Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Since the demonstration of amplified spontaneous emission and optical gain in systems composed of semiconductor nanocrystals (NCs) [1], these materials have attracted rising interest in the scientific community due to their unique opto-electronic properties. In particular, the tunable photoluminescent (PL) emission and, usually, high quantum yields are two of the main features promoting NCs as potential candidates for lasing applications. However the large rate of non-radiative recombination through Auger processes is one of the main drawbacks of these systems, still preventing their extensive use in widespread applications. In this quest to realize efficient NCs-based lasers, NCs have been implemented in a large variety of systems and cavities.
Ordered assemblies of NCs, also known as supraparticles (SPs) [2], have recently emerged in the scientific field for their collective properties which differs from those of the composing NCs. SPs have been shown shape-dependent modulation of their PL emission originating from whispering gallery modes (WGMs) [3], thus opening the doors to their use as lasing cavities. Here we report, for the first time, on WGM lasing from SPs composed of luminescent NCs. We observe the appearance of lasing peaks on top of the WGMs (Q~200), which then evolves into mode competition for higher pump pulse intensities. The WGM origin of the lasing is supported by coherence measurements, which show spatial coherence extending over the entire rim of the SPs. The SPs act in this case both as gain medium and lasing cavities.
[1] V.I. Klimov et al., Science, 2000, 290, 5490, pp. 314-317.
[2] de Nijs et al., Nat. Mat., 2015,14, pp 56-60
[3] Vanmaekelbergh et al., ACS Nano, 2015, 9 (4), pp. 3942–3950.
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