Simulation of photoconductive antennas for terahertz radiation

Paredes, Carlos Criollo; Ávila, Alba

doi:10.15446/ing.investig.v35n1.45310

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…Different PCA designs and development have been done to serve different industries and applications However, many of these designs have been numerically studied without taking the manufacturing cost in their account [3,7,10]. Furthermore, most of these simulated designs have not considered the manufacturing viability.…”

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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Section: Introductionmentioning

confidence: 99%

Modeling and Characterizing of an Enhanced Practical Terahertz Photoconductive Antenna

2022

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“…And the ECM can also be hardly used to simulate the generation of THz in the near field. Criollo et al simulated the THz emission of PCA with multiphysics processes by using COMSOL Multi‐physics 4.3b . Jitao Zhang et al numerically studied the physical mechanism of THz emission in the PCA by using three‐dimensional finite‐difference time‐domain (3D‐FDTD) method.…”

Section: Introductionmentioning

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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“…Numerous structures of photoconductive antennas have been proposed, which were based on the incorporation of optical nano antennas [17], fractal geometries [18], gammadion-type structure [19], tapered helix monopole [20], hexagonal nano-antenna [21], interdigitated metallic dipole nanoantenna [22]- [24], 3D plasmon contact electrodes [25], nano-structured electrodes [26], thin-film plasma electrode [27], rectangular metal dipole nanoantenna [28], bow-tie metallic dipole nanoantenna [28], plasmon contact electrodes [29], [30], SRR-loaded antennas [31], and arrays of bowtie and four-leaf-clover-shaped antennas [32]. Further, several numerical models have been proposed for understanding the dynamics of these photoconductive antennas, such as full-wave numerical technique based on Maxwell and hydrodynamic transport equations [33], semiconductor carrier transport and migration models [22], [34], time-domain numerical modeling [35], numerical solution of induced current based on Monte Carlo simulation [36], finite element method [27], [37], and three-dimensional full-wave model [38].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Structural Parameters of Split-Ring Resonators on the Terahertz Radiation Characteristics of Micro-Structured Photoconductive Antennas: A Simulation Study

Xiong

et al. 2020

IEEE Photonics J.

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In this study, we have theoretically designed a micro-structured photoconductive antenna based on the combination of split-ring resonator (SRR) and dipole photoconductive antenna. Further, we have used numerical simulations to prove that the proposed antenna can enhance the terahertz radiation characteristics. According to the equivalent circuit model analysis, the terahertz radiation power and the resonance frequency of this antenna were found to be closely related with the structural parameters of the SRR. A numerical model was established to simulate the effect of the structural parameters of SRR on the terahertz radiation characteristics of the proposed antenna. The results indicated that an increase in the width and length of SRR caused an increase in the peak power intensity and a decrease in the resonance frequency. Moreover, as the gap width of SRR was increased, the peak power intensity was decreased and the resonance frequency was increased. Furthermore, the terahertz radiation power increased with increase in the gap width of antennas. Overall, we show that high-power terahertz radiation sources with specific frequency can be obtained by optimizing the structural parameters of SRR, and such sources are potentially useful in a variety of fields such as biomedicine, material analysis, and detection systems.

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Simulation of photoconductive antennas for terahertz radiation

Cited by 9 publications

References 29 publications

Modeling and Characterizing of an Enhanced Practical Terahertz Photoconductive Antenna

Modeling and Characterizing of an Enhanced Practical Terahertz Photoconductive Antenna

Numerical simulation of terahertz radiation in photoconductive antenna

The Impact of Structural Parameters of Split-Ring Resonators on the Terahertz Radiation Characteristics of Micro-Structured Photoconductive Antennas: A Simulation Study

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