---
title: "Cathodoluminescence g(2) imaging: technical note on the SPARC new imaging mode"
description: Read the new technical note on cathodoluminescence g(2) imaging, a time-resolved technique that Delmic is going to present for the first time during the IMC19 in September.
image: https://blog.delmic.com/hubfs/Lab%20Cube%20time-resolved%20CL.jpg
---

###### [cathodoluminescence](https://blog.delmic.com/news/topic/cathodoluminescence), [SPARC](https://blog.delmic.com/news/topic/sparc), [nanophotonics](https://blog.delmic.com/news/topic/nanophotonics) • 1

# Cathodoluminescence g(2) imaging: technical note on the SPARC new imaging mode

[Delmic September 6, 2018](https://blog.delmic.com/news/author/delmic)

![Product_sheetg2-01](https://blog.delmic.com/hs-fs/hubfs/Lab%20Cube%20time-resolved%20CL.jpg?width=1080&name=Lab%20Cube%20time-resolved%20CL.jpg)

In our recent post, we announced that Delmic will present the new imaging modes of the SPARC system during the IMC19: time-resolved cathodoluminescence imaging (g(2) and lifetime mapping).

Our last technical note focused on the [lifetime mapping](https://request.delmic.com/sparc-technical-note-lifetime-cathodoluminescence-mapping), and today we prepared another technical note, which focuses on the cathodoluminescence g(2) imaging.

The g(2) function (also known as second order autocorrelation function) is a very useful tool to observe how the light is distributed in time. It essentially describes the probability of seeing more than one photon at the same time and can be used to identify and characterize single-photon emitters at the nanoscale. The g(2) imaging can be detected with the [SPARC](https://www.delmic.com/sparc-cathodoluminescence-sem) LAB Cube, a [time-resolved](https://blog.delmic.com/time-resolved-cathodoluminescence-video-sparc) detector unit, which contains appropriate coupling optics, a beam splitter, two SPDs, and neutral density/color filters for control of the intensity and studied wavelength band. The LAB Cube is coupled with the SPARC spectral system, which allows to switch between g(2) detection and other various imaging modes, such as [lifetime](https://request.delmic.com/sparc-technical-note-lifetime-cathodoluminescence-mapping), [hyperspectral](https://request.delmic.com/hyperspectral-cathodoluminescence-imaging-technical-note-delmic), and [angle-resolved CL imaging](https://request.delmic.com/angle-resolved-cathodoluminescence-imaging-technical-note). 

To read more about the g(2) imaging and its possibilities for different applications, please [download the technical note](https://request-delmic-com.sandbox.hs-sites.com/en/cathodoluminescence-g2-imaging-technical-note).

#### Delmic

[![](https://blog.delmic.com/hs-fs/hubfs/2022_Delmic_M%26M%20Meeting%20Promo_Website.png?width=380&name=2022_Delmic_M%26M%20Meeting%20Promo_Website.png) ](https://blog.delmic.com/news/join-delmic-at-microscopy-microanalysis-mm-meeting-2022) [###### cathodoluminescence

## Join Delmic at Microscopy & MicroAnalysis (M&M) Meeting 2022

It’s official, Delmic is going to M&M 2022 in Portland, Oregon! You’ll find us at the biggest microscopy event of the year. We’ll be presenting our METEOR, ...

](https://blog.delmic.com/news/join-delmic-at-microscopy-microanalysis-mm-meeting-2022)

[![](https://blog.delmic.com/hs-fs/hubfs/Website/News/2022_CL_OTP%20Funding_Website.png?width=380&name=2022_CL_OTP%20Funding_Website.png) ](https://blog.delmic.com/news/open-technology-programme-funding) [###### cathodoluminescence

## Open Technology Programme (OTP) funding

We are delighted to announce that Delmic - CL Solutions is a part of the Open Technology Programme, granted by NWO. The project will look into a new ...

](https://blog.delmic.com/news/open-technology-programme-funding)

[![](https://blog.delmic.com/hs-fs/hubfs/Website/News/2022_CL_NWO%20Funding_Website.png?width=380&name=2022_CL_NWO%20Funding_Website.png) ](https://blog.delmic.com/news/nwo-funding-for-perovskite-solar-foil-consortium) [###### cathodoluminescence

## NWO funding for perovskite solar foil consortium

We are excited to announce that Delmic - CL Solutions will be part of the PerFoRM (Perovskite Foils by Roll-to-roll Manufacturing) consortium, funded by NWO's ...

](https://blog.delmic.com/news/nwo-funding-for-perovskite-solar-foil-consortium)