標題: | Gap-Dependent Terahertz Pulses from Mid-Size-Gap Multi-Energy Arsenic-Ion-Implanted GaAs Antennas |
作者: | Chou, Rone-Hwa Pan, Ci-Ling 光電工程學系 Department of Photonics |
關鍵字: | photoconductive antenna;terahertz;multi-energy arsenic-ion-implanted GaAs (multi-GaAs:As(+));femtosecond;full-wave model;space-charge screening |
公開日期: | 1-十一月-2008 |
摘要: | We investigated the characteristics of sub-picosecond radiation pulses from mid-size-gap multi-energy arsenic-ion-implanted GaAs photoconductive antennas in terahertz time-domain spectroscopy experiments. At fixed fluence excitation, both the bandwidth and the negative peak of terahertz waveform minimum reveal increasing trends with increases in the antenna's gap. We reproduce both the measured terahertz waveforms and increasing trends numerically, by calculating a model that incorporates the trap-enhanced bias field with wave equation. We deduce from our simulation that the gap-dependent behavior stems from the fact that an antenna with a larger gap has a stronger trap-enhanced bias field near the anode edge and thereby induces a larger space-charge screening effect and bandwidth. [DOI: 10.1143/JJAP.47.8419] |
URI: | http://dx.doi.org/10.1143/JJAP.47.8419 http://hdl.handle.net/11536/8222 |
ISSN: | 0021-4922 |
DOI: | 10.1143/JJAP.47.8419 |
期刊: | JAPANESE JOURNAL OF APPLIED PHYSICS |
Volume: | 47 |
Issue: | 11 |
起始頁: | 8419 |
結束頁: | 8425 |
顯示於類別: | 期刊論文 |