scholarly journals Two-photon absorption and saturable absorption of mid-IR in graphene

2019 ◽  
Vol 114 (9) ◽  
pp. 091111 ◽  
Author(s):  
Andrew Malouf ◽  
Ori Henderson-Sapir ◽  
Sze Set ◽  
Shinji Yamashita ◽  
David J. Ottaway
Keyword(s):  
Photon Absorption ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon

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.

Coexistence of two-photon absorption and saturable absorption in ion-implanted platinum nanoparticles in silica plates

2018 ◽  
Vol 35 (6) ◽  
pp. 1295 ◽  
Author(s):  
C. Torres-Torres ◽  
J. Bornacelli ◽  
B. Can-Uc ◽  
H. G. Silva-Pereyra ◽  
L. Rodríguez-Fernández ◽  
...  
Keyword(s):  
Platinum Nanoparticles ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Ion Implanted

Nonlinear optical interactions of Co: ZnO nanoparticles in continuous and pulsed mode of operations

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80756-80765 ◽  
Author(s):  
Rajeswari Ponnusamy ◽  
Dhanuskodi Sivasubramanian ◽  
P. Sreekanth ◽  
Vinitha Gandhiraj ◽  
Reji Philip ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Zno Nanoparticles ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Thermal Lensing ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Pulsed Mode ◽  
Limiting Behaviour

Thermal lensing and two photon absorption with saturable absorption based optical limiting behaviour in Co: ZnO nanoparticles under CW and pulsed Nd: YAG laser irradiation.

Z-scan analytical theory for material with saturable absorption and two-photon absorption

2010 ◽  
Vol 283 (18) ◽  
pp. 3525-3528 ◽  
Author(s):  
Jin Wang ◽  
Bing Gu ◽  
Hui-Tian Wang ◽  
Xiao-Wu Ni
Keyword(s):  
Analytical Theory ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon

Defect-assisted saturable absorption characteristics in Mn doped ZnO nano-rods

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 88767-88772 ◽  
Author(s):  
Avanendra Singh ◽  
Samir Kumar ◽  
Ritwick Das ◽  
Pratap K. Sahoo
Keyword(s):  
Doping Level ◽  
Zno Nanorods ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nano Rods ◽  
Doped Zno ◽  
Mn Doped ◽  
Absorption Characteristics

After reaching a threshold doping level of Mn, it is possible to alter from two photon absorption to saturable absorption in ZnO nanorods.

Two-Photon Absorption in Polybenzidine

1994 ◽  
Vol 374 ◽  
Author(s):  
F. J. Aranda ◽  
C. F. Cheng ◽  
D. V. G. L. N. Rao ◽  
J. A. Akkara ◽  
D. L. Kaplan ◽  
...  
Keyword(s):  
Slow Component ◽  
Photon Absorption ◽  
Polymerization Reaction ◽  
Imaginary Component ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Nonlinear Optical Susceptibility ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nanosecond Pulses

AbstractPolymers of Benzidine were synthesized by hydrogen peroxide reaction catalyzed by horseradish peroxidase enzyme. The polymerization reaction was carried out at room temperature in a monophasic organic solvent with a small amount of water at pH 7.5.The technique of degenerate four-wave mixing (DFWM) with nanosecond and picosecond pulses was employed to measure the third-order nonlinear optical susceptibility χ. The samples were studied in solution in Dimethyl sulfoxide:Methanol in volume ratio 4:1. The observed values are of order 10−9 to 10−8esu. Measurements on a thin film agree approximately with the extrapolated values fron solution measurements. Picosecond time resolved measurements indicate a pulse-width limited response followed by a small slow component. Investigation of the total energy transmission as a function of the incident intensity and fluence at 532 nm for pico- and nanosecond pulses indicates reverse saturable absorption. As we observe the nanosecond and picosecond curves to be superimposed for the intensity plot but not for fluence, we conclude that the nonlinearity is predominantly due to two-photon absorption. Numerical analysis of the data yields a value of 12.25 cm/GW for the two-photon absorption coefficient β. The imaginary component of χ obtained is 5 × 10−9esu. The material appears to be a good candidate for applications in optical power limiting and switching.

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.

Energy transfer coupling of two-photon absorption and reverse saturable absorption for enhanced optical power limiting

1998 ◽  
Vol 23 (22) ◽  
pp. 1742 ◽  
Author(s):  
Mukesh P. Joshi ◽  
J. Swiatkiewicz ◽  
Faming Xu ◽  
Paras N. Prasad ◽  
B. A. Reinhardt ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Optical Power ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Optical Power Limiting

PHOTOINDUCED LASER EFFECTS IN INDIUM NITRIDE FILM

2011 ◽  
Vol 25 (03) ◽  
pp. 185-192 ◽  
Author(s):  
Z. P. WANG ◽  
C. M. GU ◽  
W. Z. SHEN
Keyword(s):  
Indium Nitride ◽  
Picosecond Laser ◽  
Excitation Intensity ◽  
Photon Absorption ◽  
Nitride Film ◽  
Saturable Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Transition

The optical nonlinear absorption properties in sputtering Indium nitride ( InN ) film were investigated under the excitations of nanosecond, picosecond and femtosecond pulsed lasers by open-aperture transmission Z-scan technique (TZ-scan). Under the condition of hν > Eg, the saturable absorption (SA) phenomena induced by one-photon transition were observed in both nanosecond and picosencond pulsed TZ-scan measurements. When 2hν > Eg > hν, the film presented SA due to the two-photon transition under the excitation of picosecond laser. However, at femtosecond 800 nm, the film showed the two-photon absorption (TPA) instead of SA, and the TPA coefficient tended to a saturable value as the excitation intensity increased. The results indicate that the InN film is a kind of good saturable absorber.

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