Mr. Hong Liu Profile

Hong Liu

at Univ of Shanghai for Science & Tehcnology

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Proceedings Article | 20 November 2014 Paper

A method of monitoring the temperature of the photoconductive antenna

Hong Liu, Yiqi Wang, Zhou Li, Yang Bai, Ting Pu, Tingting Kuang, Kejian Chen

Proceedings Volume 9300, 930016 (2014) https://doi.org/10.1117/12.2071463

KEYWORDS: Antennas, Principal component analysis, Terahertz radiation, Terahertz spectroscopy, Gallium arsenide, Electrodes, Semiconductors, Spectroscopy, Thermal effects, Split ring resonators

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Photoconductive antenna (PCA), as the most widely used emitter (or detector) in Terahertz time-domain spectroscopy (TDS) system, virtually acts as a semiconductor switch, whose electrical conductivity controlled by pump light. At the same time, the heat caused by the pump light and the electrical bias will be stacked in a tiny area. Inevitably, the thermal effects, which may reduce the performance of PCA and the operational lifetime of device, need to be considered, especially for that generated by a compact package fiber-pigtailed photoconductive antenna. Nonetheless, there still lacks of relevant reports about real-time temperature monitoring for PCA. This paper proposes a method to obtain the temperature information by observing the temperature dependent frequency drifting of radiation spectroscopy. In other words, it converts the temperature information via analyzing the radiation spectrum of the conventional TDS system. In this work, we simulate a design of meta-atom-loaded PCA with indium antimonide (InSb). As a kind of temperature-dependent permittivity of the semiconductor, InSb is stuffed into the gap of split-ring resonator (SRR). When the temperature increases from 300K to 380 K, the resonance frequency shifts from 0.582THz to 0.678THz (a shift more than 16%), calculated by the commercial software-CST. The significant blue shift is caused by the SRR loading temperature sensitive materials, well analyzed by the LC resonant circuit model. Then, one can clearly obtain the actual antenna temperature from the radiation spectrum through the relationship between temperature and resonance frequency. Always, this simply method could be applied to shift the peak frequency of spectrum for various applications.

Proceedings Article | 23 August 2013 Paper

A study of trapped mode resonances in asymmetric X-shape resonator for frequency selective surface

Kejian Chen, Hong Liu, Yiqi Wang, Yiming Zhu

Proceedings Volume 8909, 89090C (2013) https://doi.org/10.1117/12.2032882

KEYWORDS: Resonators, Terahertz radiation, Heart, FSS based metamaterials, Microwave radiation, Optical filters, Sensors, Spectroscopes, Biosensing, Reflection

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FSS is a two-dimensional periodic array of resonating metallic-dielectric structures, When FSS device steps into Terahertz range from microwave range, it is studied as THz functional components (such as Terahertz filter, Terahertz biochemical sensor, etc.) to promote the functionality of the THz spectroscopy/imaging system. When the device requires a narrow band transmission window for frequency selecting or a high electric field concentration in certain area to improve its sensitivity for sensing, normally, a high quality (Q) resonant structure can give helps. Recently, high-Q resonance induced by trapped mode resonance i studied widely in FSS research areas. To induce trapped mode resonance, one can simply break the symmetric of the unit structure of FSS. In this paper, several asymmetric X-shaped resonators for FSS working in terahertz range have been studied numerically. To compare the behaviour of X-shape resonator under different conditions (with additional part: Heart lines, Shoulder lines, Wrap or Shoes squares), a common platform (θ=60, θis angle of X shape) which is suitable for most of cases was used to make the study more meaningful. As the field enhancement behaviour is related to the trapped mode introduced by the asymmetric structure, we propose such kind of device to be used as a high quality filter or as a sensing element for biochemical samples.

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