Mr. Tuo Li Profile

Tuo Li

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Proceedings Article | 6 February 2024 Paper

Investigation on the (La0.5Ta0.5)0.02Ti0.98O2 ceramics with colossal permittivity and low dielectric loss

Menglong Wang, Tuo Li, Xiaofeng Zou, Changhong Wang, Kang Su, Xing Fang, Liyan Zhou, Yongzheng Zhan, Fen Guo, Zhaojun Suo, Chao Ji, Songping Luo

Proceedings Volume 12979, 129795B (2024) https://doi.org/10.1117/12.3015733

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A series of Ta⁵⁺ and La³⁺ co-doping TiO₂ ceramics are prepared based on different annealing atmosphere and the traditional solid-state method. The crystal structure (XRD), SEM, EDS and dielectric properties are investigated based on the experiments. The rutile TiO₂ as the host phase is conformed using the X-Ray Diffraction (XRD) patterns. The crystal structure of host phase is less affected by the annealing atmosphere for all the sintered ceramics. Meanwhile, the content of secondary phase in the sintered ceramics tends to reduce. In addition, the morphology of surface of all the sintered ceramics. The results indicate that O and Ti elements uniformly distribute on the regions of SEM, and the Ta and La elements exhibit shows aggregation phenomenon due to effects of the ionic radius and solid solubility. The measuring result of dielectric properties illustrate that all the sintered ceramics possess the colossal permittivity (ε_r) and low dielectric loss (tanδ). Besides, the dielectric constant is increased from 104 to 105, while the ceramic sample is processed utilize the atmosphere annealing method, which indicate the annealing atmosphere (N₂ or N₂/H₂) can improve the dielectric properties. The frequency-dependent of dielectric properties Ta⁵⁺ and La³⁺ play an important role in colossal permittivity. Meanwhile, the behavior of colossal permittivity is attributed to the Electron Pinned Defect-Dipole (EPDD) effect.

Proceedings Article | 17 August 2023 Paper

Adjustable MMI for dynamic on-chip monitoring based on nano-opto-electro-mechanical interaction

Feng Zhang, Kejian Zhu, Pengfei Sun, Tuo Li, Xiaofeng Zou, Kai Liu, Hongtao Man, Qi Song, Lang Zhou, Chen Li

Proceedings Volume 12757, 127572K (2023) https://doi.org/10.1117/12.2690156

KEYWORDS: Waveguides, Photonics, Optical computing, Optical transmission, Refractive index, Multimode interference devices

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Energy efficiency and integration scale are two of the major challenges of current optical computing chips. To solve these problems, we propose for the first time a special multimode interference(MMI) and dynamic monitoring idea. The research of the device is based on finite element analysis. There is a nano-opto-electro-mechanical(NOEM) ratio controller in the upper left of the multimode waveguide. Most of the time, the device is in static mode with power-splitting-ratio(PSR) close to 0:100. The research shows that once the controller is started, the device enters dynamic mode with a PSR bigger than 5:95. The PSR is less than 0.36:99.64 in a selected static mode and up to 8.35:91.65 in dynamic mode. The change of PSR in dynamic mode is realized by adjusting distance between NOEM module and multimode waveguide. The footprint of the multimode waveguide is only 1.54×3.63μm² . Its minimum insertion loss(IL) is less than 0.2dB and has good process tolerance characteristics. The energy consumption of discontinuous monitoring based on the MMI is significantly lower than that of continuous monitoring. It is estimated that when duty cycle of the periodic monitoring module is 0.1 and 0.01, its monitoring energy consumption can be reduced by 70% and 97%, respectively. The MMI is expected to greatly promote the development of optical computing chips.

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