chanelink logo
CHANELINK
Ελληνικά

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

163
2023-12-25 14:16:07
Δείτε τη μετάφραση

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

Σχετικές προτάσεις

  • New two-photon aggregation technology significantly reduces the cost of femtosecond laser 3D printing

    Scientists at Purdue University in the United States have developed a new type of two-photon polymerization technology. This technology cleverly combines two lasers and utilizes 3D printing technology to print complex high-resolution 3D structures while reducing femtosecond laser power by 50%. It helps to reduce the cost of high-resolution 3D printing technology, thereby further expanding its appl...

    2024-07-05
    Δείτε τη μετάφραση

  • Significant progress has been made in the research on the detection of microwave electric fields in the Rydberg area of Shanghai Institute of Optics and Technology

    Recently, the Aerospace Laser Technology and System Department of the Shanghai Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, and the East China Research Team of the Key Laboratory of Quantum Optics, Chinese Academy of Sciences, together with the research team of Professor Chen Liqing of East China Normal University, demonstrated a Rydberg microwave sensor with high sens...

    2024-05-08
    Δείτε τη μετάφραση

  • Beyond Limits: The Amazing Power of Water in Laser Development

    Water helps to generate ultra continuous white lasers with an extremely wide wavelength range.Researchers have made significant progress in creating ultra wideband white laser sources, which have a wide wavelength range from ultraviolet to far-infrared. These advanced lasers are used in various fields, including imaging, femtosecond chemistry, telecommunications, laser spectroscopy, sensing, and u...

    2024-02-26
    Δείτε τη μετάφραση

  • MKS Instruments will build a factory in Malaysia

    Recently, American semiconductor equipment manufacturer MKS Instruments announced plans to build a factory in Penang, Malaysia to support the production of wafer manufacturing equipment in the region and globally. This development plan will be divided into three stages to build a new factory, and it is expected to break ground and start construction in early 2025.Why choose to build a factory in M...

    2024-06-26
    Δείτε τη μετάφραση

  • Feasibility Study on Composite Manufacturing of Laser Powder Bed Melting and Cold Casting

    It is reported that researchers from the Technical University of Munich in Germany have reported a feasibility study on the composite manufacturing of EN AC-42000 alloy by combining laser powder bed melting and cold casting. The related research titled "Feasibility study on hybrid manufacturing combining laser based powder bed fusion and chill casting on the example of EN AC-42000 alloy" was publi...

    2024-06-06
    Δείτε τη μετάφραση