Organic-inorganic composites for THz device fabrication

B. Cai; T. M. Ye; G. Bo; X. C. Wang; Y. Z. Li; Y. M. Zhu; O. Sugihara

doi:10.1117/12.2218782

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24 February 2016 Organic-inorganic composites for THz device fabrication

B. Cai, T. M. Ye, G. Bo, X. C. Wang, Y. Z. Li, Y. M. Zhu, O. Sugihara

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Proceedings Volume 9745, Organic Photonic Materials and Devices XVIII; 974517 (2016) https://doi.org/10.1117/12.2218782
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

In this paper, several organic-inorganic composites were prepared for Terahertz (THz) devices fabrication. First, a two-layer structure was designed for femtosecond (fs) laser/THz radiation separation. The top layer was made by sintered 20-40 nm hollow quartz particles which can diffuse the incident fs laser thus decrease the power intensity. The bottom layer comprised of silicon 100 nm particles and cycle-olefine polymer (COP), by which the fs laser light can be greatly scattered and absorbed but THz radiation can propagate insusceptibly. With this two-layer structure a high efficient fs-laser/THz filter was fabricated successfully. Second, titania–polymer composites with a very high refractiveindex tunability and high transparency in the THz region were prepared. By controlling the blending ratio of the titania particle, a broad refractive-index tuning range from 1.5 to 3.1 was realized. Then, the composites were used to fabricate antireflective (AR) layers on a high-resistivity silicon (HR-Si) substrate. By utilizing the thermoplasticity of the titania– polymer composite, a graded-index structure was fabricated via a hot-embossing method. Because of the good refractive-index matching between the composite and the HR-Si substrate, a broadband AR layer was fabricated.

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B. Cai, T. M. Ye, G. Bo, X. C. Wang, Y. Z. Li, Y. M. Zhu, and O. Sugihara "Organic-inorganic composites for THz device fabrication", Proc. SPIE 9745, Organic Photonic Materials and Devices XVIII, 974517 (24 February 2016); https://doi.org/10.1117/12.2218782

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