Kazuyuki Satoh

Properties of New Fluorinated Holographic Recording Material for Collinear Holography

A new fluorinated holographic recording material is applied with a view to realizing holographic information system (HIS) media that offer high multiplexing numbers and high recording sensitivity. We report here, for the first time, the successful recording and reconstruction of 750 multiplexed holograms on a 50 ×50 mm2 photopolymer coupon sample based on a novel fluorinated holographic recording material for collinear holography. The proposed material yields bit error rates (BERs) less than 10-2 in the X–Y plane of the coupon sample and thus is suitable for 532 nm optical data storage. Its fundamental properties, such as the relationship between BER and number of holograms, are determined. This new fluorinated material offers improved error maps as evidenced by the 0.4-mm-thick, 120-mm-diameter photopolymer disc. The average error rate is 1.61% for the disc sample. This new material successfully stored and reproduced a short segment of animated video data.

Flexible fluorine-based micro-lens arrays for photovoltaic modules

We present the first flexible micro-lens arrays designed for photovoltaic modules that utilize fluorine-based film. These micro-lens are fabricated as a key component of increasing electric generation in the fluorine-based film. The rigorous coupled wave analysis (RCWA) method was used for optical simulation. The simulation results showed that the transmittance of the optimized array structure at the 600 nm wavelength was 99.8% on average. Particularly, it is expected to increase scattering light as a high transmission of incident angle 5 degrees. The conventional c-Si photovoltaic modules tests of solar simulator have demonstrated that these fluorine-based film arrays perform 4.6 % for electric generation, depending on the incident angle. Further, a daily increase in electric generation of up to 6.7% was estimated on a cloudy spring day in Japan when this array was used. The efficiency of the micro-lens structure when compared with a previous model without arrays has been verified by outdoor electric generation tests.