| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
This study aims at developing a method for generating subdiffraction limit optical patterns, which contain an optical pattern finer than the diffraction limit spot, using propagating light. We designed a diffractive optical element that generated an array of subdiffraction limit spots using our own algorithm. Experimental results showed that various arrangements of subdiffraction limit optical spots were achievable. The spot size was 70% of the diffraction limit spot in design and no more than 80% in experiment. Furthermore, wavelength multiplexing subdiffraction limit optical spots can be generated in three dimensions. We applied the method to visual cryptography which was based on physical limit, and demonstrated that a secret image was visually recognized only by using a designated subdiffraction limit optical pattern as a key.
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