Complementary cathodoluminescence lifetime imaging configurations in a scanning electron microscope

Meuret S, Garcia MS, Coenen T, Kieft E, Zeijlemaker H, Latzel M, Christiansen S, Woo SY, Ra YH, Mi Z, Polman A (2019)

Publication Type: Journal article

Publication year: 2019


Book Volume: 197

Pages Range: 28-38

DOI: 10.1016/j.ultramic.2018.11.006


Cathodoluminescence (CL) spectroscopy provides a powerful way to characterize optical properties of materials with deep-subwavelength spatial resolution. While CL imaging to obtain optical spectra is a well-developed technology, imaging CL lifetimes with nanoscale resolution has only been explored in a few studies. In this paper we compare three different time-resolved CL techniques and compare their characteristics. Two configurations are based on the acquisition of CL decay traces using a pulsed electron beam that is generated either with an ultra-fast beam blanker, which is placed in the electron column, or by photoemission from a laser-driven electron cathode. The third configuration uses measurements of the autocorrelation function g (2) of the CL signal using either a continuous or a pulsed electron beam. The three techniques are compared in terms of complexity of implementation, spatial and temporal resolution, and measurement accuracy as a function of electron dose. A single sample of InGaN/GaN quantum wells is investigated to enable a direct comparison of lifetime measurement characteristics of the three techniques. The g (2) -based method provides decay measurements at the best spatial resolution, as it leaves the electron column configuration unaffected. The pulsed-beam methods provide better detail on the temporal excitation and decay dynamics. The ultra-fast blanker configuration delivers electron pulses as short as 30 ps at 5 keV and 250 ps at 30 keV. The repetition rate can be chosen arbitrarily up to 80 MHz and requires a conjugate plane geometry in the electron column that reduces the spatial resolution in our microscope. The photoemission configuration, pumped with 250 fs 257 nm pulses at a repetition rate from 10 kHz to 25 MHz, allows creation of electron pulses down to a few ps, with some loss in spatial resolution.

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How to cite


Meuret, S., Garcia, M.S., Coenen, T., Kieft, E., Zeijlemaker, H., Latzel, M.,... Polman, A. (2019). Complementary cathodoluminescence lifetime imaging configurations in a scanning electron microscope. Ultramicroscopy, 197, 28-38.


Meuret, Sophie, et al. "Complementary cathodoluminescence lifetime imaging configurations in a scanning electron microscope." Ultramicroscopy 197 (2019): 28-38.

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