期刊
OPTICS EXPRESS
卷 27, 期 20, 页码 28707-28721出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.27.028707
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资金
- Core Research for Evolutional Science and Technology (CREST) program of Japan Science and Technology Agency [JPMJCR1534]
- Ministry of Education, Culture, Sports, Science and Technology of Japan [17H01764]
- Grants-in-Aid for Scientific Research [17H01764] Funding Source: KAKEN
Metallic deep-subwavelength features can aid in integration of microscopic components or strong light-matter interaction with a low-loss dielectric waveguide platform. A mode converter or coupler is required to integrate the devices. However, there is a vast difference in the physical scale and modal distribution between the deep-subwavelength structures and the dielectric waveguide platform. Here, we employ a tapered-slot mode converter to facilitate the electromagnetic wave transition from a gap width smaller than 1/100 of a wavelength (lambda) to a larger-scale mode that is amenable to a terahertz (THz) silicon photonic-crystal waveguide. The mode converter is metallic, and fabricated on top of indium phosphide substrate, leading to incongruity with the modal field distribution of the silicon photonic-crystal waveguide. To mitigate this, a sandwiched structure is developed to match the symmetry of the mode of photonic-crystal waveguide, thereby facilitating efficient transfer of energy. For a proof of concept, we integrate a resonant tunneling diode (< 2 mu m) as a THz detector in a photonic-crystal waveguide platform in the 0.3-THz band (lambda similar to 1 mm). The coupling efficiency is close to unity (similar to 90%) with broadband operation (similar to 50 GHz) in experiments. Thereafter, we employ the developed integrated device as a receiver in a THz communication experiment. In this manner, we successfully achieve real-time error-free data transmission at 32 Gbit/s, and demonstrate wireless transmission of uncompressed 4K high-definition video. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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