| Title |
Transient anisotropic photoconductivity and terahertz pulse generation from semiconductors / |
| Translation of Title |
Fotolaidumo anizotropijos ir terahercinių impulsų generavimo puslaidininkiuose dinamika. |
| Authors |
Malevich, Yury |
| Full Text |
|
| Pages |
129 |
| Keywords [eng] |
Generation of terahertz radiation ; semiconductors ; anisotropic ; photoconductivity ; picosecond |
| Abstract [eng] |
The purpose of work presented in this thesis was to study the transient anisotropic photoconductivity in cubic semiconductors excited by femtosecond laser pulses and to investigate how this effect is manifested in emission of THz radiation from the semiconductor surface. The existing notion of the transient picosecond photoconductivity is far from complete in spite of the intensive study of this phenomenon. For example, the influence of the optical alignment of photocarriers over momenta on the transient photoconductivity has not been properly investigated. Meanwhile, as shown in this work the anisotropic momentum distribution of photocarriers can have a dramatic effect on the photocarrier dynamics during the first few hundred femtoseconds after photoexcitation. It has been shown in this work that the anisotropic transient photoconductivity in cubic semiconductors excited by femtosecond laser pulses is determined by photocarrier dynamics on a subpicosecond time scale and plays a significant role in THz emission from semiconductors. The study of this phenomenon gives us a better insight into ultrafast electronic processes which are of fundamental importance to the operation of high-speed semiconductor devices having a picosecond response time. |
| Dissertation Institution |
Vilniaus universitetas. |
| Type |
Doctoral thesis |
| Language |
English |
| Publication date |
2016 |
