Electro-optically Induced and Manipulated Terahertz Waves from Fe-doped InGaAs Surfaces
| Autor: | O. Hatem |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Radiation
Materials science business.industry Terahertz radiation Physics::Optics Optical polarization 02 engineering and technology Optical field 021001 nanoscience & nanotechnology Condensed Matter Physics Laser 01 natural sciences law.invention 010309 optics Optical rectification Wavelength law 0103 physical sciences Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Instrumentation Refractive index Ultrashort pulse |
| Zdroj: | Journal of Infrared, Millimeter, and Terahertz Waves. 39:250-261 |
| ISSN: | 1866-6906 1866-6892 |
| DOI: | 10.1007/s10762-017-0456-0 |
| Popis: | We demonstrate the presence of dual simultaneous nonlinear mechanisms: field-induced optical rectification (FIOR) and field-induced surge current (FISC) for the generation of terahertz (THz) pulses from p-type and n-type Fe:In0.53Ga0.47As surfaces upon excitation with femtosecond laser pulses centered at 800 nm wavelength. Experimental investigations of the dependence of the generated THz waves on the incident angular optical polarization, optical irradiance, and the direction and magnitude of applied electric DC fields give confirming results to the proposed THz generation mechanisms. Applying external DC electric fields in the plane of the incident optical field shows efficient capability in manipulating the direction and phase of the generated THz waves, and controlling the refractive index of Fe:In0.53Ga0.47As material in the THz range, in addition to enhancing the emitted THz power up to two orders of magnitude. The fast and reliable response of Fe:In0.53Ga0.47As to the changes in the direction and magnitude of the optical and electrical fields suggests its use in amplitude and phase modulators, and ultrafast optoelectronic systems. |
| Databáze: | OpenAIRE |
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