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Improvement of Terahertz Wave Radiation for InAs Nanowires by Simple Dipping into Tap Water

 Dong Woo Park  ;  Young Bin Ji  ;  Jehwan Hwang  ;  Cheul-Ro Lee  ;  Sang Jun Lee  ;  Jun Oh Kim  ;  Sam Kyu Noh  ;  Seung Jae Oh  ;  Sang-Hoon Kim  ;  Tae-In Jeon  ;  Kwang-Un Jeong  ;  Jin Soo Kim 
 SCIENTIFIC REPORTS, Vol.6 : 36094, 2016 
Journal Title
Issue Date
Nanowires* ; Terahertz Radiation* ; Terahertz Spectroscopy/instrumentation ; Terahertz Spectroscopy/methods* ; Water*
We report improvement of terahertz (THz) wave radiation for Si-based catalyst-free InAs nanowires (NWs) by simple dipping into tap water (DTW). In addition, the possibility of using InAs NWs as a cost-effective method for biomedical applications is discussed by comparison to bulk InAs. The peak-to-peak current signals (PPCSs) of InAs NWs measured from THz time-domain spectroscopy increased with increasing NW height. For example, the PPCS of 10?μm-long InAs NWs was 2.86 times stronger than that of 2.1?μm-long NWs. The THz spectra of the InAs NWs obtained by applying a fast Fourier transformation to the current signals showed a main frequency of 0.5?THz, which can be applied to a variety of medical imaging systems. After the DTW process, structural variation was not observed for 2.1?μm-long InAs NWs. However, the top region of several InAs NWs with heights of 4.6 and 5.8?μm merged into a conical structure. InAs NWs with a height of 10?μm resulted in a bundle feature forming above the conical shape, where the length of bundle region was 4?μm. After the DTW process, the PPCS for 10?μm-long InAs NWs increased by 15 percent compared to that of the as-grown case.
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5. Research Institutes (연구소) > Institute for Medical Convergence (연의-생공연 메디컬융합연구소) > 1. Journal Papers
Yonsei Authors
Oh, Seung Jae(오승재)
Ji, Young Bin(지영빈)
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