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arXiv · 2312.07800

Purcell enhanced emission and saturable absorption of cavity-coupled CsPbBr$_3$ quantum dots

Purbita Purkayastha·Shaun Gallagher·Yuxi Jiang·Chang-Min Lee·Gillian Shen·David Ginger·Edo Waks
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Abstract

Halide perovskite semiconductors have emerged as promising materials for the development of solution-processed, scalable, high performance optoelectronic devices such as light-emitting diodes (LEDs) as well as coherent single photon emitters. Their integration to nanophotonic cavities for radiative enhancement and strong nonlinearity is underexplored. In this work, we demonstrate cavity-enhanced emission and saturable absorption using colloidal CsPbBr$_3$ perovskite quantum dots coupled to a high-Q cavity mode of a circular Bragg grating structure designed to facilitate integration of solution-processed materials . We achieve an order of magnitude increase in brightness and 8-fold increase in the spontaneous emission rate for the cavity-coupled emitters. This result indicates the possibility of achieving transform-limited photon coherence for the halide perovskites at cryogenic temperatures. We also observe saturable absorption of the emitters through intensity-dependent cavity quality factor. These results pave the way towards achieving improved photon indistinguishability and strong optical nonlinearities for cavity coupled perovskite systems.

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Purbita Purkayastha, Shaun Gallagher, Yuxi Jiang, Chang-Min Lee, Gillian Shen, David Ginger, Edo Waks. 2023-12-12. Purcell enhanced emission and saturable absorption of cavity-coupled CsPbBr$_3$ quantum dots. https://arxiv.org/abs/2312.07800

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