All-optical broadband terahertz modulator based on CdS NWs/Si heterojunction and interface photoconductivity analysis
Abstract A high-performance, low-cost terahertz modulator is fabricated by spin-coating CdS nanowires onto silicon. This all-optical modulator achieves broadband modulation (0.4–1.6 THz) with a significant depth of 85% at a low power density (2 W cm −2 ), exceeding bare silicon by fourfold. THz-TDS confirms its terahertz amplitude modulation capability. Tests of the simple photonic switch further illustrate the modulator’s potential for carrying information on a terahertz transmission wave. The modulation mechanism is explained through energy band theory and photoconductivity data. This work also presents a novel method for probing heterostructure formation using THz-TDS with laser irradiation.
Authors
- Qing Han (ORCID: https://orcid.org/0000-0001-5778-094X)
- Bing Jin (ORCID: https://orcid.org/0009-0005-1040-8012)
- Ao Li
- Xiaoxiao Li (ORCID: https://orcid.org/0000-0001-7214-268X)
- Pengfei Fang (ORCID: https://orcid.org/0000-0001-6836-0318)
- Shuhan Li
- Bumaliya Abulimiti (ORCID: https://orcid.org/0000-0002-7274-2797)
- Minjie Zhou (ORCID: https://orcid.org/0000-0003-2075-9826)
- Yue Tan (ORCID: https://orcid.org/0000-0002-3020-4077)
- Fan Zhang (ORCID: https://orcid.org/0000-0001-6393-5960)
- Zhiqiang Li (ORCID: https://orcid.org/0000-0002-3283-6385)
- Lili Yan (ORCID: https://orcid.org/0000-0003-4491-1853)
Institutions
- Xinjiang Normal University (CN)
- Shandong University (CN)
- Wuhan University of Technology (CN)
- Institut des Sciences Moléculaires (FR)
- Henan Institute of Science and Technology (CN)
- Shandong University of Science and Technology (CN)
Publication Details
- Journal
- Physica Scripta
- Published
- 2024-09-27
- DOI
- https://doi.org/10.1088/1402-4896/ad80e2
- Citations
- 6
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 1.25
Funders
- National Natural Science Foundation of China