chanelink logo
CHANELINK
Русский

High sensitivity visualization of ultrafast carrier diffusion using a wide field holographic microscope

531
2023-12-25 14:16:07
Посмотреть перевод

A sketch of the imaging and holographic parts of a transient holographic microscope, including a pulse sequence, to illustrate the signal modulation method. By imaging the pinhole array at the sample position, a diffraction limited excitation spot array can be created, allowing for the simultaneous collection of transient data around 100 excitation spots.

Femtosecond transient microscopy is an important tool for studying the ultrafast transport characteristics of excited states in solid samples. Most implementations are limited to photoexcitation of a single diffraction limit point on the sample and tracking the temporal evolution of subsequent carrier distribution, thus covering a very small sample area.

Recently, scientists from Italy and Spain have demonstrated how to construct an all optical phase-locked camera by using off-axis holography, significantly increasing the field of view of ultrafast microscopes. The camera decouples the signal demodulation speed from the maximum detector frame rate.

In this original work published in the journal Ultrafast Science, researchers demonstrated simultaneous transient imaging of dozens of individual nanoobjects, with the entire field of view excitation being desirable. It is not yet clear how to apply new holographic techniques in solid-state samples that require diffraction limit excitation. Ideally, a diffraction limited excitation point array covering the entire field of view will be generated, so that multiple points in the large sample area can be detected simultaneously.

The article "High sensitivity visualization of ultrafast carrier diffusion using a wide field holographic microscope" demonstrates how to achieve this feature by imaging a pinhole array at the sample position. This not only helps to obtain statistical information about sample photophysics, but also for uniform samples, the signals of all light spots can be averaged, greatly improving the signal-to-noise ratio.

Source: Laser Net

Связанные рекомендации

  • Guangfeng Technology releases the world's first versatile laser headlights

    On April 25th, 2024, the Beijing International Auto Show officially opened, and Guangfeng Technology released the world's first ALL-IN-ONE all-around laser headlights.This headlight is the first to integrate multiple functions such as high beam ADB headlights, color changing temperature headlights, fog lights, ground information display, car cinema, etc. into a small volume headlight module, achie...

    2024-04-29
    Посмотреть перевод

  • Pressure sensing using dual color laser absorption spectroscopy

    The research team led by Professor Gao Xiaoming and Professor Liu Kun of the Chinese Academy of Sciences Hefei Institute of Physical Sciences recently designed a concentration independent pressure sensing technology for high-temperature combustion diagnosis. This method is based on dual color laser absorption spectroscopy.The results of this study have been published in Optics Letters.Aircraft eng...

    2024-03-09
    Посмотреть перевод

  • The constantly developing world of all-weather laser satellite communication

    Using light beams for communication is not a new idea, even outside of Star Trek, Star Wars, and other similar fantasy stories. Scientist and science fiction writer Arthur Clark predicted that beam communication, at that time modern satellite communication was just a dream.In 1975, the magazine published an article about laser communication or laser communication equipment. The demonstrati...

    2023-12-01
    Посмотреть перевод

  • Ultra fast laser tracking the "ballistic" motion of electrons in graphene

    Figure 1. The setup of Hui Zhao and his team at the University of Kansas Ultra Fast Laser Laboratory.A team of researchers from the University of Kansas's ultrafast laser laboratory recently managed to capture real-time ballistic transmission of electrons in graphene, which could lead to faster, more powerful, and more energy-efficient electronic devices in the future.The motion of electrons is of...

    2024-01-09
    Посмотреть перевод

  • Sivers will develop laser arrays for artificial intelligence and deliver prototypes in 2024

    Sivers Optics, a subsidiary of Sivers Semiconductors, has signed a product development agreement with an undisclosed company.Starting from the initial contract worth $1.3 million, the prototype will be delivered in 2024, and it is expected that the agreement will grow rapidly in 2025 before transitioning to mass production. After entering full production, customers expect the annual chip productio...

    2024-03-18
    Посмотреть перевод