| Budget Amount *help |
¥24,960,000 (Direct Cost: ¥19,200,000、Indirect Cost: ¥5,760,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2016: ¥20,540,000 (Direct Cost: ¥15,800,000、Indirect Cost: ¥4,740,000)
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| Outline of Final Research Achievements |
We built an experimental apparatus that can trap nanoparticles in vacuum in an optical lattice formed with an infrared laser and observe their three dimensional motion precisely. With this apparatus, we found that nanoparticles in vacuum tend to have a relatively large charge of about 50 to 200 elementary charges and can be readily manipulated by oscillating electric fields. Furthermore, we demonstrated an efficient cooling method relying on the optical observation of single charged nanoparticles and the application of feedback electric fields that decelerate the amplitude of the nanoparticles’ motion and reached ultralow temperatures in three dimensions. Simultaneously, we established a procedure to properly measure the mass and the charge number of trapped nanoparticles.
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