Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.186
Publication date: 23rd September 2021
Solution-processed lasers have emerged as versatile, light sources for a variety of low-cost applications. Among the various resonator-gain media combinations, vertical cavity surface emitting lasers (VCSELs) based on lead halide perovskite nanocrystals (LHP NCs) appear particular attractive as they combine the impressive optical amplification properties of the LHP NCs with facile fabrication of relatively high Q-factor microcavities (MCs) suitable for low threshold optical amplification and lasing with stable intensity and small beam divergence. Yet, there are currently limited reports on such systems in the literature.
Herein, we demonstrate the fabrication of monolithic, all-solution processed MCs based on green-emitting CsPbBr3 and red-emitting CsPbI3 NCs combined with polymeric distributed Bragg reflectors (DBRs) produced out of alternate layers of cellulose acetate (CA) and polyvinylcarbazole (PVK) materials. Steady state and time-resolved photoluminescence (PL) experiments along with angle dependent reflectivity and PL are implemented for the characterization of the MCs. The photonic structures exhibit high Q-factors exceeding ~100 allowing the continuous wave excitation of amplified spontaneous emission (ASE) with low threshold of the order of ~100 mW/cm2. The ASE onset is evidenced by the: (i) threshold-type behavior and spectral narrowing on the excitation variable PL, (ii) amplification of the output intensity by up to one order of magnitude in the vicinity of the cavity mode, (iii) quenching of the PL lifetime when the cavity resonance overlaps with the NC emission. The aforementioned results, demonstrate the high potential of LHP NC photonic structures for practical, scalable, low cost laser applications.
This work was financially supported by the Research and Innovation Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS" Program (Grant Agreement No. "INFRASTRUCTURES/1216/0004", Acronym "NANOSONICS"). M. Athanasiou acknowledges financial support by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 831690.
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