Numerical simulation of terahertz radiation in photoconductive antenna

Xiong, Zhonggang; Hu, Deng; Chen, Junxue; Chen, Linyu; Liu, Quanchen; Guo, Jin; Shang, Liping

doi:10.1002/mop.32318

Cited by 4 publications

(2 citation statements)

References 28 publications

(55 reference statements)

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“…The antenna electrode is regarded as a perfect conductor. The optical intensity is 5 W/µm 2 which is far from the trap saturation conditions, [35] The excitation spot is in a Gaussian shape. The femtosecond laser excitation position of the receiving PCA is in the middle of the interpole gap with a radius of 2.5 µm.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…Terahertz technology can be used in different industries including medical industry, aerospace industry, wood products industry and semiconductor industry [19], which is lying in between the microwave and optical regions (0.1-10 THz) [1]. Those applications allow to explore how matter interacts with THz radiation.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Characterizing of an Enhanced Practical Terahertz Photoconductive Antenna

2022

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Optical generation can be divided into photoconductive generation and optical rectification. Moreover, the generation of photoconductive is more efficient than optical rectification when standard laser oscillator systems are used. At photoconductive antenna (PCA), the efficiency and terahertz (THz) power generated are affected by different parameters (e.g. incident power of laser pump, dielectric properties and the applied DC bias voltage difference). In this research, four proposed designs of PCAs are presented and compared. Furthermore, microfabrication aspects and concerns have been considered in this study, which are rarely presented in the literature. Therefore, effects of different parameters are shown in this work such as adding adhesion layer in between electrodes and the substrate, varying of gap properties and dipole length. Output frequency, photocurrent and the total effective energy of different antenna models at different values of laser power have been studied and compared.

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