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Your search keyword '"Yao, Jian"' showing total 3 results
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3 results on '"Yao, Jian"'

1. Sensitive Terahertz Free Space Modulator Using CsPbBr3 Perovskite Quantum Dots–Embedded Metamaterial

Author

Wang Kai-hong, Li Jiu-sheng, and Yao Jian-Quan

Subjects
010302 applied physics, Radiation, Materials science, business.industry, Terahertz radiation, Physics::Optics, Resonance, Metamaterial, Condensed Matter Physics, 01 natural sciences, 010309 optics, Photoexcitation, Optical pumping, Condensed Matter::Materials Science, Quantum dot, Modulation, 0103 physical sciences, Optoelectronics, Electrical and Electronic Engineering, business, Instrumentation, Perovskite (structure)
Abstract

We have demonstrated a method for active modulating terahertz wave using CsPbBr3 perovskite quantum dots (QDs)–embedded double-C metallic metamaterial unit cells. The resonance response frequency of the proposed CsPbBr3 perovskite QDs-embedded metamaterial can be tuned by varying the external applied photoexcitation intensity. By doing so, we measured the dynamic terahertz wave transmission modulation and demonstrate tuning of the terahertz wave resonant response based on the optical pump fluences. The modulation speed and depth of the modulator are 5 MHz and 88.3%, respectively. Our results indicate the importance of manipulating the terahertz wave for future wireless communication.

Published
2020

2. A broadband planar THz metamaterial absorber.

Author

Xu, Zong-Cheng, Gao, Run-Mei, Ding, Chun-Feng, Zhang, Ya-Ting, Wu, Liang, Xu, De-Gang, and Yao, Jian-Quan

Subjects
BROADBAND antennas, TERAHERTZ spectroscopy, METAMATERIALS, COPLANAR transmission lines, ABSORPTION
Abstract

We propose the design of a broadband planar metamaterial absorber (MA) at terahertz frequencies. The unit cell of the MA is composed of four dual-band sub-cells with different dimensions in a coplanar. The four dual-band sub-cell structures resonate at several neighboring frequencies. The absorber consists of two metallic layers separated by a dielectric spacer. Simulation results show that the metamaterial absorption at normal incidence is above 90% in the frequency of 6.56-8.10 THz. This design provides an effective way to construct broadband absorber. The multiple-reflection theory was used to explain the absorption mechanism of our investigated structures. The coupling of adjacent four dual-band sub-cells can introduce additional capacitance to affect the performance of absorber. [ABSTRACT FROM AUTHOR]

Published
2015
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3. A NECESSARY CONDITION OF FANO SWITCHING AND WAVE TRANSMISSION THROUGH THE CHAIN-STRUCTURE WITH TWO DEFECTS.

Author

YAO, JIAN-MING, WANG, SHI-LAI, WANG, JIAN-MING, and YE, CHENG-ZHI

Subjects
*SWITCHING circuits, *POINT defects, *LINEAR statistical models, *RESONANCE, *GAUSSIAN beams, *ELECTRIC interference
Abstract

We consider a discrete model that describes a linear chain of particles coupled to two defects. This model can be regarded as a linear generalization of the familiar Fano-Anderson model. The analytical result for the plane wave transmission coefficient is obtained. Comparing the transmission coefficient of Gaussian wave with that of plane wave, we can draw a conclusion that arising perfect reflection due to destructive interference depends on the input waveform of incident particle and a necessary switching condition of Fano resonance is the input plane wave. This interesting feature may play a guiding role in devising various particle switches in theory and experiment. [ABSTRACT FROM AUTHOR]

Published
2012
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