Terahertz intensity modulator based on low current controlled vanadium dioxide composite metamaterial

Hu, Fangrong; Rong, Qi; Zhou, Yuan; Li, Tong; Zhang, Wentao; Yin, Shengyan; Yuan-zhi, Chen; Han, Jiaguang; Jiang, Guobao; Zhu, Peidong; Chen, Ying

doi:10.1016/j.optcom.2019.02.032

Cited by 21 publications

(5 citation statements)

References 26 publications

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“…However, in practice, the modulation characteristics of the device will be affected by the processing and preparation methods. Generally, the metamaterial could be prepared by standard photolithography technique, and then VO2 could be deposited by magnetron sputtering method to form final metamaterial sample 41 , 42 . However, due to sample fabrication, such as photolithography, there may be a certain deviation between the unit size values of the device and the simulation design values, and the VO2 thin film deposited in the experiment may produce some defects.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, the metamaterial could be prepared by standard photolithography technique, and then VO 2 could be deposited by magnetron sputtering method to form final metamaterial sample. 41,42 However, due to sample fabrication, such as photolithography, there may be a certain deviation between the unit size values of the device and the simulation design values, and the VO 2 thin film deposited in the experiment may produce some defects. These may result in the actual performance of the device, such as the amplitude of EIT and EIR effects, being lower than the simulation results, and there will be a certain deviation in the peak frequency.…”

Section: Modulation Mechanism Analysismentioning

confidence: 99%

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Tunable terahertz metamaterial based on vanadium dioxide for electromagnetically induced transparency and reflection

et al. 2023

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To realize the electromagnetically induced transparency (EIT) or reflection (EIR) effect in the terahertz band, many metamaterial structures have been proposed. However, these structures usually have a single function of EIT effect or EIR effect, and it is a major challenge for a metamaterial structure to perform multiple functions. In this study, a switchable multifunctional hybrid metamaterial is proposed, which realizes the combined function of tunable EIT effect and EIR effect at THz regions through the integration of vanadium dioxide (VO 2 ) and metal metamaterial. Moreover, by changing the conductivity of VO 2 , the intensity modulations of EIT window and EIR window reach 36.11% and 50.59%, respectively. The surface current distribution and electric field responses are used to analyze the physical mechanisms of the EIT effect and the EIR effect. In addition, the active tuning mechanism of the metamaterial is theoretically explored based on the "two-particle" model. The designed hybrid metamaterial provides a simple approach to realize tunable EIT effect and EIR effect in THz metamaterials. This work opens up a possible way to achieve switchable functions (EIT or EIR) in a single device, which may find potential applications in optical switches, sensing, filtering, and slow light devices.

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Section: Resultsmentioning

confidence: 99%

Section: Modulation Mechanism Analysismentioning

confidence: 99%

Tunable terahertz metamaterial based on vanadium dioxide for electromagnetically induced transparency and reflection

et al. 2023

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“…The parameters were set in the software according to the Drude model described in the manuscript. Previous studies have reported that the conductivity of VO 2 can be increased from 200 S/m to 4 × 10 5 S/m [ 25 , 26 ]. In this paper, the conductivity of VO 2 needs to be analysed by effective medium theory (EMT).…”

Section: Methodsmentioning

confidence: 99%

Vanadium Dioxide-Based Terahertz Metamaterial Devices Switchable between Transmission and Absorption

et al. 2022

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Terahertz metamaterial plays a significant role in the development of imaging, sensing, and communications. The function of conventional terahertz metamaterials was fixed after fabrication. They can only achieve a single function and do not have adjustable characteristics, which greatly limits the scalability and practical application of metamaterial. Here, we propose a vanadium dioxide-based terahertz metamaterial device, which is switchable between being a transmitter and an absorber. The transmission and absorption characteristics and temperature tunable properties of phase change metamaterials in the terahertz band were investigated. As the temperature of vanadium dioxide is varied between 20 °C and 80 °C, the device can switch between transmission and quad-band resonance absorption at the terahertz frequency range, with a high transmission rate of over 80% and a peak absorbance of 98.3%, respectively. In addition, when the device acts as an absorber, the proposed metamaterial device is tunable, and the modulation amplitude can reach 94.3%; while the device is used as a transmissive device, the modulation amplitude of the transmission peak at 81%. The results indicate that the proposed metamaterial device can promote the applications of terahertz devices, such as switching, modulation, and sensing.

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“…It can change from the insulator state to metallic state when the temperature is above 68 °C [31], so its structural phase transition will also change and has a large strain [32]. Different applications of VO 2 have been explored a lot, such as modulator [33], temperature sensor, [34] rewritable device [35] and optical switch [36]. To date, there are little research focused on the integration of switchable and refractory functionalities in the terahertz (THz) range.…”

Section: Introductionmentioning

confidence: 99%

Switchable Wideband Terahertz Absorber Based on Refractory and Vanadium Dioxide Metamaterials

et al. 2023

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Achieving actively tunable metamaterial absorption is a significant development direction. Phase-transition materials have attracted growing interest for the use in nanophotonics owing to their flexibility. In this work, we firstly demonstrate a wideband terahertz refractory absorber that achieves more than 90% absorptance in the range of 1.71-3.31 THz. The metal composing the structure is refractory metal, which could function in high-temperature conditions and complex electromagnetic environment. Then, we incorporate phase-change material vanadium dioxide (VO 2 ) film to this refractory absorber, realizing high reflection of more than 93% in the metallic state, while the wideband perfect absorption peak over 98% is obtained in the insulating state. Calculated results show that metamaterial absorber obtains switchable functions. Furthermore, the tunable absorber has polarization-insensitive behavior. So, our designed absorber with dynamic tunable characteristics provides flexibility to adjust the absorption performance and has significant value in application. The proposed architecture offers a novel method for creating dynamic and multi-functional photonic devices in phase-change materials.

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Terahertz intensity modulator based on low current controlled vanadium dioxide composite metamaterial

Cited by 21 publications

References 26 publications

Tunable terahertz metamaterial based on vanadium dioxide for electromagnetically induced transparency and reflection

Tunable terahertz metamaterial based on vanadium dioxide for electromagnetically induced transparency and reflection

Vanadium Dioxide-Based Terahertz Metamaterial Devices Switchable between Transmission and Absorption

Switchable Wideband Terahertz Absorber Based on Refractory and Vanadium Dioxide Metamaterials

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