Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy
Summary: Ultrafast laser interactions with topological insulators (TIs) have garnered tremendous interest for understanding light-matter interactions and developing optoelectronic devices across visible to terahertz (THz) regions owning to their high carrier mobility and sensitivity to electric fiel...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | iScience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2589004225001002 |
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| author | Ziyu Huang Jing Li Peiyan Li Lin Du Mingcong Dai Jiahua Cai Zejun Ren Tianxiao Nie Xiaojun Wu |
| author_facet | Ziyu Huang Jing Li Peiyan Li Lin Du Mingcong Dai Jiahua Cai Zejun Ren Tianxiao Nie Xiaojun Wu |
| author_sort | Ziyu Huang |
| collection | DOAJ |
| description | Summary: Ultrafast laser interactions with topological insulators (TIs) have garnered tremendous interest for understanding light-matter interactions and developing optoelectronic devices across visible to terahertz (THz) regions owning to their high carrier mobility and sensitivity to electric fields. In particular, within the THz regime, TIs hold considerable promise to realize advanced emitters, modulators, and detectors because of their fascinating ultrafast THz dynamics. However, a detailed understanding of TIs’ THz dynamics necessitates access to both nanoscale and femtosecond timescale. By utilizing THz scattering-type scanning near-field optical microscopy, we investigated THz time-domain spectroscopy, optical-pump THz probe, and THz emission in TI thin films at nanoscale. We analyzed their static scattering characteristics, morphology, and observed THz emission and photocarrier dynamics lasting approximately 10 ps, with dependencies of thickness and power. Our findings reveal the nanoscale ultrafast dynamics of TIs and demonstrate THz s-SNOM’s potential to enhance compact THz device development. |
| format | Article |
| id | doaj-art-96d89af4c5ae43b293d58a9f3c788787 |
| institution | Kabale University |
| issn | 2589-0042 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | iScience |
| spelling | doaj-art-96d89af4c5ae43b293d58a9f3c7887872025-02-02T05:29:10ZengElsevieriScience2589-00422025-02-01282111840Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopyZiyu Huang0Jing Li1Peiyan Li2Lin Du3Mingcong Dai4Jiahua Cai5Zejun Ren6Tianxiao Nie7Xiaojun Wu8Hangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaFert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, ChinaHangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaHangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaHangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaHangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaHangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaFert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China; Corresponding authorHangzhou International Innovation Institute, Beihang University, Hangzhou 311115, China; School of Electronic and Information Engineering, Beihang University, Beijing 100191, China; Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China; Corresponding authorSummary: Ultrafast laser interactions with topological insulators (TIs) have garnered tremendous interest for understanding light-matter interactions and developing optoelectronic devices across visible to terahertz (THz) regions owning to their high carrier mobility and sensitivity to electric fields. In particular, within the THz regime, TIs hold considerable promise to realize advanced emitters, modulators, and detectors because of their fascinating ultrafast THz dynamics. However, a detailed understanding of TIs’ THz dynamics necessitates access to both nanoscale and femtosecond timescale. By utilizing THz scattering-type scanning near-field optical microscopy, we investigated THz time-domain spectroscopy, optical-pump THz probe, and THz emission in TI thin films at nanoscale. We analyzed their static scattering characteristics, morphology, and observed THz emission and photocarrier dynamics lasting approximately 10 ps, with dependencies of thickness and power. Our findings reveal the nanoscale ultrafast dynamics of TIs and demonstrate THz s-SNOM’s potential to enhance compact THz device development.http://www.sciencedirect.com/science/article/pii/S2589004225001002Physical chemistryQuantum physicsQuantum theory |
| spellingShingle | Ziyu Huang Jing Li Peiyan Li Lin Du Mingcong Dai Jiahua Cai Zejun Ren Tianxiao Nie Xiaojun Wu Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy iScience Physical chemistry Quantum physics Quantum theory |
| title | Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy |
| title_full | Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy |
| title_fullStr | Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy |
| title_full_unstemmed | Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy |
| title_short | Nanoscale ultrafast dynamics in Bi2Te3 thin film by terahertz scanning near-field nanoscopy |
| title_sort | nanoscale ultrafast dynamics in bi2te3 thin film by terahertz scanning near field nanoscopy |
| topic | Physical chemistry Quantum physics Quantum theory |
| url | http://www.sciencedirect.com/science/article/pii/S2589004225001002 |
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