Nonlinear optical processes in short polyenes: Configuration interaction description of two‐photon absorption and third‐harmonic generation

1992 ◽  
Vol 97 (2) ◽  
pp. 1132-1137 ◽  
Author(s):  
Zhigang Shuai ◽  
D. Beljonne ◽  
J. L. Brédas
Keyword(s):  
Harmonic Generation ◽  
Configuration Interaction ◽  
Nonlinear Optical ◽  
Third Harmonic Generation ◽  
Photon Absorption ◽  
Third Harmonic ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Giant Third-Order Nonlinear Response of Mixed Perovskite Nanocrystals

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 389
Author(s):  
Aya M. Abu Baker ◽  
Ganjaboy S. Boltaev ◽  
Mazhar Iqbal ◽  
Mikhail Pylnev ◽  
Nasser M. Hamdan ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Laser Pulses ◽  
Photon Absorption ◽  
Third Order ◽  
Central Wavelength ◽  
Third Harmonic ◽  
Perovskite Nanocrystals ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The Third

Mixed (FAPbI3)0.92(MAPbBr3)0.08 perovskite thin films exhibit strong nonlinear optical responses, rendering them promising candidates for applications in photonics and optical communications. In this work, we present a systematic study on the ultrafast third-order nonlinear optical processes in mixed perovskite nanocrystals (NCs) by exploring the generation of third harmonic radiation and giant two-photon absorption-based photoluminescence (PL) when excited by femtosecond laser pulses of a 1030 nm central wavelength. A comparative analysis of the coherent third harmonic generation in the thin-film-containing perovskite nanocrystals has shown a 40× enhancement of the third harmonic signal compared to the signal generated in the pure quartz substrate. The cubic dependence of the third-nonlinear optical response of the (FAPbI3)0.92(MAPbBr3)0.08 perovskites on the intensity of the driving radiation was identified using broadband 38 femtosecond driving pulses. The positive nonlinear refractive index (γ = +1.4 × 10−12 cm2·W−1) is found to play an important role in improving the phase-matching conditions of the interacting pulses by generating a strong third order harmonic. The giant two-photon absorption (TPA)-assisted PL peak was monitored and a blue shift of the PL was obtained in the higher intensity range of the laser pulses, with the absorption coefficient β estimated to be~+7.0 cm·MW−1 at a 1030 nm laser wavelength.

A series of multifunctional coordination polymers based on terpyridine and zinc halide: second-harmonic generation and two-photon absorption properties and intracellular imaging

2017 ◽  
Vol 5 (27) ◽  
pp. 5458-5463 ◽  
Author(s):  
Jian Su ◽  
Jun Zhang ◽  
Xiaohe Tian ◽  
Meng Zhao ◽  
Tao Song ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Coordination Polymers ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Intracellular Imaging ◽  
Two Photon Absorption ◽  
Two Photon

Nonlinear optical CPs with good one- and two-photon excited fluorescence and SHG properties are presented.

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