Detection device and detection method for hole capturing dynamics of surfaces of quantum dots
A detection device and detection method technology, which is applied in the field of laser applications, can solve problems such as difficulties in the electron or hole capture process, and achieve the effect of eliminating intensity noise
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[0051] In this embodiment, experimental sample 4 is CdS colloidal quantum dots (the luminescence peak is at 471 nm, purchased from Sigma-Aldrich Company), and the purchased sample is placed in a 1 mm thick quartz cuvette. The sample is placed in the uniform magnetic field provided by the electromagnet, and the strength of the applied transverse magnetic field is 0.5T. The wavelengths of the three beams are all set at 471nm, and the output light is passed through the optical parametric amplifier ( Topas) and BBO sum frequency or frequency multiplier, its output wavelength is continuously adjustable from 300-2700nm. The power of the first pump light pulse 1 is 0.8W / cm 2 , the power of the second pump light pulse 2 is 1.5W / cm 2 . Relative to the surface normal of the experimental sample 4, the first pumping light pulse 1 is obliquely incident at an angle of about -10 degrees, the second pumping light pulse is incident at an oblique angle of about 10 degrees, and the probe ligh...
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