Spatially-separated pump-probe transient absorption spectrograph and realization method

Abstract

The invention discloses a spatially-separated pump-probe transient absorption spectrograph and a realization method. The realization method is characterized by generating a light source through a femtosecond light source system; realizing the beam splitting of pump light and probe light through a beam splitter; realizing the different time delay of the probe light through a time delay line; realizing the two-dimensional rotation and the calibration of the probe light within a horizontal plane and a vertical plane through a sweep reflector group; calibrating which means guaranteeing the incidence of the rotated probe light into a aperture within the front section of an objective lens; finally, obtaining a two-dimensional image formed on a sample under the combined action of the probe light and the pump light by a data collection system. According to the spatially-separated pump-probe transient absorption spectrograph and the realization method, the extremely high spatial discrimination can be realized, and moreover, the visual probe of carriers, excitors or plasmons can be realized.

Description

technical field [0001] The invention relates to a space-resolved spectral detection technology, in particular to a space-separated pump-detection transient absorption spectrometer and its implementation method, which can be used to realize carriers, excitons, hot electrons or plasmons visual detection. Background technique [0002] In the current field of nanoscience and nanotechnology, the pursuit of small device size, high speed, and low energy consumption is crucial in many fields such as nanophotonics, nanoelectronics, and solar energy conversion. Premises and foundations of optoelectronic devices. However, in the process of interaction between light and nanomaterials, such as the interaction between light and semiconductor nanomaterials, metal nanomaterials, composite nanostructures, etc., the generation of photogenerated carriers on the surface of nanomaterials and their The dynamics of spatial diffusion, migration, and recombination are closely related to the behavi...

AI Technical Summary

Problems solved by technology

At present, the application of pump-probe technology in the field of nanomaterials has the following two shortcomings: First, it is often impossible to obtain high spatial resolution without the aid of a microscope system.

For example, the current ultrafast time-resolved spectroscopy technology cannot be specific to the detection of ultrafast processes dependent on morphology and structure, and often can only detect the macroscopic average behavior of a large number of nanomaterials; - The detection technology achieves spatial resolution to a certain extent, but the pump light and the probe light cannot achieve spatially separated detection, that is, the detection of dynamic processes such as carriers, excitons, or plasmons cannot achieve carrier Intuitive visualization of the movement process

Images