Qingmao Zhang

South China Normal University

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Jiaming Li

University of Science and Technology of China

Guo Liang

South China Normal University

Nan Zhao

Guangdong Polytechnic Normal University

Qiongxiong Ma

South China Normal University

Shangming Ou

South China Normal University

Haibing Xiao

Shenzhen Institute of Information Technology

Xuyun Peng

Ganzhou People's Hospital

Zhongmin Liu

South China Normal University

Qinghang Lu

China Mobile (China)

Liang Guo

Nanjing Tech University

Cooperative Institutions

South China Normal University

121

Chinese Academy of Sciences

Jinan University

Harbin Institute of Technology

Peking University

Huazhong University of Science and Technology

Sun Yat-sen University

Southern University of Science and Technology

Central South University

University of Chinese Academy of Sciences

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Universal Analytical Modeling of Terahertz Graphene Metasurfaces

Zhongmin Liu Liang Guo Qingmao Zhang

Control over the optical response of graphene metasurfaces enables many promising applications in terahertz devices, including beam filters, polarizers, and absorbers. In this paper, we provide an analytical theory that enables us to use equivalent circuit models to simulate these responses. Closed-form expressions are provided for their associated scattering spectra, including an infinity of parallel R-L-C circuits for each metasurface morphology, which are calculated and tabulated once and for all. These models' accuracy is verified by comparing their results with those that are derived from full-wave simulations. Moreover, applications of these models are presented to anticipate both tunable optical response in interacting graphene disks and refractive index sensing via the response of graphene squares to ambient media. These models open up a new way of controlling the structure's performance and refining it to meet our application-specific requirements.

10.2139/ssrn.4631328

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Sensitive and reproducible on-chip SERS detection by side-polished fiber probes integrated with microfluidic chips

Measurement (2023)

Hongyu Li Rang Chu Jinyuan Cao Fei Zhou Kuikui Guo

Microfluidic chip

10.1016/j.measurement.2023.113203

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Citations (8)

Manufacturing and verification research for engine compartment rear structure based on AC729RTM polyimide composites

复合材料学报 (2021)

Qingmao Zhang Dongsheng Jin Jian Gan Peng Zhang Jianwen Bao

In view of the structural deformation, weight and high-temperature requirements in the application of Titanium engine compartment rear structure of a certain aircraft. Carried out composite structural design instead of titanium alloy for aircraft engine compartment rear structure, taking the AC729RTM polyimide composite with temperature resistance of 350℃ as design material. The finite element (FE) model of composite engine compartment rear structure was generated to perform parameter analysis and obtained reasonable structural design parameters. The composite engine compartment rear structure was fabricated by resin transfer molding process (RTM). Finally, verification and evaluation were carried out from static strength test, structural deformation and weight. The results show that the internal quality and appearance of polyimide composite engine compartment rear structure are in good condition except for pores of small areas (porosity <2%) through non-destructive inspection. There were no obvious damages in engine compartment rear structure except for debonding of small areas through verification of static strength test, and satisfied the requirement of room temperament strength. The shape deviation of composite engine compartment rear structure was controlled in -0.808 mm~0.664 mm and was bettered than titanium alloy structural. Compared with titanium alloy structural, the weight was reduced by 27.5% and achieved good benefits.

Transfer molding

Titanium alloy

Molding (decorative)

Compartment (ship)

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Design and simulation of optical system for novel LED solar simulator

Journal of Applied Optics (2019)

ZHANG Xinqiang Qingmao Zhang Liang Guo Zhiqing Zhang Yiqin Xu

针对现有LED太阳模拟器同时解决准直性、辐照度均匀性、光谱匹配性三大技术指标的难度较高的问题，基于光电一体化二次光学设计，提出一种简便、高效且可实现大功率的LED太阳模拟器光学系统设计方法。采用小角度准直透镜和抛物面镜来整合光源，通过混光棒和微结构进行匀光，最后利用抛物面镜实现光线的准直输出，基于同轴准直的设计思想完成LED太阳模拟器的设计。利用光学软件LightTools对LED太阳模拟器光学系统进行模拟仿真与分析优化，实验结果表明：在直径为260 mm的有效辐照面上辐照不均匀度为2.5%、准直角为1.5°。

Solar simulator

LED display

10.5768/jao201940.0505004

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Welding between rough copper foil and silica glass using green femtosecond laser

Optics & Laser Technology (2024)

Jingyu Huo Zirong Zeng Jinhui Yuan Minghuo Luo Ai‐Ping Luo

Silica glass

10.1016/j.optlastec.2024.111804

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Analytical method for designing tunable terahertz absorbers with the desired frequency and bandwidth

Optics Express (2021)

Zhongmin Liu Liang Guo Qingmao Zhang

We present a novel and effective approach for designing and analyzing graphene metasurface-based terahertz absorbers with the desired central frequency and fractional bandwidth. Narrowband and broadband absorbers are designed using the same configuration with a single-layer of graphene ribbons deposited on a metal-backed dielectric film. An analytical circuit model derived for the graphene array applies the impedance matching concept to realize the desired terahertz absorber. Absorbers with a fractional bandwidth ranging from 10-100% are realized at the 1-THz central frequency. The results show excellent agreement with those calculated using full-wave numerical simulations. The proposed method is promising for terahertz imaging, sensing, and filtering applications.

Narrowband

Wideband

Center frequency

10.1364/oe.442425

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GHz-repetition-rate fundamentally mode-locked, isolator-free ring cavity Yb-doped fiber lasers with SESAM mode-locking

Optics Express (2022)

Shangming Ou Zhenqin Yu Guo Liang Qingmao Zhang Nan Zhang

A novel fundamentally mode-locked, GHz-repetition-rate ring cavity Yb-doped femtosecond fiber laser is demonstrated, which utilizes polarization-maintaining gain fiber and is enable by SESAM mode-locking. Thanks to the isolator-free structure, the ring cavity laser is operated bidirectionally and the two polarization-multiplexed output pulse trains are demonstrated synchronous. As a result, tunable waveforms one of which is with reduced pedestal and shorter pulse width in comparison with each individual, are generated by combination of the two orthogonal-polarized output pulses. Furthermore, a similar ring cavity structure that generates GHz picosecond pulses is demonstrated. We believe such high-repetition-rate polarization-multiplexed mode-locked fiber lasers could find further uses in various applications in need of gigahertz repetition rate and tunable waveforms.

Isolator

Mode-Locking

10.1364/oe.471813

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Accurate two-dimensional simulation model and experimental demonstration in ultraviolet picosecond laser scribing ablation

Optics Express (2024)

Zhiying Xu Nan Zhao Caijie Zhang Shixian Cai Kai Wang

Laser patterning of copper thin films is essential for the electronics manufacturing industry. In this work, to efficiently and accurately describe the physics process of UV-ps laser ablating copper thin film, a two-temperature model (TTM) consisting of the electron-lattice system and phase explosion mechanism was proposed. The process of electron heating and electron-lattice heat transfer in single pulse ablation were revealed. The average relative errors (ARE) of simulated ablation depth and width were 6.24% and 4.82%, respectively. The process of laser scribing ablation presents the characteristics of repeated ablation in the overlapping ablation region and new ablation in the non-overlapping region. The physics essence of laser scribing is the multiple laser ablations with different energies on the cross-section. The laser scribing cross-section ablation was simulated on 2D TTM. Compared with 3D simulation, though the ARE of ablation depth and width of 2D simulation slightly increased from 15.81% and 5.69% to 18.96% and 8.76%, respectively, the average solving time decreased significantly, from 81960 s to 2140 s. This comprehensive study aims to offer some insights into the characteristics of UV-ps laser ablation of copper thin film.

Laser Ablation

Picosecond

10.1364/oe.524351

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Experimental study of pulsed laser bending process parameters of 6061 aluminum alloy sheet

Materials Research Express (2018)

Lianggang Guo Peng Cai Hao Wang Yao Chen Qingmao Zhang

Pulsed laser

10.1088/2053-1591/aafae7

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Citations (3)