chanelink logo
CHANELINK
한국어

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

539
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

  • Magdalena Ridge expands the capacity of optical interferometers

    The Magdalena Ridge Observatory has purchased a second-generation off-axis beam compressor from Optical Surface, which will expand the functionality of the facility's optical interferometer.Interferometer is a research tool that combines two or more light sources to create interference patterns that can be measured and analyzed. In astronomy, interferometers combine the light collected by multiple...

    2024-01-05
    번역 보기

  • Solar cell laser processing deserves attention

    Laser processing is a relatively emerging non-contact processing method that utilizes the high energy of a beam of light to interact with materials and instantly vaporize or change their properties to achieve the expected manufacturing effect. It has gradually been promoted and applied in China in the past 20 years. Due to the different types, pulse widths, and wavelengths of laser generators, the...

    2023-10-31
    번역 보기

  • 150 kW Ultra High Power Laser Sensor Released

    Recently, MKS announced the launch of a brand new Ophir ® A 150 kW ultra-high power laser sensor designed specifically for measuring ultra-high power levels up to 150 kW. This sensor has excellent accuracy and reliability, suitable for industrial and defense fields.This water-cooled calorimeter has a working wavelength range of 900-1100 nm and can measure power from 10 kW to 150 kW. Its extremely ...

    2024-12-27
    번역 보기

  • Progress in the study of ultrafast electron dynamics using short light pulses

    When electrons move in molecules or semiconductors, their time scale is unimaginably short. The Swedish German team, including Dr. Jan Vogelsang from the University of Oldenburg, has made significant progress in these ultrafast processes: researchers are able to track the dynamics of electrons released on the surface of zinc oxide crystals using laser pulses with nanoscale spatial resolution and p...

    2024-01-08
    번역 보기

  • Important Discovery in Aluminum Alloy Laser Coaxial Fusion Additive Manufacturing

    Aluminum alloy has unique advantages such as lightweight, high strength, and excellent corrosion resistance, and is highly favored in the aerospace manufacturing field. Laser Coaxial Fusion Additive Manufacturing (LCWAM) adopts beam shaping technology, which uses wire as the deposition material to melt and stack layer by layer. Compared to traditional side axis wire feeding technology, laser coaxi...

    2024-04-29
    번역 보기