microscopes, both "cold" and "hot" cathode types. More recently, an angle-resolved cathodoluminescence microscopy system has been developed at the FOM Institute AMOLF. This is a super-resolution technique that can create images with a resolution of up to 10 nm. As of 2011, this technology has become commercially available. Local density of photonic states probed by CL Beyond the material composition, cathodoluminescence microscopy can be used to structures made of known materials, but with rich combinations of these. In this case, CL is capable of measuring the local density of states (LDOS) of a nanostructured photonic medium, where the intensity of the emitted CL reflects directly the number of available photonic states. This is very relevant for materials like photonic crystals or complex topologies for which large LDOS variations are achieved on nanometer scales. On the other hand, LDOS variations should be taken into account when analyzing standard CL maps. References Further reading Scientists shed light on glowing materials CL probes the photonic LDOS From the discovery of the electron to subwavelength microscopy: An introduction to cathodoluminescence DELMIC Microscopy Blog Glowing yellow calcite and green aragonite: Cathodoluminescence sheds light in geosciences DELMIC Microscopy Blog Microscopes Optical microscopy techniques