Quasi-optic millimeter-wave device application of liquid crystal material by using porous PMMA matrix

T. Nose; Y. Watanabe; A. Kon; R. Ito; M. Honma

doi:10.1117/12.2295062

8 February 2018 Quasi-optic millimeter-wave device application of liquid crystal material by using porous PMMA matrix

T. Nose, Y. Watanabe, A. Kon, R. Ito, M. Honma

Proceedings Volume 10555, Emerging Liquid Crystal Technologies XIII; 105550T (2018) https://doi.org/10.1117/12.2295062
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Recently, millimeter-waves (MMWs) have become indispensable for application in next-generation high-speed wireless communication i.e., 5G, in addition to conventional applications such as in automobile collision avoidance radars and airport security inspection systems. Some manageable devices to control MMW propagation will be necessary with the development of this new technology field. We believe that liquid crystal (LC) devices are one of the major candidates for such applications because it is known that LC materials are excellent electro-optic materials. However, as the wavelength of MMWs is extremely longer than the optics region, extremely thick LC layers are necessary if we choose the quasioptic approach to attain LC MMW control devices. Therefore, we adopt a PDLC structure to attain the extremely thick LC layers by using porous (polymethyl methacrylate) PMMA materials, which can be easily obtained using a solvent consisting of a mixture of ethanol/water and a little heating. In this work, we focus on Fresnel lens, which is an important quasi-optic device for MMW application, to introduce a tunable property by using LC materials. Here, we adopt the thin film deposition method to obtain a porous PMMA matrix with the aim of obtaining final composite structure based on the Fresnel substrate. First, the fundamental material properties of porous PMMA are investigated to control the microscopic porous structure. Then, the LC-MMW Fresnel lens substrate is prepared using a 3D printer, and the fundamental MMW focusing properties of the prototype composite Fresnel structure are investigated.

Citation Download Citation

T. Nose, Y. Watanabe, A. Kon, R. Ito, and M. Honma "Quasi-optic millimeter-wave device application of liquid crystal material by using porous PMMA matrix", Proc. SPIE 10555, Emerging Liquid Crystal Technologies XIII, 105550T (8 February 2018); https://doi.org/10.1117/12.2295062

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KEYWORDS

Polymethylmethacrylate

Extremely high frequency

Liquid crystals

Refractive index

Fresnel lenses

3D printing

Composites

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