Abstract
We have utilized highly efficient optical modulation of terahertz (THz) transmission in organic/inorganic semiconductor hybrid system for active control of THz metamaterials. We have investigated highly efficient optical modulation of THz transmission through Si substrate coated with thin layer of organic π-conjugated material, copper phthalocyanine (CuPc) under various continuous-wave (CW) laser light irradiation conditions using THz time-domain spectroscopy. It has been believed that the charge carrier transfer from inorganic semiconductor substrate to π-conjugated material is crucial for efficient optical modulation of THz transmission. We found that the thickness of CuPc layer is a critical parameter to realize high charge carrier density for efficient optical modulation of THz transmission. We also investigated several solution-processable π-conjugated materials instead of CuPc and found that some of them show better modulation efficiency than CuPc. We fabricated a silver split-ring resonator (SRR) array metamaterial on CuPc-coated Si utilizing superfine ink-jet printer and succeeded in obtaining efficient modulation of THz resonant responses of SRR array metamaterials by CW laser light irradiation. Our findings may be utilized to fabricate various types of THz active metamaterials utilizing printing technologies.
Masanori Hangyo Deceased on Oct. 25, 2014.
This chapter is based on the following articles: T. Matsui et al., Opt. Lett. 38, 4632 (2013). Copyright 2013 ©The Optical Society and T. Matsui et al., Jpn. J. Appl. Phys. 55, 03DC12 (2016). Copyright 2016 ©The Japan Society of Applied Physics.
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Acknowledgements
This work has been supported in part by a Grant-in-Aid for Scientific Research on Innovative Areas (No. 22109001 and No. 25109709) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan and in part by a Grant-in-Aid for Scientific Research, KAKENHI, for Scientific Research (B) (No. 25286063) from the Japan Society for the Promotion of Science (JSPS), Japan, and by the joint research project of the Institute of Laser Engineering, Osaka University (No. 2015B1-17). The authors acknowledge graduate students worked on the project: Ryosuke Takagi, Yuto Inose, Shota Kuromiya, and Hiroki Mori.
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Matsui, T., Takano, K., Nakajima, M., Hangyo, M. (2019). Efficient Optical Modulation of Terahertz Metamaterials Utilizing Organic/Inorganic Semiconductor Hybrid Systems. In: Sakoda, K. (eds) Electromagnetic Metamaterials. Springer Series in Materials Science, vol 287. Springer, Singapore. https://doi.org/10.1007/978-981-13-8649-7_8
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