Journal
ISCIENCE
Volume 25, Issue 9, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.isci.2022.104898
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Funding
- National Key R&D Program of China [.2021YFB3200100]
- Natural Science Foundation of China (NSFC) [61575131]
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In this study, a THz microfluidic chip was fabricated using cycloolefin copolymers with high transmission of THz waves. The THz modulation characteristics of TiO2, Ag, and Fe3O4 nanosols under different fields were investigated. It was found that all three nanosols exhibited broadband modulation performance.
Recently, with the widespread application of metamaterials in the terahertz (THz) modulation field, solid-state THz modulators have made breakthrough progress; however, there are still challenges in preparing flexible THz modulators with wide modulation bandwidths. In this study, a THz microfluidic chip was fabricated using cycloolefin copolymers with high transmission (90%) of THz waves. The THz modulation characteristics of TiO2, Ag, and Fe3O4 nanosols under the control of an optical field, electric field, and magnetic field, respectively, were investigated. Under the action of photogenerated carrier migration, colloidal electrophoresis, and magneto-optical effect, all three nanosols exhibit broadband modulation performance in the frequency range of 0.3-2.4 THz, and the maximum modulation depth is 24%, 33%, and 54%, respectively. Contrary to previous studies based on traditional solid-state materials, this study innovatively explores the possibility of modulating THz waves with liquid materials, laying the foundation for the application of flexible liquid-film THz modulators.
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