Simple Yet Effective Method to Determine Multiphoton
Absorption Cross Section of Colloidal Semiconductor Nanocrystals
Posted on 2020-06-15 - 21:43
Colloidal semiconductor nanocrystals
(NCs) are on the vanguard
of nonlinear optical materials due to their superb optical properties
including tunable multiphoton absorption (MPA) with large absorption
cross sections. So far, investigating MPA of NCs has been regarded
as a difficult task, mostly constrained by the lack of measurement
techniques with high precision and consistency. Here, an alternative
method to measure the MPA cross section of luminescent NCs is presented.
The new method, referred to as multiphoton absorption photoluminescence
saturation (MPAPS), does not depend on any specific property of an
NC sample, allowing for a precise comparative study of NC samples
either holding different structures (e.g., core-only or core–shell
heterostructure) or exhibiting slow multicarrier dynamics (e.g., engineered
NCs for reduced Auger rates).
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Alo, Arthur; Barros, Leonardo W. T.; Nagamine, Gabriel; Vieira, Lucas B.; Chang, Jun Hyuk; Jeong, Byeong Guk; et al. (2020). Simple Yet Effective Method to Determine Multiphoton
Absorption Cross Section of Colloidal Semiconductor Nanocrystals. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.0c00505