chanelink logo
CHANELINK
Français

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

753
2023-12-25 14:16:07
Voir la traduction

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

Recommandations associées

  • Vast's Haven-1 program has become the world's first commercial space station equipped with SpaceX Starlink lasers

    Vast's Haven-1 program will become the world's first commercial space station, equipped with SpaceX's Starlink laser terminal, providing connections to its crew users, internal payload racks, external cameras, and instruments at speeds of gigabits per second and low latency.Max Haot, CEO of Vast, said: "If you need to provide high-speed, low latency, and continuous Internet connection on the orbit...

    2024-04-10
    Voir la traduction

  • ABB will add optical sensors to four greenhouse gas monitoring satellites

    ABB has signed a third contract with the global leader in high-resolution space greenhouse gas monitoring, GHGSat, to manufacture optical sensors for its C12, C13, C14, and C15 satellites. It is reported that C12, C13, C14, and C15 satellites are scheduled to be launched into orbit in 2024.These new satellites will join GHGSat's expanding constellation for detecting and quantifying industrial gas ...

    2023-12-06
    Voir la traduction

  • Southern Stoneworks revolutionizes countertop installation in Orlando with innovative laser technology

    A good countertop can make a home better. In that spirit, Southern Stoneworks, Orlando's leading countertop manufacturer and installer, has set a new standard in the industry by incorporating advanced laser technology into its processes. Utilizing state-of-the-art laser-guided saws and tools, the company has significantly reduced the time required to measure, manufacture, and install kitchen count...

    2023-08-04
    Voir la traduction

  • Laser giant seeks $100 million financing for $422 million debt restructuring

    On August 6th local time, Luminar, a leading publicly traded company in the field of LiDAR, announced a $422 million debt restructuring and raised $100 million in new capital. This measure marks Luminar taking solid steps in optimizing its capital structure and enhancing its financial stability.In early May this year, this laser radar manufacturer released an open letter disclosing a major strateg...

    2024-08-09
    Voir la traduction

  • Researchers are studying lasers for controlling magnetic ripple interactions

    One vision for computing the future is to use ripples in magnetic fields as the fundamental mechanism. In this application, magnetic oscillators can be comparable to electricity and serve as the foundation of electronic products.In traditional digital technology, this magnetic system is expected to be much faster than today's technology, from laptops and smartphones to telecommunications. In quant...

    2024-02-11
    Voir la traduction