English

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

1145

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 Science Island team has made new progress in detecting atmospheric formaldehyde

Recently, Zhang Weijun, a research team of the Anguang Institute of the Chinese Academy of Sciences, Hefei Academy of Materials, made new progress in atmospheric formaldehyde detection, and the related achievements were published on the international TOP journal Sensors and Actors: B. Chemical under the title of "Portable highly sensitive laser absorption spectrum formaldehyde sensor based on comp...

2023-09-21
See translation
Relevant teams of the Chinese Academy of Sciences breakthrough the application difficulties of ultra compact gas laser system in special scenarios

Recently, Liang Xu's team from the Laser Center of Anguang Institute, Chinese Academy of Sciences, Hefei Institute of Materia Medica, conducted research on corona discharge fluid control and its application in the gas laser system, proposed an electric field flow field coupling analysis model suitable for multi pin corona discharge scenarios, and revealed the flow velocity distribution characteris...

2024-07-20
See translation
Scientists have conducted a series of studies on the mechanical properties and flame retardancy of laser formed Ti40 flame-retardant titanium alloy

Recently, Professor Huang Chunping's team from Nanchang University of Aeronautics and Astronautics conducted a series of studies on the mechanical and flame retardant properties of laser formed Ti40 flame retardant titanium alloy. The research team used typical Ti40 flame-retardant titanium alloy as the research object and prepared Ti40 flame-retardant titanium alloy using LSF technology. The micr...

2023-08-15
See translation
The Japanese research team has manufactured a vertical deep ultraviolet emitting semiconductor laser device based on AlGaN, which is expected to be applied in fields such as laser processing

Recently, a Japanese research team has developed a vertical deep ultraviolet emitting semiconductor laser device based on AlGaN, which is expected to be applied in laser processing, biotechnology, and medical fields.As is well known, ultraviolet (UV) is an electromagnetic wave with a wavelength range of 100 to 380nm. These wavelengths can be divided into three regions: UV-A (315-380 nm), UV-B (280...

2023-10-23
See translation
The femtosecond laser was used to manufacture a magnetically responsive "Janus Origami" robot, which realized the effective integration of various droplet manipulation functions

Recently, the reporter learned from the University of Science and Technology of China that Professor Hu Yanlei's team and his collaborators in the micro-nano Engineering Laboratory of the School of Engineering Science and Technology of the School have prepared a magnetic-responsive double-God origami robot that can be used for cross-scale droplet manipulation using femtosecond laser micro-nano man...

2023-09-12
See translation

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

The Science Island team has made new progress in detecting atmospheric formaldehyde

Relevant teams of the Chinese Academy of Sciences breakthrough the application difficulties of ultra compact gas laser system in special scenarios

Scientists have conducted a series of studies on the mechanical properties and flame retardancy of laser formed Ti40 flame-retardant titanium alloy

The Japanese research team has manufactured a vertical deep ultraviolet emitting semiconductor laser device based on AlGaN, which is expected to be applied in fields such as laser processing

The femtosecond laser was used to manufacture a magnetically responsive "Janus Origami" robot, which realized the effective integration of various droplet manipulation functions