| Project/Area Number |
25390092
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Chiba University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
OMATSU Takashige 千葉大学, 大学院融合科学研究科, 教授 (30241938)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | テラヘルツ / 光渦 / THz / 軌道角運動量 / 顕微鏡 / 非線形光学 / 量子エレクトロニクス / optical vortex |
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| Outline of Final Research Achievements |
An optical vortex can exhibit an annular intnsity profile characterized by a topological charge of l that originates from a phase singularity. This phenomenon enables us to enrich many research areas, such as super-resolution microscopy, and chiral fabrications. Most of the optical vortices studies have concerned the frequency range from the visible to middle infrared region. We here focus on the terahertz (THz) region, which includes various fingerprint spectra of molecules and clusters.
A THz spiral phase plate (SPP) having high transmission and extremely low frequency dispersion, based on the Tsurupica polymer, has been developed, thereby efficiently generating THz optical vortices. We have successfully demonstrated THz vortex output by using a Tsurupica SPP and tunable THz source. The magnitude and sign of the topological charge of THz vortex output were also observed by utilizing the tilted lend focusing and radial defect introduction techniques.
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