Directed Assembly of Quantum Dots Using Brush Block Copolymers for Well-Ordered Nonlinear Optical Nanocomposites

A simple and effective approach based on the liquid phase exfoliation (LPE) method has been put forward for synthesizing boron quantum dots (BQDs). By adjusting the interactions between bulk boron and various solvents, the average diameter of produced BQDs is about 7 nm. The nonlinear absorption (NLA) responses of as-prepared BQDs have been systematically studied at 515 nm and 1030 nm. Experimental results prove that BQDs possess broadband saturable absorption (SA) and good third-order nonlinear optical susceptibility, which are comparable to graphene. The fast relaxation time and slow relaxation time of BQDs at 515 nm and 1030 nm are about 0.394–5.34 ps and 4.45–115 ps, respectively. The significant ultrafast nonlinear optical properties can be used in optical devices. Here, we successfully demonstrate all-optical diode application based on BQDs/ReS2 tandem structure. The findings are essential for understanding the nonlinear optical properties in BQDs and open a new pathway for their applications in optical devices.

Download Full-text

Increase of Third-Order Nonlinear Optical Activity of PbS Quantum Dots in Zeolite Y by Increasing Cation Size

Journal of the American Chemical Society ◽

10.1021/ja211547s ◽

2012 ◽

Vol 134 (5) ◽

pp. 2539-2542 ◽

Cited By ~ 21

Author(s):

Hyun Sung Kim ◽

Kyung Byung Yoon

Keyword(s):

Quantum Dots ◽

Optical Activity ◽

Nonlinear Optical ◽

Zeolite Y ◽

Third Order ◽

Cation Size ◽

Pbs Quantum Dots

Download Full-text

Few-Particle Effects in Nonlinear Optical Spectra of Semiconductor Quantum Dots

MRS Proceedings ◽

10.1557/proc-571-241 ◽

1999 ◽

Vol 571 ◽

Author(s):

Ulrich Hohenesteri ◽

Fausto Rossi ◽

Elisa Molinari

Keyword(s):

Quantum Dots ◽

Density Matrix ◽

Nonlinear Optical ◽

Coherent Control ◽

Optical Spectra ◽

Carrier Dynamics ◽

Semiconductor Quantum Dots ◽

Nonequilibrium Carrier ◽

Optical Nonlinearities ◽

Matrix Approach

ABSTRACTWe present a density-matrix approach for the description of nonequilibrium carrier dynamics in optically excited semiconductor quantum dots, that explicitly accounts for exciton-exciton as well as exciton-carrier interactions. Within this framework, we analyze few-particle effects in the optical spectra and provide a consistent description of additional peaks appearing at high photoexcitation density. We discuss possible applications of such optical nonlinearities in future coherent-control experiments.

Download Full-text

Electronic properties and third-order optical nonlinearities in tetragonal chalcopyrite AgInS2, AgInS2/ZnS and cubic spinel AgIn5S8, AgIn5S8/ZnS quantum dots

Journal of Materials Chemistry C ◽

10.1039/c6tc03854a ◽

2017 ◽

Vol 5 (1) ◽

pp. 149-158 ◽

Cited By ~ 10

Author(s):

Bartłomiej Cichy ◽

Dominika Wawrzynczyk ◽

Marek Samoc ◽

Wiesław Stręk

Keyword(s):

Quantum Dots ◽

Optical Properties ◽

Electronic Properties ◽

Nonlinear Optical ◽

Nonlinear Optical Properties ◽

Optical Nonlinearities ◽

Third Order

Electronic as well as third-order nonlinear optical properties of chalcopyrite AgInS2 and non-stoichiometric spinel AgIn5S8 quantum dots compared with corresponding Zn2+ alloyed compounds are presented in this work.

Download Full-text