chanelink logo
CHANELINK
English

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

1239
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

  • The 2023 International Quantum Photonics Conference attracted over 600 attendees from 16 countries and regions

    On November 25th, Jinhua welcomed the 2023 International Quantum Photon Conference, which will lead the future of technology. This grand event is jointly hosted by the Chinese Society of Optical Engineering and the Jinhua Municipal Government, with joint support from the University of Science and Technology of China, Zhejiang Normal University, and the PhotoniX journal. The conference, with the th...

    2023-11-27
    See translation

  • Pensievision Wins Luminate NY OPI Accelerator Competition

    New York Governor Kathy Hochul announced last week that Pensievision emerged as the winner of the eighth cohort of the Luminate NY Optics, Photonics, and Imaging (OPI) Startup Accelerator Competition. The San Diego, California-based company was honored as the “Company of the Year” at the Luminate NY 2025 Finals held in Rochester on October 22. The finals were part of SPIE Optifab, the annual confe...

    10-31
    See translation

  • Optoma Launches Environmentally Friendly Short Focus Laser 4K Ultra High Definition Home Entertainment and Gaming Projector

    Ranked first in the global and American projection technology fields with 4K UHD and DLP ® The brand Optoma has launched Optoma UHZ35ST, a 4K ultra high definition home entertainment and gaming projector that follows the popular UHD35STx with a short focus laser. With its external power supply and various functional upgrades, UHZ35ST provides higher reliability, portability, and energy e...

    2023-09-19
    See translation

  • New LiDAR can 'see' faces from hundreds of meters away

    At a distance of 325 meters, the human eye may only be able to distinguish between a person's head and body, making it difficult to discern any other differences. But a research team including Heriot Watt University in the UK and Massachusetts Institute of Technology in the US has developed a new type of LiDAR scanner that can perform detailed analysis of a person's face from such a distance and c...

    02-11
    See translation

  • Compact short pulse laser with an efficiency of up to 80%

    The research team from the University of Stuttgart and Stuttgart Instruments GmbH has published a groundbreaking research result in the journal Nature - a new compact ultra short pulse laser. This device achieves a significant improvement in efficiency while maintaining excellent precision, with its energy conversion efficiency reaching more than twice that of existing common devices. In addition,...

    11-12
    See translation