Transmission electron microscope sample rod system with ultrafast time-resolved spectrum capability and application
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A technology of time-resolved spectroscopy and electron microscopy, which is applied in the fields of microscopy, optics, and analytical materials, and can solve problems such as direct correlation of material properties and single function
Active Publication Date: 2021-03-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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However, commercial electron microscopes only have the ability to characterize structures, and h
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Embodiment 1
[0047] This embodiment is used to illustrate the structure of the transmission electron microscope sample rod system of the present invention.
[0048] The present invention relates to transmission electron microscope sample holder systems with ultrafast time-resolved spectroscopy capabilities such as figure 1 As shown, it includes: a femtosecond laser 1, a beam expander collimator 2, a first flip mirror 3, a dispersion compensation element 4, a second flip mirror 5, a mirror 6, a first dichroic prism 7, and a microscope objective lens 8 , the sample bar 9 that fiber optic bundle is installed, white light source 10, the first lens 11, the second dichroic prism 12, the second lens 13, the third flip mirror 14, image acquisition device 15, optical filter 16, spectrometer 17, The third lens 18, the time-correlated single photon counter 19, the auxiliary optical imaging system 20; the detailed information of the sample rod part equipped with the fiber bundle is as attached figur...
Embodiment 2
[0053] This embodiment is used to illustrate the use method of the transmission electron microscope sample rod system of the present invention.
[0054] The specific implementation steps are as follows:
[0055] Step 1: The horizontally polarized light emitted by the femtosecond laser is first transformed into quasi-parallel light through the beam expander and collimator 2;
[0056] Step 2: passing the quasi-parallel femtosecond pulsed light obtained in step 1 through a grating pair to generate negative group velocity dispersion;
[0057] Step 3: focusing the broadened pulse light caused by the negative group velocity dispersion obtained in step 2 through the microscope objective lens 8 to the near end of the optical fiber bundle installed in the sample rod;
[0058] Step 4: irradiate the entire end face of the proximal end of the optical fiber bundle with the white light source 10 through the lens and the microscope objective lens 8;
[0059] Step 5: adjust the proximal end...
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Abstract
The invention discloses a transmission electron microscope sample rod system with ultrafast time-resolved spectrum capability, which at least comprises an optical system consisting of a sample rod provided with an optical fiber, an ultrafast laser, a dispersion compensation element, a spectrograph, a time-dependent single photon counter and the like, and an mechanical system composed of a piezoelectric ceramic tube, a differential micrometer head, a three-dimensional displacement table and the like. The optical system and the mechanical system are used for achieving in-situ focusing of pulsedlight and three-dimensional scanning of focusing light spots in a transmission electron microscope, signals such as fluorescence and the like are excited and collected through the sample rod providedwith the optical fiber, and finally the fluorescence spectrum and the fluorescence lifetime are measured through the spectrograph and the time-dependent single-photon counter. The transmission electron microscope sample rod system with the ultrafast time-resolved spectrum capability is realized and is used for introducing focused femtosecond pulse light into a transmission electron microscope to perform fluorescence spectrum characterization and fluorescence lifetime measurement, so that ultrafast spectroscopy measurement is completed in the transmission electron microscope.
Description
technical field [0001] The present invention relates to the technical field of transmission electron microscope accessories, in particular to a transmission electron microscope sample rod system with ultrafast time-resolved spectral capabilities and its application, more specifically, to a transmission electron microscope with ultrafast pulse optical focusing and ultrafast time-resolved spectral capabilities. Electron microscope sample rod and corresponding transmission electron microscope system. Background technique [0002] Exploring the correspondence between the structural properties of materials and their physical properties is one of the hotspots in the research of condensed matter physics. In the study of condensed matter physics, when the scale of a solid approaches its quantum characteristic length in one or more dimensions, due to the influence of quantum confinement effect and quantum fluctuation effect, it will show electronic structure characteristics that are ...
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