1999 Fiscal Year Final Research Report Summary
Evaluation and application of liquid crystal materials in the millimeter and submillimeter wave region
| Project/Area Number |
09650006
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Akita Prefectural University (1999)
Akita University (1997-1998) |
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Principal Investigator |
NOSE Toshiaki Akita Pref. Univ., System science and technology, Prof., システム科学技術学部, 教授 (00180745)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Liquid crystal / Millimeter wave / Submillimeter wave / Phase modulation / Beam steering / LC / polymer composite materials |
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| Research Abstract |
There are two main objects in this project. First one is evaluation of the unknown refractive index of the liquid crystal (LC) materials in millimeter and submillimeter electromagnetic wave region which is still frontier of the frequency resources. Next one is investigation of a possibility application of the liquid crystal materials to amplitude and/or phase controlling device in the very high frequency regions. An extraordinary LC cell using the rectangular wave guide was fabricated and the transmission properties of the millimeter wave were investigated using network analyzer. Large change of the amplitude and phase can be obtained by applying magnetic field to the wave guide LC cell.
Complex refractive index was estimated by using submillimeter waver laser and interferometry technique for the first time. The new optical-test investigation led to cause a new application of liquid crystal materials to the optical measuring system.
High transmission electrode and cell structures are indispensable for actual device application, because the conventional LC driving electrode causes a very large loss in the high frequency waves. Grating electrode structure and sandwich cell structure were proposed and they were very effective for high transmission with large variability and high response speed. Phase control, amplitude control and beam steering functions were investigated in the millimeter wave region by using the device structure. In the submillimeter region, there are some further difficulties to achieve the same controlling devices because of the substrate materials and the device size. A new LC device fabrication method by using LC/polymer composite have been investigated to overcome the problems.
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