English

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

145
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
  • China has successfully developed the world's first 193 nanometer compact solid-state laser

    The Chinese Academy of Sciences reduced the volume of the deep ultraviolet laser by 90% and achieved 193 nm vortex beam output for the first time. Professor Xuan Hongwen described "loading truck equipment into the car trunk". This technology enables a 30% reduction in the size of lithography features, breaking through the bottleneck of the 2-nanometer process. In the next three years, laser power ...

    03-24
    See translation
  • Rapid and convenient preparation of small-sized metal nanoparticles using microchip lasers

    Liquid pulse laser ablation is a reliable and versatile technique for producing metal nanoparticles in solution. Its advantages include no reducing agent, simple operation, high purity, no need for purification steps, and environmental processing conditions, making it the preferred method for traditional metal NP preparation.The widespread adoption of PLAL in scientific and industrial research has...

    2024-01-30
    See translation
  • Germany Developed Short Wave Green Laser Underwater Cutting Technology

    With the prominent energy issues in various countries around the world, the utilization and development of energy have become a hot topic, and the demand for renewable energy is constantly increasing. The existing underwater infrastructure is no longer sufficient and needs to be dismantled using appropriate modern technology. For example, in order to increase the power of offshore wind power plant...

    2023-09-18
    See translation
  • Based on Transform Optics: Realizing an Ideal Omnidirectional Invisible Cloak in Free Space

    A team led by Professor Ye Dexin and Professor Chen Hongsheng from Zhejiang University, as well as Professor Yu Luo from Nanyang University of Technology, conducted practical research on full parameter transformation optical devices. The research team has designed and implemented an all parameter omnidirectional invisibility cloak based on the theory of linear transformation optics and omnidirecti...

    2024-04-29
    See translation
  • Tsinghua University has made progress in the field of magnetic field and laser composite processing

    The National Key Laboratory of Interface Science and Technology for High end Equipment at Tsinghua University has made progress in the field of magnetic field and laser composite processing - magnetic field assisted laser shock strengthening of Ti6Al4V alloy. The relevant research was published as a cover article titled "Magnetic Field Assisted Laser Shock Peening of Ti6Al4V Alloy" in the journal ...

    2023-09-16
    See translation