The THz emission properties of GaAs photoconductive antenna with strong electric fields

Xue, Hong

doi:10.1109/isape.2012.6408990

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…[26] The changes in the photoconductivity and current density mainly occur in the gap. [27] A yoz cross-section SΩ of the carrier concentration at the center of the gap between the metal electrodes is created to make the simulation more accurate and overcome an overestimation of the amplitude of the terahertz electric field. Once the semiconductor material is excited by an incident femtosecond laser pulse with higher energy than its bandgap, free electron-hole pairs will be generated in the semiconductor material.…”

Section: Terahertz Detection Pca Modelsmentioning

confidence: 99%

Simulation of terahertz signal reception detection based on field enhancement

Xiong,

Liu,

Shang

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

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Simulations of terahertz signals in the time or frequency domain focus on the photoconductive antenna (PCA). However, they lack a simpler and more accurate simulation technology for PCA, which plays a crucial role in designing and optimizing detectors. Such work is essential in terahertz imaging and time-domain spectroscopy (THz-TDS). This work simulates an incident terahertz wave by introducing a three-dimensional (3-D) finite-difference time-domain (FDTD) simulation in the form of a total field to scattering field. This wave is pretreated as a plane wave that is incident on the receiver. The equation of carrier dynamics with semiconductor charge and transport is solved by using the 3-D full-wave FDTD method. A center surface current method is used to calculate the time-varying conductivity. A sampling electric field was used to evaluate the photocurrent. They were obtained by convolving the main time-varying photoconductivity of the photoexcited carrier distribution on the cross-section in the middle of the gap of a PCA receiver. Then, we compare these simulations with previously reported data from an incident terahertz signal. In addition, we simulated the detection characteristics with other results in the literature. Our simulation tool can accurately reproduce these data sets.These simulations can be used to design and optimize the receiving performance of different PCAs structures before costly fabrication has commenced.

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Section: Terahertz Detection Pca Modelsmentioning

confidence: 99%

Simulation of terahertz signal reception detection based on field enhancement

Xiong,

Liu,

Shang

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

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show abstract

“…In Figure 1, the generation process of THz radiation in the PCA can be described as follows: A femtosecond laser pulse illuminates a spot in the gap between two electrodes, 18 when the photon energy of the incident femtosecond laser pulse is higher than the band gap of the semiconductor material, electron-hole pairs will be generated inside the material. Under the action of the applied bias voltage, the photoexcited carriers will be driven along the direction of the electric field to form transient current, 19 which contributes to the radiation of THz waves in the PCA.…”

Section: Physical Model and Theoretical Formulationmentioning

confidence: 99%

Numerical simulation of terahertz radiation in photoconductive antenna

Xiong

Chen

et al. 2020

Micro & Optical Tech Letters

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The terahertz radiation in photoconductive antenna involves the multiple physical processes. It is a challenge to simulate the terahertz radiation in photoconductive antenna. A numerical simulation tool for the photoconductive antenna is very necessary to effectively design and optimize the terahertz radiation source. In this paper, by introducing the auxiliary equations describing the dynamic behaviors of carriers in the semiconductor into the Maxwell's equations, we use the three‐dimensional finite‐difference time‐domain method to solve these equations and obtain the time‐domain solutions in the nearfield of antenna. A near‐to‐far‐field transformation in the layered medium is adopted in order to obtain the wave pattern of terahertz radiation in the far field. Assisted by the developed simulation tool, the terahertz time‐domain waveforms and other terahertz radiation characteristics for the photoconductive antenna can be presented. By comparing with the experimental results reported in the references, the validity and reliability of these physical models and the developed simulation tool are demonstrated. More importantly, the results given in this paper will be of great significance to design and optimize the radiation performance of photoconductive antenna with different structures.

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The THz emission properties of GaAs photoconductive antenna with strong electric fields

Cited by 2 publications

References 8 publications

Simulation of terahertz signal reception detection based on field enhancement

Simulation of terahertz signal reception detection based on field enhancement

Numerical simulation of terahertz radiation in photoconductive antenna

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