A high-speed area detector for novel imaging techniques in a scanning transmission electron microscope

Caswell, Thomas A; Ercius, Peter; Täte, Mark W.; Ercan, Ali; Grüner, Sol M.; Muller, David A.

doi:10.1016/j.ultramic.2008.11.023

Cited by 29 publications

(23 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, parallel data acquisition would allow for minimizing drift between acquisitions that makes locating the same area difficult in the absence of discernable features such as edges, and to avoid the beam damage caused by multiple exposures. To that end, the development and implementation of segmented 13 26 27 28 or pixelated HAADF detectors 29 30 is paramount and will make it easier to implement VA-HAADF for any number of detectors and angular ranges. It is important, however, that these new generation of detectors have response characteristics that meets the requirements for quantitative HAADF-STEM 31 .…”

Section: Discussionmentioning

confidence: 99%

Variable-angle high-angle annular dark-field imaging: application to three-dimensional dopant atom profiling

Zhang

Hwang

Isaac

et al. 2015

Sci Rep

View full text Add to dashboard Cite

Variable-angle high-angle annular dark-field (HAADF) imaging in scanning transmission electron microscopy is developed for precise and accurate determination of three-dimensional (3D) dopant atom configurations. Gd-doped SrTiO3 films containing Sr columns containing zero, one, or two Gd dopant atoms are imaged in HAADF mode using two different collection angles. Variable-angle HAADF significantly increases both the precision and accuracy of 3D dopant profiling. Using image simulations, it is shown that the combined information from the two detectors reduces the uncertainty in the dopant depth position measurement and can uniquely identify certain atomic configurations that are indistinguishable with a single detector setting. Additional advances and applications are discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Variable-angle high-angle annular dark-field imaging: application to three-dimensional dopant atom profiling

Zhang

Hwang

Isaac

et al. 2015

Sci Rep

View full text Add to dashboard Cite

show abstract

“…As discussed in the previous sections Medipix2 (and similar hybrid detectors) have a number of attractive properties, including a high DQE, even at very low-dose rates, a noiseless readout and high dynamic range which make them attractive for many experiments (Faruqi & Cattermole, 2005; Typke et al 2007; Caswell et al 2009; van Gastel et al 2009; Glaeser et al 2011). These properties are extremely useful, for example, if an image is to be collected by summing a number of shorter exposure images; since the readout is essentially noiseless the summation adds only the signal without adding extra noise from each image.…”

Section: Detectorsmentioning

confidence: 99%

Electronic detectors for electron microscopy

Faruqi

McMullan

2011

Quart. Rev. Biophys.

104

View full text Add to dashboard Cite

Electron microscopy (EM) is an important tool for high-resolution structure determination in applications ranging from condensed matter to biology. Electronic detectors are now used in most applications in EM as they offer convenience and immediate feedback that is not possible with film or image plates. The earliest forms of electronic detector used routinely in transmission electron microscopy (TEM) were charge coupled devices (CCDs) and for many applications these remain perfectly adequate. There are however applications, such as the study of radiation-sensitive biological samples, where film is still used and improved detectors would be of great value. The emphasis in this review is therefore on detectors for use in such applications. Two of the most promising candidates for improved detection are: monolithic active pixel sensors (MAPS) and hybrid pixel detectors (of which Medipix2 was chosen for this study). From the studies described in this review, a back-thinned MAPS detector appears well suited to replace film in for the study of radiation-sensitive samples at 300 keV, while Medipix2 is suited to use at lower energies and especially in situations with very low count rates. The performance of a detector depends on the energy of electrons to be recorded, which in turn is dependent on the application it is being used for; results are described for a wide range of electron energies ranging from 40 to 300 keV. The basic properties of detectors are discussed in terms of their modulation transfer function (MTF) and detective quantum efficiency (DQE) as a function of spatial frequency.

show abstract

“…First, the lattice orientations of the adjoining grains are measured through orientation imaging microscopy either in the scanning (Schwartz et al, 2009) or the transmission mode (Trimby, 2012;Caswell et al, 2009). The misorientation matrix M is then computed and AE is determined by the least positive integer such that AEM is an integral matrix.…”

mentioning

confidence: 99%