SiO20 crystals by two-wavelength holography
(2012-08-27)
Marinova, Vera
;
Liu, Ren Chung
;
Lin, Shiuan Huei
;
Hsu, Ken Yuh
;
電子物理學系
Prolonged read-out process of a hologram recorded at near infrared with simultaneous green light exposure is measured in Ru-doped Bi12SiO20 crystal. The experimental results are confirmed by numerical simulations, suggesting two different traps involved in the space-charge transport mechanism. In addition, quasi-permanent holographic recording of image with fast updating speed by using two-wavelength recording is demonstrated. (C) 2012 Optical Society of America
Real-time holographic information processing at near infrared using ruthenium-doped bismuth sillenite crystals
(2011)
Lin, Shiuan Huei
;
Marinova, Vera
;
Liu, Ren Chung
;
Hsu, Ken Y.
;
電子物理學系
In this paper, we report our investigations on real-time holographic recoding at 1064 nm in Ru-doped bismuth sillenite crystal with a green gating light at 532 nm. By using gating light significant improvement of the response time to 80 ms is achieved and the prolonged read-out process of the recorded hologram is observed. We also demonstrate quasi-permanent holographic recording of image with fast speed in Ru-doped BSO crystal using two-wavelength recording.
Real-time holography in ruthenium-doped bismuth sillenite crystals at 1064 nm
(2011-06-01)
Marinova, Vera
;
Liu, Ren Chung
;
Lin, Shiuan Huei
;
Hsu, Ken Yuh
;
電子物理學系
Real-time holographic recording and an improvement of the response time in ruthenium (Ru)-doped Bi(12)SiO(20) (BSO) crystal at 1064nm is obtained. Using green light pre-exposure, a significant operation speed of 60ms is achieved. In addition, the ability for image reconstruction is demonstrated in Ru-doped BSO, supporting further applications as reversible media for real-time image processing at the near-IR spectral range. (C) 2011 Optical Society of America