Research on Photogenerated Carrier Dynamics in Gallium Antimonide Based on Optical Pumping-Terahertz Detection
This study investigates the photogenerated carrier dynamics in gallium antimonide(GaSb)crystals using reflective optical pumping-terahertz detection technology.First,we examined fluctuations in terahertz time-domain peak intensity caused by varying the energy density pump light at a wavelength of 400 nm.Based on results of this examination,we derived the recombination time of photogenerated carriers in GaSb crystal.Next,we recorded the terahertz time-domain spectrum of GaSb crystals under different energy-density pump light conditions at a wavelength of 400 nm.This helped in calculating the GaSb conductivity in the terahertz frequency band.Finally,by leveraging the Drude-Smith model,we conducted conductivity fitting and extracted key parameters,including the Smith parameter and carrier scattering time.This study provides valuable insights into GaSb material modification and related detector manufacturing.
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