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High Performance CathodoLuminescence Solution

The SPARC cathodoluminescence systems offer the ultimate resolution and reliability. An ultraflat, large parabolic mirror provides high spatial resolution as well as maximum photon yield. From the basic SPARC Compact system to the unique SPARC Plus system, all CL techniques are available in the UV, visible and IR range with unique options like Angle Resolved CL, Polarization CL. The SPARC systems are modular allowing fast exchange of optical components and integrating seamlessly with the scanning electron microscope.

OLYMPUS DIGITAL CAMERA

 

CathodoLuminescence Diagram

CathodoLuminescence Photon Signal

CL1

Geology example CL

CL PMT_1

CathodoLuminescence PMT

Photonic Crytal

Photonic Crystal

Unique Angle Resolved CL

Unique Angle Resolved CL

Cathodoluminescence is light generated by irradiation of a material with an electron beam.
The control of light at the nanoscale is becoming more and more important as a result of the increasing use of optoelectronic devices and materials. It also opens up technological opportunities, such as highly sensitive chemical sensing and identification, improving performance of photodetectors or light emitting devices, and increasing the efficiency of solar cells.
The characterization of optical properties at the nanoscale is a challenge due to the diffraction limit which is inherentin optical techniques. As a result, cathodoluminescence is an increasingly popular technology with a wide range of applications for the development and characterization of materials and systems.

High-performance cathodoluminescence
The SPARC cathodoluminescence system offers ultimate resolution and reliability. A large, ultraflat parabolic mirror is mounted on a high precision stage. All optics are free-space coupled, ensuring maximum photon yield. The system is modular and open, allowing for the addition of multiple
optical components and a wide range of detectors. The software makes it possible to add functionality. While the system is open and modular, DELMIC’s commitment to ease-of-use and high performance ensures that your system is turn-key ready.
The system is closely integrated with the scanning electron microscope. This is seen in both the hardware and the software. The mounting of the hardware is done on a vacuum port in such a way that it is minimally invasive for the SEM. It takes less than five minutes to bring the SEM from CL mode back to its full original configuration.

The SPARC opens up new avenues of research such as electron beam induced nanophotonics, but its sensitivity and ease of use also make it possible to breathe life into more`traditional’ applications of cathodoluminescence.
The SPARC offers users advanced understanding of semiconductor and optoelectronic devices. The high
collection efficiency even allows the investigation of poor emitters of light, such as silicon-based materials.
Cathodoluminescence gives an additional contrast mechanism for materials inspection, failure analysis, geology, and petrology applications. CL imaging is an ideal tool, because it is fast and it provides information, not easily available by other techniques.
For both the pharmaceutical as well as the life sciences industry, CL can be used to screen active pharmaceutical ingredients and offers spectral fingerprinting.

Modularity
The SPARC has an open design. Optical boxes that can easily be replaced enable you to extend and add features to the system as your research needs evolve.

Unsurpassed sensitivity
The mirror is made of a unique type of aluminium: its tiny grain size ensures maximum flatness of the mirror, enhancing reflectivity, decreasing measurement time and reducing artifacts.

Reproducibility
The mirror’s precision stage ensures proper alignment between experiments. This makes it possible to do reproducible and quantitatively comparable measurements between different samples.

Ease-of-use
The operating software is straightforward to use and allows for easy alignment, acquisition and analysis of the results. The software can control the electron beam to allow for acquisition of electron images and to properly trigger the optical acquisition. With no adjustments in your sample preparations, you can take advantage of the high spectral resolution and extra contrast provided by electron microscopy.

Spectral mode
When the SPARC system is used in spectral mode, the light from the mirror is focused on a grating, as part of a Czerny-Turner spectrograph. A silicon detector is connected to the spectrograph resulting in optimized detection over the range of 400-900 nm. By scanning the e-beam across the sample, a hyperspectral image is made.

Angular mode
The SPARC provides the unique option to acquire angle-resolved images. Instead of focusing the light signal on a grating, an image of the mirror is projected onto an imaging camera. This allows for the detection of the directionality of the emitted light; also known as momentum spectroscopy. In this mode a filter wheel is used to spectrally distinguish the different emission wavelengths.

FEATURES
High Spatial Resolution
Modular and User Specific Spectral Imaging
Angle Resolved CathodoLuminescence
Polarisation Mode
Camera and PMT CathodoLuminescence
APPLICATIONS

Geology

Cathodoluminescence imaging is particularly useful for providing mineralogical information. The color and intensity of the emitted light gives insight into processes as crystal growth, replacement, deformation, provenance, and defect structures and can be used to fingerprint minerals down to
the resolution of a scanning electron microscope.

Nano Photonics

The SPARC offers a very powerful method to study optical phenomena at the nanoscale and to understand how light couples to matter in a fundamental way. It is also a useful tool for improving the performance of optoelectronic devices, because the light-emission maps created with the technique reflect the local density of electromagnetic states, a quantity that determines how well light couples to matter and vice versa (1).
The SPARC enables the study of nanostructures with deep-subwavelength resolution. The electron beam is used to excite nanostructures and the cathodoluminescence detector is subsequently used to detect the generated light. The higher detection efficiency not only leads to better results, but also makes it possible to do a whole new type of nanophotonics research; angle resolved measurements.
With this new detection method, the direction in which the light is emitted from an excited structure can be mapped as a function of the excitation position.
(1) Electron beams set nanostructures aglow, Nature 493, 143 (10 January 2013) doi:10.1038/493143a

Spectral Mode

When the SPARC system is used in spectral mode, the light from the mirror is focused on a grating, as part of a Czerny-Turner spectrograph. A silicon detector is connected to the spectrograph resulting in optimized detection over the range of 400-900 nm. By scanning the e-beam across the sample,a hyperspectral image is made.

Angular Mode

The SPARC provides the unique option to acquire angleresolved images. Instead of focusing the light signal on a grating, an image of the mirror is projected onto an imaging camera. This allows for the detection of the directionality of the emitted light; also known as momentum spectroscopy. In this mode a filter wheel is used to spectrally distinguish the different emission wavelengths.

Cathodoluminescence color imaging

Adding a PMT to your setup allows to do easy and fast acquisition of photons and further reducing the measurement time to acquire CL colour images. By adding a monochromator this can be either done for all photons, or for individual wavelengths. This will also enhance the field of view.

Sample Size

25 x 46 cm

Resolution (Spectral)

0.2nm

Resolution (Angular)

< 10 mrad

Camera

sCMOS

Efficiency

87% collection efficiency from a Lambertian source

Spectral range

Modular <400nm to >900nm

CE certified

Yes

RoHS compliant

Yes