chanelink logo
CHANELINK
Ελληνικά

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

232
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

  • Research has found that inorganic perovskite materials are easy to prepare and process, making them suitable for manufacturing lasers

    According to research from Busan National University, inorganic perovskite materials are easy to prepare and process, making them suitable for manufacturing lasers.The perovskite of interest is CsPbBr3, which must form "nanosheets" within the specific structure invented by the Busan team to obtain sufficient laser gain.It is not that the laser has been achieved, as the research project aims to cha...

    2024-01-04
    Δείτε τη μετάφραση

  • Researchers at the Massachusetts Institute of Technology have designed a new type of quantum light source using lead salt perovskite nanoparticles

    Most traditional quantum computing uses the spin of supercooled atoms or individual electrons as quantum bits, which form the foundation of such devices. By comparison, if light is used to replace physical entities as basic quantum bits, ordinary lenses and optical detectors can replace expensive devices to control the data input and output of quantum bits.Based on this, chemistry professors Moung...

    2023-10-09
    Δείτε τη μετάφραση

  • The researchers used ultrafast lasers to create nanoscale photonic crystals

    The optical properties of photonic crystals are closely related to their lattice constants, which are usually required to be in the same order of magnitude as the operating wavelength. In a crystal material, the photonic crystal structure is formed by the periodic arrangement in space of units whose dielectric constant is different from that of the crystal itself, and whose lattice constant depend...

    2023-08-04
    Δείτε τη μετάφραση

  • Ruifeng high power ultraviolet laser will become an indispensable tool in the production of thin film solar cells in the future

    With the rise of clean energy and the enhancement of environmental awareness, thin film solar cells are gradually replacing traditional silicon-based solar cells as an efficient energy conversion device.However, to achieve efficient solar cell conversion rates, the key is to ensure that thin film solar cells have clear edges and maximize light absorption. In this regard, the unique advantages of h...

    2023-09-08
    Δείτε τη μετάφραση

  • Export of Pentium Laser Automation Production Line to Japan

    Recently, several large trucks from the Wenzhou factory of Pentium Laser were lined up and ready to go. The high-power and high-speed laser cutting automation production line developed and produced by Pentium Laser has been strictly inspected and accepted by Japanese customers for 15 days and 24 hours of uninterrupted operation. Today, it was loaded and sent to Japan. This laser cutting automati...

    2024-12-06
    Δείτε τη μετάφραση