chanelink logo
CHANELINK
English

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

1263
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

  • STREAMLIGHT Upgrade TLR RM Light with Red or Green Laser

    Streamlight, a leading supplier of high-performance lighting and weapon lights/laser aiming equipment, has launched upgraded models of its TLR RM 1 and TLR RM 2 series of lights, each now equipped with an HPL face cap, providing ultra bright beams of up to 1000 lumens and an extended range of up to 22000 candela.The popular TLR RM 1 and TLR RM 2 models are equipped with red or green lasers, both o...

    2024-02-23
    See translation

  • Ecken develops a new type of iron silicon powder for 3D printing of motors

    Through the SOMA project funded by the European Union, organic silicon material expert Aiken has collaborated with research partners and clients to develop a new specialized iron silicon powder that can more efficiently 3D print motor components.Yesterday's electric motor was usually made by cutting and shaping parts from a metal plate. 3D printing can fundamentally improve efficiency and...

    2024-01-20
    See translation

  • San’an and Inari acquire Lumileds for $239 million

    San’an Optoelectronics, an LED chip manufacturer, based in China, and Inari Amertron Berhad, a Malaysian company that provides outsourced semiconductor assembly and test (“OSAT”) services to the semiconductor industry, are to acquire Lumileds Holding B.V. and its European and Asian subsidiaries (“Lumileds International”). Lumileds is based in Schiphol, The Netherlands.The all-cash deal is valued a...

    08-13
    See translation

  • Osram has received over 300 million euros in German investment to develop next-generation optoelectronic semiconductor technology

    Recently, ams Osram, a developer of smart sensors and transmitters, announced that it expects to receive over 300 million euros in funding from the German Federal Government and the Free State of Bavaria over the next five years.This funding is aimed at promoting Osram's development of the next generation optoelectronic semiconductor technology in Regensburg, Germany. The IPCEI funding in this bat...

    2023-09-25
    See translation

  • Diffractive optical elements: the behind the scenes hero of structured light laser technology

    In today's rapidly developing technological era, structured light laser technology has become an important tool in the fields of 3D measurement and image capture. The core of this technology lies in a magical device called Diffractive Optical Elements (DOE), which can precisely control and shape laser beams, creating various complex light patterns. But what exactly is DOE? How does it work? Let Ho...

    2024-04-10
    See translation