Polarization resolution fluorescence testing system based on three-dimensional movable light path

Abstract

The invention discloses a polarization resolution fluorescence test system based on a three-dimensional movable light path, which comprises a laser generation assembly used for generating exciting light; the laser polarization adjusting assembly is used for adjusting the polarization state of the exciting light; the optical filter is used for reflecting the exciting light and transmitting fluorescent light emitted by a sample; the three-dimensional independent light path displacement assembly is used for adjusting a light path in a three-dimensional manner so as to focus a light spot to independently move on the surface of the sample on the x axis, the y axis and the z axis; the microscope system is used for carrying out illumination and microscopic imaging on the surface appearance, the exciting light and the fluorescent light of the sample; the fluorescence polarization adjusting assembly is used for adjusting the polarization state of fluorescence; and the spectrum detection module is used for detecting the spectrum and the service life of the fluorescence. The device has the characteristics that a sample does not move and a light path moves, can be compatible with most non-displaceable cryostats on the market, and realizes any circular polarization or linear polarization fluorescence detection by adopting polarization adjustable components and a small-angle incidence mode.

Description

technical field [0001] The invention relates to the technical field of fluorescence spectrum detection, more particularly, to a polarization-resolved fluorescence testing system based on a three-dimensional movable optical path. Background technique [0002] As a type of fermions, electrons naturally have two intrinsic properties: charge and spin. The development of charge-type devices and spin-type devices by carrying information with the charge and spin of electrons is the cornerstone of the current information technology industry. With the advent of the information age, many practical demands such as larger capacity, faster transmission, and lower power consumption not only promote the progress of the industrial technology chain, but also stimulate people's enthusiasm for exploring new electronic degrees of freedom in the field of basic research. In recent years, with the emergence of two-dimensional materials such as graphene and transition metal chalcogenides, new elec...

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Problems solved by technology

[0005] In addition, in terms of polarization detection, there are also two major problems to be solved. One is that the excitation light and fluorescence will experience a large number of reflections from optical lenses in the system. How to ensure that the excitation light incident on the sample and reflected to the entrance of the spectral detector The polarization degree of the fluorescence at the place; the second is that the general spectrometer uses a wire grid grating for wavelength resolution, which itself has different polarization response characteristics to the fluorescence of different wavelengths. How to reduce the systematic polarization detection error caused by the spectral detection device

[0006] There is a huge demand for research on low-temperature polarization fluorescence spectroscopy detection of current low-dimensional semiconductor materials, and traditional fluorescence spectroscopy testing systems cannot meet the measurement requirements

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