Journal
APPLIED PHYSICS LETTERS
Volume 115, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5129073
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Funding
- National Natural Science Foundation of China (NSFC) [61735006, 61905007]
- Wuhan National Laboratory for Optoelectronics [2018WNLOKF001]
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Fano resonance is widely discussed in designing functional terahertz components, such as sensors, filters, modulators, and group delay modules. Usually, a high quality (Q) factor and flexible tunability of Fano resonance are key requirements for these applications. Here, we present tunable terahertz Fano resonance with a Q factor of 2095 at 0.439 THz in coupled terahertz whispering-gallery-mode resonators (WGMRs). Coupling between a relatively low Q (578) quartz ring and a high Q (2095) silicon ring is employed to generate high Q Fano resonance. The resonant frequency of the Fano resonance can be actively manipulated by tuning the resonant frequency of the high Q WGMR, which is achieved through utilizing an electrical thermo-optic tuning method; meanwhile, the resonance intensity of the Fano resonance can be engineered by adjusting the coupling strength between two WGMRs. This coupled-WGMR scheme delivers tunable high Q Fano resonance and may contribute to the design of high-performance configurable terahertz devices. Published under license by AIP Publishing.
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