Mr. Hongchao Liu Profile

Hongchao Liu

at Henan Normal Univ

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Publications (3)

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Proceedings Article | 24 November 2021 Paper

All-dielectric magnetic resonance refractive index sensor based on asymmetric cross-shaped split ring metasurface

Wenyuan Luo, Hongchao Liu, Kesheng Shen, Taiyu Yang, Xinkai Li, Chao Dong, Mengxue Su, Hai Lu

Proceedings Volume 12062, 120620B (2021) https://doi.org/10.1117/12.2604450

KEYWORDS: Sensors, Refractive index, Magnetism, Magnetic sensors, Silicon, Reflection, Metals, Waveguide modes, Resonance enhancement, Dielectrics

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A refractive index sensor is a device that can convert small changes of the refractive index into an optical signal, which usually acts as a label-free sensing technology in the field of biomedicine. The traditional optical sensor, based on refractive index sensor, could realize sensing through the interaction of light and biochemical substance on the superstructure surface. The traditional refractive index sensors are usually composed of noble metals material, and the sensing is realized by exciting surface plasmons. However, due to the ohmic loss of the metal, the quality factor and the value of the FOM of the refractive index sensor based on the metal structure are low, generally, which greatly limits the development of refractive index sensors. In this paper, the magnetic resonance refractive index sensor based on the asymmetric all dielectric cross-shaped split ring is proposed which could achieve high sensitivity and high quality factor, by inducing the metal ohmic loss and enhancing the magnetic resonance. The cross-shaped split ring metamaterial structure is applied to wireless passive sensing and is simulated by the finite element method. Simulating the interation between the incident light TE wave and the meta-surface structure produces sharp magnetic resonance peaks. We can monitor the change in the concentration of the solution around the sensor through the moving of magnetic resonance peak. For this sensor, the resonance peak wavelength is between 8680nm-8800nm in the mid-infrared, the sensitivity is 500nm/RIU, and the FOM is 909.

Proceedings Article | 28 February 2021 Paper

Research on refractive index sensing performance of all-dielectric magnetic resonance metasurface

Taiyu Yang, Hongchao Liu, Kesheng Shen, Wenyuan Luo, Xinkai Li

Proceedings Volume 11781, 117810S (2021) https://doi.org/10.1117/12.2589960

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A refractive index sensor is a device that can convert small changes of the refractive index into an optical signal. The refractive index sensor could detect the small changes of refractive index and continuously monitor its dynamic changing process. Thus, it shows great values in detecting changes of the biochemical solutions without labeling. However, ascribed to the ohmic loss, the traditional refractive index sensor based on the noble metal usually possess low sensitivity and the figure of the merit (FOM). In this paper, an all-dielectric asymmetrical double split ring refractive index sensor with high-sensitivity and FOM is designed and numerically characterized. Here, the double split ring metamaterial structure is acted as wireless passive sensing. We used the finite element method to simulate the interaction between the incident light and the metasurface. The results show that a sharp magnetic resonance peaks could be launched caused by the all-dielectric asymmetrical double split ring. And it could greatly enhance the sensitivity and the FOM contrast to the traditional one. The results show that the resonance wavelength of the sensor is between 8270 nm - 8340 nm in the mid-infrared band. And the sensitivity and FOM of the sensor can reach 662nm/RIU and 262, respectively.

Proceedings Article | 28 February 2021 Paper

Control of the dielectric constant of indium tin oxide film

Xinkai Li, Wenyuan Luo, Taiyu Yang, Hongchao Liu, Kesheng Shen

Proceedings Volume 11781, 117810E (2021) https://doi.org/10.1117/12.2591320

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Indium tin oxide is a widely used transparent conductive oxide material. It has many excellent characteristics, such as low loss in the near-infrared region, the band gap can be adjusted by doping and other methods. ITO has recently been shown to be a good substitute for metal layer, it has obvious advantages in improve the performance of optoelectronic devices and reduce the difficulty of preparation, and it makes it possible to expand the application range of optoelectronic devices based on the multilayer film system from the visible light region to the near-infrared region. Although a large number of literatures have reported the properties of ITO films, there are few studies on ITO as a substitute for the metal layer in the multilayer film system and regulating its dielectric constant properties. In this paper, ITO films were prepared by ion beam sputtering deposition at relatively low temperature, and the dielectric constant of ITO films was regulated by change the process conditions and annealing treatment. Through experiments, we realized the regulation of near-zero point in the range of 1380nm to 2420nm, and demonstrated the change rule of the dielectric constant. Compared with metal films, optical metamaterials and devices based on ITO films can not only expand their application range from the previously visible light region to the near-infrared region, but also have wider and adjustable frequency coverage

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