Microscopic transient angle-resolved reflectance / transmission spectroscopy measurement system based on streak camera

The microscopic transient angle-resolved reflectance/transmission spectroscopy measurement system based on a streak camera solves the problem of the lack of time resolution in angle-resolved spectroscopy measurement systems, and realizes ultrafast dynamics research on exciton polaritons and surface plasmon polaritons. It can analyze light signals from three dimensions: time, angle and wavelength, and determine the light-matter coupling state of the sample.

CN116337828BActive Publication Date: 2026-05-26BEIJING INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INST OF TECH
Filing Date
2023-02-07
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing angle-resolved spectral measurement systems lack time resolution, making it impossible to effectively study the ultrafast dynamics of exciton polaritons and surface plasmon polaritons.

Method used

A microscopic transient angle-resolved reflection/transmission spectroscopy measurement system based on a streak camera is adopted. By combining the reflection/transmission excitation optical path, the collection optical path and the microscopic illumination module with the streak camera, the time, angle and wavelength are resolved. The optical signal is resolved by using a grating, so as to realize the acquisition of transient angle-resolved spectra at different times.

Benefits of technology

It can achieve ultrafast dynamic analysis of diagonally resolved spectroscopy, obtain information on time, angle and wavelength, comprehensively analyze the response state of the sample to excitation light, determine the coupling state of light and matter, and support the testing of transient fluorescence spectroscopy and transient absorption spectroscopy.

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Abstract

This invention discloses a microscopic transient angle-resolved reflection / transmission spectroscopy measurement system based on a streak camera, belonging to the field of microscopic angle-resolved spectroscopy measurement. The invention includes a reflection excitation optical path, a transmission excitation optical path, a collection optical path, and a microscopic illumination module. The reflection / transmission excitation optical path converts a pulsed laser source into a broadband pulsed white light source and focuses it onto the sample surface. The collection optical path achieves time resolution through a streak camera, angle resolution through a pinhole on the k-space plane, and wavelength or energy resolution through a grating. The microscopic illumination module illuminates the sample to determine its position. This invention can acquire transient angle-resolved spectra at different times, analyze the ultrafast dynamics of angle-resolved spectra, and simultaneously acquire information in three dimensions: time, angle, and wavelength. By analyzing the light signal from these three dimensions, it can comprehensively analyze the sample's response to the excitation light and thus determine the coupling state between light and matter in the sample.
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