Integrated Terahertz Optics with Effective Medium for 600-GHz-band Imaging
| Autor: | Tomoki Sagisaka, Tadao Nagatsuma, Ryohei Kaname, Li Yi, Masayuki Fujita, Masato Kikuchi, Daniel Headland, Naoya Kukutsu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Silicon business.industry Intrinsic semiconductor Terahertz radiation Bandwidth (signal processing) ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION chemistry.chemical_element Noise (electronics) law.invention Optics chemistry law Reflection (physics) Wafer business Beam splitter |
| Zdroj: | Scopus-Elsevier |
| Popis: | Terahertz waves hold potential in industrial imaging applications, to detect sub-millimeter defects and undesired foreign materials. However, terahertz imaging systems are generally bulky due to the need for optical components, and this is a key issue that has limited the scope of practical applications. In this work, we address this limitation by integrating terahertz optics in micro-structured intrinsic silicon. Four half-Maxwell fisheye lenses and a beam splitter are directly integrated together, and fabricated from a single silicon wafer, to realize a terahertz imaging system for the 600-GHz band. The device is evaluated with both full-wave simulation and experimental techniques. It is found to exhibit ultra-wide bandwidth as a spatial mixer, which is beneficial for low-coherence imaging using a terahertz noise source. The proposed method demonstrates a promising new approach for imaging and sensing applications using compact terahertz devices. |
| Databáze: | OpenAIRE |
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