What is it about?
We report the broadband nonlinear optical (NLO) properties of CsPbBr3 perovskite films achieved from colloidal nanocrystals prepared following a room temperature and open atmosphere anti-solvent precipitation method. The NLO studies were performed on the films of nanocubes (NCs) and nanorods (NRs) using the Z-scan technique with 1 kHz femtosecond pulses at 600, 700, and 800 nm. Large two-photon absorption cross sections (∼105 GM) were retrieved by fitting the open-aperture Z-scan data. Strong third-order NLO susceptibility (∼10−10 esu) was observed in these films. At higher peak intensities a switching of sign (in both NCs and NRs) in the real and imaginary parts of the NLO susceptibility was observed from the studies on these CsPbBr3 nanocrystals.
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Why is it important?
CsPbBr3 nanocrystals find potential applications in various fields such as opto-electronics and photonics
Perspectives
the NLO properties of an ambient condition synthesized colloidal CsPbBr3 perovskite NCs and NRs were measured using the Z-scan technique with fs pulses. A notable change in the refractive index is observed; at higher intensities 7.3 × 1010W∕cm2, an increase in the refractive index with a saturated absorption is evident. Large 2PA cross sections are reported which are comparable to those reported recently. It is observed that CsPbBr3 NCs and NRs depict a size and thickness of dependent NLO properties with increasing saturation intensity at higher peak intensities.
Professor Venugopal Rao Soma
University of Hyderabad
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This page is a summary of: Broadband femtosecond nonlinear optical properties of CsPbBr_3 perovskite nanocrystals, Optics Letters, January 2018, Optical Society of America (OSA),
DOI: 10.1364/ol.43.000603.
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