Characteristic of the ultra‐wideband electromagnetic radiation generated by PCSS

Ruan, Chuanmin; Zhao, Wei; Chen, Guofu; Zhu, Shaowei

doi:10.1002/mop.22393

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They have a sub-nsec rise time and a pulse width within a small number of nsec. The ultra-short rise time results in its ultra-wide spectrum, and the ultra-short pulse width allows a high peak power density without producing hyperthermia (33). Therefore, the influence of a single uWB-eMP exposure of varying electric field strength was examined on BBB permeability in the present study.…”

Section: Discussionmentioning

confidence: 99%

Effect of ultra‑wide‑band electromagnetic pulses on blood‑brain barrier permeability in rats

Gao¹,

Chen²,

Hu³

et al. 2020

Mol Med Rep

View full text Add to dashboard Cite

The restrictive nature of the blood brain barrier (BBB) brings a particular challenge to the treatment of central nervous system (cnS) disorders. The effect of ultra-wide band electromagnetic pulses (uWB-eMPs) on BBB permeability was examined in the present study in order to develop a safe and effective technology that opens the BBB to improve treatment options for cnS diseases. rats were exposed to a single UWB-EMP at various field strengths (50, 200 or 400 kV/m) and the BBB was examined using albumin immunohistochemistry and evans blue staining at different time periods (0.5, 3, 6 and 24 h) after exposure. The expression and distribution of zonula occludens 1 (Zo-1) were evaluated using western blotting to identify a potential mechanism underlying BBB permeability. The results showed that the BBB permeability of rats exposed to uWB-eMP increased immediately following uWM-eMP treatment and peaked between 3 and 6 h after UWB-EMP exposure, returning to pre-exposure levels 24 h later. The data suggested that UWB-EMP at 200 and 400 kV/m could induce BBB opening, while 50 kV/m UWB-EMP could not. The levels of ZO-1 in the cerebral cortex were significantly decreased at 3 and 6 h after exposure; however, no change was observed in the distribution of Zo-1. The present study indicated that UWB-EMP-induced BBB opening was field strength-dependent and reversible. decreased expression of Zo-1 may be involved in the effect of uWB-eMP on BBB permeability.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of ultra‑wide‑band electromagnetic pulses on blood‑brain barrier permeability in rats

Gao¹,

Chen²,

Hu³

et al. 2020

Mol Med Rep

View full text Add to dashboard Cite

show abstract

“…Photoconductive semiconductor switches (PCSS) are often used as high-speed electronic switches [1,2]. The III-V compound semiconductor PCSS have been found with a fast time response into picosecond range, which can be used for ultra-short electrical pulse generators, sampling gates, and light detectors [3][4][5][6][7]. The PCSS presents many advantages such as low trigger jitter, high-speed response to laser pulse, GHz repetition rate, low inductance and capacitance, and also optical isolation of the triggering.…”

Section: Introductionmentioning

confidence: 99%

Characterization of photoconductive semiconductor switches under nonlinear mode condition

Ruan

Zhao

Zhu

et al. 2008

Micro & Optical Tech Letters

Self Cite

View full text Add to dashboard Cite

Time jitter characteristics of GaAs photoconductive semiconductor switch in linear mode

Gui¹,

Wei²

2018

Acta Phys. Sin.

View full text Add to dashboard Cite

Time precision switching is crucial to a high-precision synchronization control system with several synchronized sources. Compared with the other high-power switches, a GaAs photoconductive semiconductor switch (PCSS) with a litter time jitter has been widely used in a precision synchronization control system. There is little work on the time jitter of a GaAs PCSS. In this paper, a formula of GaAs PCSS time jitter is derived by the qualitative theoretical derivation through using the probability distribution of the output electrical pulse and the corresponding relation between the time and electrical waveform of GaAs PCSS, and combining the carrier transport process. In experiment, a neodymium-doped yttrium aluminum garnet nanosecond laser beam is split by a semipermeable half mirror into two optical beams, and then these two beams simultaneously trigger two identical GaAs PCSSs in two parallel circuits. As the energy of a triggering laser pulse is fixed at 0.35 mJ, four different laser pulse widths, namely 30 ns, 22 ns, 16 ns and 11 ns, respectively, are used to trigger the GaAs PCSSs. The bias voltage changes from 0.1 kV to 1 kV in steps of 0.1 kV, and it is used in the above-mentioned experiment. The PCSSs are triggered 20 times at each of the bias voltage values. The time jitter of the GaAs PCSS with a 3-mm gap can be measured. By analyzing the experimental data, we conclude that the time jitter of the GaAs PCSS decreases with the triggering laser pulse width decreasing under the condition of different bias voltage. In the linear mode, the GaAs PCSS illuminated by a photon with a proper wavelength creates an electron-hole pair. The characteristic of the triggering laser pulse determines that of the output electrical pulse. With the energy of triggering laser pulse fixed, the fluctuation of electrical pulse increases fast with its pulse width decreasing. Moreover, according to the derived formula for a time jitter, the GaAs PCSS time jitter decreases with triggering laser pulse width narrowing, under the different externally applied bias voltages. It is demonstrated that the theoretical and experimental results of the relationship between the triggering laser pulse width and the GaAs PCSS time jitter are consistent. The obtained results provide a basis for further reducing the GaAs PCSS time jitter, which is important for a next-generation fusion research facility and laser trigger antenna array of generating short pulse sequence.

show abstract

Characteristic of the ultra‐wideband electromagnetic radiation generated by PCSS

Cited by 3 publications

References 9 publications

Effect of ultra‑wide‑band electromagnetic pulses on blood‑brain barrier permeability in rats

Effect of ultra‑wide‑band electromagnetic pulses on blood‑brain barrier permeability in rats

Characterization of photoconductive semiconductor switches under nonlinear mode condition

Time jitter characteristics of GaAs photoconductive semiconductor switch in linear mode

Contact Info

Product

Resources

About