Abstract
Charge coupled devices utilising electron multiplication (EMCCDs) have been available commercially for almost a decade. Currently they are the image sensors of choice for a wide range of applications requiring ultra high sensitivity whilst maintaining high data rates. Even at low data rates, these can yield benefits for single photon imaging. This chapter reviews the technology behind the EMCCD that is particularly relevant for very low light applications. Characteristics of the EMCCD devices are discussed, including the detailed behaviour of the multiplication gain. The various noise sources are examined, including the noise introduced by the multiplication process and that originating from the generation of background signal. The conventional use of signal to noise as a figure of merit for an EMCCD device is reviewed and it is shown that this can mask the benefit of the EMCCD, especially when the background signals are low. Photon counting techniques have been found to improve performance under some circumstances and the different approaches employed to date are covered. Device structures for optimising the signal generation are discussed and show that devices capable of almost ideal sensitivity are a reality. Charge coupled devices utilising electron multiplication (EMCCDs) have been available commercially for almost a decade. Currently they are the image sensors of choice for a wide range of applications requiring ultra high sensitivity whilst maintaining high data rates. Even at low data rates, these can yield benefits for single photon imaging. This chapter reviews the technology behind the EMCCD that is particularly relevant for very low light applications. Characteristics of the EMCCD devices are discussed, including the detailed behaviour of the multiplication gain. The various noise sources are examined, including the noise introduced by the multiplication process and that originating from the generation of background signal. The conventional use of signal to noise as a figure of merit for an EMCCD device is reviewed and it is shown that this can mask the benefit of the EMCCD, especially when the background signals are low. Photon counting techniques have been found to improve performance under some circumstances and the different approaches employed to date are covered. Device structures for optimising the signal generation are discussed and show that devices capable of almost ideal sensitivity are a reality.
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Acknowledgements
The content of this chapter has benefited from the support of many people within the High Performance Imaging Solutions Group at e2v technologies. Special appreciation is due to David Burt for his valuable suggestions and enlightening discussions.
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Robbins, M.S. (2011). Electron-Multiplying Charge Coupled Devices – EMCCDs. In: Seitz, P., Theuwissen, A. (eds) Single-Photon Imaging. Springer Series in Optical Sciences, vol 160. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18443-7_6
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DOI: https://doi.org/10.1007/978-3-642-18443-7_6
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