Development of Cathodoluminescence (CL) for Semiconductor Research, Part I: TEM-CL Study of Microstructures and Defects in Semiconductor Epilayers

Yamamoto, Naoki

doi:10.1007/3-540-45850-6_4

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…TEM-CL uses an angstrom-size electron probe and provides CL spectra with both high energy and spatial resolution beyond the limits of conventional photoluminescence. [40] We used this capability to acquire CL data from individual, isolated core-shell fibers. STEM highangle annular dark field (HAADF) images were simultaneously acquired with CL data for reference.…”

Section: Characterizationmentioning

confidence: 99%

“…However, the CL result indicates that the blue emission from UCNPs is present and could likely induce red emission from the core by the proposed 'handshake' process. Since the penetration depth of TEM-CL is greater than 20 μm [40], it is safe to assume that the CL is from the entire illuminated volume of the fiber (i.e. the volume inside the green box in Fig.…”

Section: Tem Imaging and Cathodoluminescent Activitymentioning

confidence: 99%

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Nanoscale upconversion for oxygen sensing

Presley

Hwang

Cheong

et al. 2017

Materials Science and Engineering: C

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Optical oxygen sensors have many promising qualities but rely on excitation by violet or blue wavelengths that suffer from high levels of scattering and absorption in biological tissues. Here we demonstrate an alternative method using 980nm near-infrared light to initially stimulate ceramic upconverting nanoparticles (UCNPs) contained within a novel form, electrospun core-shell fibers. The emission of the UCNPs excites a molecular optical oxygen sensor, the subsequent phosphorescent emission being dynamically quenched by the presence of molecular oxygen. The potential for use of such an energy transfer within electrospun fibers widely used in biological applications is promising. However, current knowledge of such 'handshake' interactions is limited. Fiber-based carriers enabling such optical conversions provide unique opportunities for biosensing as they recapitulate the topography of the extracellular matrix. This creates a wide array of potential theranostic, fiber-based applications in disease diagnosis/imaging, drug delivery and monitoring of therapeutic response. Using a fiber-based vehicle, we observed gaseous oxygen sensing capabilities and a linear Stern-Volmer response allowing highly accurate calibration. Configurational aspects were also studied to determine how to maximize the efficiency of this 'handshake' interaction.

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Section: Characterizationmentioning

confidence: 99%

Section: Tem Imaging and Cathodoluminescent Activitymentioning

confidence: 99%

Nanoscale upconversion for oxygen sensing

Presley

Hwang

Cheong

et al. 2017

Materials Science and Engineering: C

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“…Conventionally CL imaging has been conducted with SEM, where the CL emission from specimens is collected through the parabolic mirror to generate a scanning image. Though CL images generated with TEM were once claimed (Yamamoto 2002;Strunk et al, 2006), what was actually done was a CL imaging with the scanning mode of STEM(STEM-CL). The type of CL imaging shown in this paper must be the first one ever reported.…”

Section: Introductionmentioning

confidence: 99%

Hybrid fluorescence and electron cryo-microscopy for simultaneous electron and photon imaging

Iijima

Fukuda

Arai³

et al. 2014

Journal of Structural Biology

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Integration of fluorescence light and transmission electron microscopy into the same device would represent an important advance in correlative microscopy, which traditionally involves two separate microscopes for imaging. To achieve such integration, the primary technical challenge that must be solved regards how to arrange two objective lenses used for light and electron microscopy in such a manner that they can properly focus on a single specimen. To address this issue, both lateral displacement of the specimen between two lenses and specimen rotation have been proposed. Such movement of the specimen allows sequential collection of two kinds of microscopic images of a single target, but prevents simultaneous imaging. This shortcoming has been made up by using a simple optical device, a reflection mirror. Here, we present an approach toward the versatile integration of fluorescence and electron microscopy for simultaneous imaging. The potential of simultaneous hybrid microscopy was demonstrated by fluorescence and electron sequential imaging of a fluorescent protein expressed in cells and cathodoluminescence imaging of fluorescent beads.

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Development of high-resolution cathodoluminescence system for STEM and application to plasmonic nanostructures

Yamamoto¹

2016

Microscopy (Tokyo)

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A high-resolution cathodoluminescence (CL) system for scanning transmission electron microscope (STEM) has been developed by employing a field emission gun and a spherical aberration corrector, which realizes a probe size of 1 nm even at an accelerating voltage of 80 kV and beam current of the order of 1 nA. Angle resolved measurement of light emission from a sample in the STEM is possible by combining a parabolic mirror and position-controlled pinhole. CL spectra are successively acquired by a highly sensitive charge-coupled device while scanning the incident electron beam or pinhole, which enables various detection modes, i.e. (i) angle resolved spectral pattern, (ii) beam scan spectral image and (iii) photon map. In order to calibrate the acquired spectrum, the correction function is created from the comparison between the observed and theoretical spectra of the transition radiation. Furthermore, the modification of polarization by the parabolic mirror is discussed. Some examples of the applications of the STEM-CL system to plasmonics are presented to demonstrate the unique measurement features of the CL system, i.e. (i) multipole modes in silver nanoparticles, (ii) surface plasmon polariton modes in a 2D plasmonic crystal and (iii) localized surface plasmon modes in a gold bow tie nano-antenna.

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Development of Cathodoluminescence (CL) for Semiconductor Research, Part I: TEM-CL Study of Microstructures and Defects in Semiconductor Epilayers

Cited by 3 publications

References 22 publications

Nanoscale upconversion for oxygen sensing

Nanoscale upconversion for oxygen sensing

Hybrid fluorescence and electron cryo-microscopy for simultaneous electron and photon imaging

Development of high-resolution cathodoluminescence system for STEM and application to plasmonic nanostructures

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