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The Gatan Monarc pushes the boundaries of what’s possible with a SEM-based cathodoluminescence system. It’s a next generation instrument with a boost in sensitivity and spectral resolution.


Highly sensitive

With unmatched spatial, angular and wavelength resolution.

Most complete CL analysis to date

Unique wavelength- and angle-resolved capabilities

Capture data simultaneously

400x larger field of view

Compared to other CL detectors


  • Unmatched spatial (<10 nm), angular (1°) and wavelength (0.1 nm) resolution
  • Capture angle- and wavelength-resolved CL data simultaneously
  • Collect hyper-spectral data up to 30 times faster than other CL detectors

Easy to Use

  • Automated alignment and recipes for the best results
  • Permanently aligned optics for reproducibility
  • Large field of view to increase productivity

Accurate Correlation

  • Detect multiple signals simultaneously
  • Correlated imaging of physical properties and composition with CL data
  • Full use in-lens SEM detectors during CL measurements

Unique Capabilities

Angle-Resolved (ARCL)

  • Study how light and matter interact far below the optical diffraction limit.
  • 400x larger field of view than other CL detectors with very similar resolution (patent pending)

Wavelength- and Angle-Resolved (WARCL)

  • Examine how light and matter interact at multiple viewing angles and wavelengths – more info…
  • Achieve previously impossible visualisations and studies, due to Monarc’s unique optical design

Polarisation Filtering

Determine the emission polarisation properties of deep sub-wavelength structures, such as:

  • Ooptical nanoantenna
  • Nano-cavities
  • Photonic crystals

 More about the new modes



For geoscience and mapping applications

The Monarc surpasses previous SEM CL detectors with the largest field of view, independent of spectral resolution. Hyperspectral data is collected with greater spatial sampling, using new wavelength-filtered spectrum imaging technology.

Monarc Pro

For nanophotonic and optoelectronic material applications

This model delivers the greatest sensitivity and spectral resolution of any CL system available. You’ll also benefit from unique wavelength- and angle-resolved analysis and polarisation-filtering options.


  • Nanophotonics
  • Optoelectronics
  • MicroLEDs and micropillars – more info…
  • Geosciences – more info…
  • LED & laser failure analysis
  • Light-matter interactions
  • Photovoltaic material characterisation
  • Phosphor technology



We offer a range of instruments for elemental and mineral analysis, mapping and imaging in geology and geoscience.


What is Cathodoluminescence? Plus how to add it to your SEM/TEM/STEM

Cathodoluminescence (CL) is a technique for characterising composition, optical and electronic properties with data that correlates with morphology, micro-structure, composition and chemistry at the nanoscale.

All About Cathodoluminescence – A New Website from Gatan: WhatisCL.info

Find out all about CL with Gatan's new website for users and for those new to the technique.

Using SEM-based Cathodoluminescence to Study Light Emission at Nanoscale Spatial Resolution

How cathodoluminescence can be used to study the emission patterns of nitride semiconductor micropillars for microLEDs in displays, including wearable devices.

Studying Crystal Orientation in Geology with Cathodoluminescence Polarisation-Filtered Spectrum Imaging

Cathodoluminescence can be used to study crystal structure orientation - in this example we look at how it can be used on a geological sample.

Analysing Ultra-Wide Bandgap (UWBG) Semiconductors with Cathodoluminescence (CL)

Map defect distribution and variations for process development of materials for electronic / optoelectronic devices. CL is ideal for materials not suitable for photoluminescence spectroscopy.

SEM-Based Cathodoluminescence in Geology and Geoscience

It's now much easier to achieve high quality results with SEM-based cathodoluminescence, with the new Gatan Monarc. This has valuable applications in geology and geoscience, for rocks and minerals analysis.

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