scholarly journals Photothermally Activated Two-Photon Absorption in Ion-Implanted Silicon Quantum Dots in Silica Plates

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
C. Torres-Torres ◽  
J. Bornacelli ◽  
R. Rangel-Rojo ◽  
J. A. García-Merino ◽  
B. Can-Uc ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ultrashort Pulses ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Silicon Quantum Dots ◽  
Two Photon Absorption ◽  
Two Photon ◽  
All Optical ◽  
Potential Applications ◽  
Silicon Based

The third-order nonlinear infrared and ultraviolet properties exhibited by silicon quantum dots irradiated by ultrashort pulses were studied. The samples were prepared by 1.5 MeV Si+2ion implantation processes in high-purity silica substrates. Femtosecondz-scan measurements conducted at 830 nm wavelength revealed strong self-focusing effects together with two-photon absorption that can be switched to saturable absorption as a function of the input irradiance. Changes in the main physical mechanism responsible for the picosecond absorptive nonlinearity in the sample were also observed at 355 nm, made possible by the assistance of photothermal phenomena. Ultraviolet self-diffraction explorations allowed us to estimate the Kerr effect of the nanostructures. Potential applications for developing all-optical filtering functions performed by silicon-based nanosystems can be considered.

scholarly journals Nonlinear Absorption and Ultrafast Dynamics of Ag Nanoparticle

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 233
Author(s):  
Jijuan Jiang ◽  
Jun Wang ◽  
Tong Wu ◽  
Yachen Gao
Keyword(s):  
Silver Nanoparticles ◽  
Time Constant ◽  
Laser Intensity ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Phonon Coupling ◽  
Saturated Absorption ◽  
Coupling Process ◽  
Two Photon Absorption ◽  
Two Photon

Resonant nonlinear optical absorption of silver nanoparticles was studied experimentally via open aperture Z-scan using 130 fs, 400 nm laser pulses. Experimental results show that, at low laser intensity, silver nanoparticles can exhibit saturated absorption. While at high laser intensity, it shows reverse saturated absorption. The saturable absorption is explained in terms of ground state plasmon bleaching, while the reverse saturable absorption is believed to be from two-photon absorption. Saturable optical intensity and two-photon absorption coefficient were obtained to be 1.3×1010 W/m2 and 3.3×10−10 m/W, respectively. The energy relaxation process of Ag nanoparticles after laser excitation was studied via pump-probe technique at 400 nm. Experimental results demonstrated that energy relaxation included electron-phonon coupling process with time constant τ1=(713±50) fs, and phonon-phonon coupling process with time constant τ2=(25.2±3) ps, respectively.

Ultra-sensitive all-optical sampling at 1.5 [micro sign]m using waveguide two-photon absorption

1999 ◽  
Vol 35 (17) ◽  
pp. 1483 ◽  
Author(s):  
B.C. Thomsen ◽  
L.P. Barry ◽  
J.M. Dudley ◽  
J.D. Harvey
Keyword(s):  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Sampling ◽  
All Optical

Optimization of Band Structure and Quantum-Size-Effect Tuning for Two-Photon Absorption Enhancement in Quantum Dots

Nano Letters ◽  
2011 ◽  
Vol 11 (3) ◽  
pp. 1227-1231 ◽  
Author(s):  
Lazaro A. Padilha ◽  
Gero Nootz ◽  
Peter D. Olszak ◽  
Scott Webster ◽  
David J. Hagan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Band Structure ◽  
Size Effect ◽  
Quantum Size Effect ◽  
Photon Absorption ◽  
Absorption Enhancement ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Quantum Size

Two-photon Absorption in ZnO/ZnS Core-shell Quantum Dots

2015 ◽  
Vol 36 (2) ◽  
pp. 249-255
Author(s):  
刘姝妤 LIU Shu-yu ◽  
钟绵增 ZHONG Mian-zeng ◽  
孟秀清 MENG Xiu-qing ◽  
李京波 LI Jing-bo ◽  
王沅倩 WANG Yuan-qian ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photon Absorption ◽  
Core Shell ◽  
Two Photon Absorption ◽  
Two Photon
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