chanelink logo
CHANELINK
English

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

1248
2023-12-25 14:16:07
See translation

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

Related Recommendations

  • NUBURU will enter a new stage of diversified development

    Recently, NUBURU, a global developer of high-power and high brightness industrial blue light laser technology, announced the signing of a strategic commitment letter, officially launching a deep layout in the field of national defense and security. This transformation plan covers capital restructuring, technology mergers and acquisitions, and management team upgrades, marking a new stage of divers...

    02-26
    See translation

  • Laser printing on fallen leaves can produce sensors for medical and laboratory use

    The manufacturing of sensors through 3D printing combines speed, design freedom, and the possibility of using waste as a substrate. In the circular economy model, various results have been achieved, and typically discarded residues are used as low-cost resources. A research team in Brazil has proposed a highly creative solution that involves printing electrochemical sensors on fallen leaves. The t...

    2024-05-16
    See translation

  • Development, Share, and Industry Insights of the US Laser Processing Market in 2025

    The global laser processing market is expected to grow from $4.2 billion in 2023 to $7.73 billion in 2031, with a compound annual growth rate (CAGR) expected to reach 8.1% during this forecast period. According to DataM Intelligence Comprehensive Report has released its latest report on the "Laser Processing Market Size 2025," providing a detailed analysis of market trends, key growth drivers, c...

    11-13
    See translation

  • Innovative laser based rain enhancement project launched by UAEREP and DERC teams

    Recently, the UAE Rainfall Enhancement Scientific Research Program launched a groundbreaking project with Dr. Guillaume Matras and his team from the Directional Energy Research Center of the Institute of Technology Innovation, aiming to address the challenge of global water shortage through advanced technology. This collaboration marks an important milestone in the field of rainfall enhancement sc...

    2024-03-02
    See translation

  • Shanghai Optics and Machinery Institute has made progress in femtosecond fiber lasers based on twisted Sagnac interferometer mode locking

    Recently, the research team of the Aerospace Laser Technology and System Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, proposed a torsional Sagnac interferometer and applied it to the fiber laser system, realizing mode locking self starting and pulse shaping. The relevant research achievements were published in the Journal of Lightwave Technology u...

    2024-04-22
    See translation