chanelink logo
CHANELINK
한국어

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

755
2023-12-25 14:16:07
번역 보기

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

관련 추천

  • Sivers Semiconductors, an optoelectronic semiconductor company, splits off its photonics business and goes public independently

    Recently, Sivers Semiconductors, a leading supplier of integrated chips and photonics modules for communication and sensing solutions, announced a significant strategic initiative:It will divest its subsidiary Sivers Photonics Ltd, which has signed a non binding letter of intent (LOI) with byNordic Acquisition Corporation and plans to achieve independent listing through a merger. This move aims ...

    2024-08-26
    번역 보기

  • AMCM 8 laser M 8K metal 3D printing equipment is about to be launched, equipped with 8 lasers

    In October 2023, Germany's AMCM (EOS, a global technology leader in industrial grade additive manufacturing) announced the upcoming launch of the M 8K metal 3D printing equipment. The device will be equipped with 8 lasers, with a construction volume of 800 x 800 x 1200 millimeters, nearly four times the size of AMCM's previously launched M 4K metal 3D printing device on the market.ArianeGroup's ho...

    2023-10-19
    번역 보기

  • Pressure sensing using dual color laser absorption spectroscopy

    The research team led by Professor Gao Xiaoming and Professor Liu Kun of the Chinese Academy of Sciences Hefei Institute of Physical Sciences recently designed a concentration independent pressure sensing technology for high-temperature combustion diagnosis. This method is based on dual color laser absorption spectroscopy.The results of this study have been published in Optics Letters.Aircraft eng...

    2024-03-09
    번역 보기

  • Swiitol Launches E24 Pro: A Breakthrough in Laser Engraving Technology

    In order to completely change the world of laser engraving, Swiitol has launched the E24 Pro, a 24W integrated laser engraving machine with cutting-edge features and functions. The Swiitol E24 Pro showcases an innovative integrated structure laser engraving machine made of durable aluminum alloy. It is worth noting that the device can be used out of the box without installation, providing users wi...

    2023-11-23
    번역 보기

  • In depth understanding of the formation of condensation rings in laser spot welding - machine learning and molecular dynamics simulation

    Researchers from the Pacific Northwest National Laboratory and Johns Hopkins University have reported that machine learning and molecular dynamics simulations can help to gain a deeper understanding of the formation of condensation rings in laser spot welding. The related paper titled 'Machine learning and molecular dynamics simulations aided insights into conditioned ring formation in laser spot ...

    2024-12-21
    번역 보기