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Terahertz biomedical imaging using a terahertz emitter based on InAs nanowires
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- Authors
- Dong Woo Park, Young Bin Ji, Ilgyu Choi, Jeongwoo Hwang, Jae Cheol Shin, Jin Chul Cho, Eui Su Lee, Seung Jae Oh, Siyun Noh, Jaehyeok Shin, Jin Soo Kim
- Issue Date
- 2025-03
- Citation
- Nanoscale, v.17, no.12, pp.7211-7217
- ISSN
- 2040-3364
- Publisher
- Royal Society of Chemistry
- Language
- English
- Type
- Journal Article
- Abstract
- We demonstrate the potential of using InAs nanowires (NWs) on Si(111) substrates for terahertz (THz) imaging in biomedical diagnostics. The cost-effectiveness and high precision of InAs NWs are discussed in comparison with those of InAs substrates. Using THz time-domain spectroscopy, the peak-to-peak current signals of catalyst-free InAs NWs and the substrate were measured at 3.37 nA and 1.61 nA, respectively. The THz amplitude of the InAs NWs increased by 47.7% compared to InAs wafers, with a fill factor of 0.034. At frequencies of up to 0.25 THz, the THz amplitude of InAs NWs was higher than that of bulk InAs. The resolution of THz images of a slice of pork belly and rat brain tumour tissue acquired using the InAs NWs was similar to that obtained with the InAs substrates. This suggests that InAs NW-based THz devices on Si substrates, which allow for large-area and cost-effective fabrication, could be useful for biomedical diagnostics.
- KSP Keywords
- 0.25 THz, Biomedical Imaging, Brain Tumour, Cost-effective fabrication, Cost-effectiveness, Current signals, Fill factor(F.F.), InAs NWs, InAs nanowires, Peak Current, Rat brain