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- Title
Femto Seconds Laser Based Efficient THz Generation from Different Temperature Annealed CdTe Thin Films and Effects of Carrier Concentration and Phase Transition on Efficiency of Generation.
- Authors
Mahendar, M.; Vamsi Krishna, R. N.; Chaudhary, A. K.
- Abstract
The paper reports the thermal evaporation based growth process of CdTe thin films on glass substrates. These films were annealed between room temperature to 200, 300 and 400 o C, respectively. The XRD characterization of these films revealed the change in crystalline phase from cubic to triclinic above 200 o C. Finally, these films were subjected to 800 nm wavelength of 35fs pulsed obtained from Ti: sapphire amplifier at 1kHz repetition rate. The incident power of the laser was focused and tuned between 150-350 mW range and generated THz signals were recorded using calibrated Pyroelectric detector at 22.5 Hz frequency. The highest power of the THz signal was 80nW for 200 o C annealed film with respect to incident power of 300mW. The highest efficiency of THz signal was of the order of 3.11E-5%. We have also explained the effect of carrier concentration and phase transition with respect to different annealed temperature for efficient generation of THz signal.
- Subjects
THIN films; GLASS; PYROELECTRIC detectors; PHASE transitions; ELECTRONIC amplifiers
- Publication
Indian Journal of Pure & Applied Physics, 2022, Vol 60, Issue 5, p401
- ISSN
0019-5596
- Publication type
Article