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Transmission Electron Microscopy

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...

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Related Experiment Video

Updated: Dec 18, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Ghost spintronic THz-emitter-array microscope.

Si-Chao Chen^1,2, Zheng Feng³, Jiang Li^1,3

¹Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900 Sichuan China.

Light, Science & Applications

|June 19, 2020

Summary

This summary is machine-generated.

Researchers developed a new terahertz imaging technique using a reconfigurable spintronic terahertz emitter array (STEA) for efficient, nonscanning, deep subdiffraction imaging. This ghost spintronic THz-emitter-array microscope (GHOSTEAM) enables label-free bioimaging and material analysis.

Keywords:

Super-resolution microscopy Terahertz optics

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Last Updated: Dec 18, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Published on: September 14, 2018

Area of Science:

Physics
Optics
Materials Science

Background:

Terahertz (THz) waves offer potential for nondestructive testing, biodetection, and cancer imaging.
Current THz near-field imaging methods often rely on scanning, limiting efficiency and speed.
Achieving deep subdiffraction resolution in a nonscanning, noninvasive manner remains a significant challenge.

Purpose of the Study:

To demonstrate a novel THz near-field microscopy technique for efficient, nonscanning, deep subdiffraction imaging.
To introduce a reconfigurable spintronic THz emitter array (STEA) for advanced THz imaging applications.
To enable label-free bioimaging and material analysis with enhanced resolution and capabilities.

Main Methods:

Utilized a reconfigurable spintronic THz emitter array (STEA) based on the computational ghost imaging principle.
Reconstructed THz images by illuminating objects with the STEA and computing the correlation.
Implemented in-line polarization rotation via an external magnetic field for polarization-free fused image contrast.
Employed time-of-flight (TOF) measurements for depth-resolved imaging.

Main Results:

Achieved deep subdiffraction resolution in THz near-field imaging without scanning.
Demonstrated polarization-free fused image contrast by controlling THz wave polarization.
Successfully resolved objects at different depths using time-of-flight measurements.
Developed the ghost spintronic THz-emitter-array microscope (GHOSTEAM) as a novel imaging tool.

Conclusions:

The GHOSTEAM offers a radically novel approach to THz near-field imaging.
This technique opens paradigm-shifting opportunities for nonintrusive, label-free bioimaging.
The broadband frequency range (0.1–30 THz) makes it versatile for various scientific and industrial applications.