Transition from two-photon absorption to saturable absorption in gold patterned ruby thin film

Optik ◽  
2019 ◽  
Vol 182 ◽  
pp. 186-193
Author(s):  
Satchi Kumari ◽  
Shompa Kumari ◽  
Avesh Kumar ◽  
Vijay Kumar ◽  
R.P. Singh
Keyword(s):  
Thin Film ◽  
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.

Nondegenerate and degenerate two-photon absorption in cuprous oxide thin film

2019 ◽  
Vol 28 (02) ◽  
pp. 1950015 ◽  
Author(s):  
Huijun Liang ◽  
Qunchao Ma ◽  
Jian Liu ◽  
Xinwei Shi ◽  
Gongjin Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Cuprous Oxide ◽  
Near Infrared ◽  
Rf Magnetron Sputtering ◽  
Photonic Devices ◽  
Photon Absorption ◽  
Oxide Thin Film ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nir Absorption

A cuprous oxide (Cu2O) thin film was prepared by radio-frequency (RF) magnetron sputtering. The crystal structure, linear transmission spectrum and film thickness were characterized by X-ray diffraction (XRD), ultraviolet–visible–near infrared (UV–Vis–NIR) absorption spectroscopy and ellipsometry. By performing the pump-probe and [Formula: see text]-scan technique, respectively, nondegenerate and degenerate two-photon absorption (D-TPA) coefficients of the Cu2O thin film at several different excitation wavelengths were experimentally determined. The nondegenerate two-photon absorption (ND-TPA) coefficient always exhibits larger magnitude than the corresponding D-TPA coefficient. In particular, the ND-TPA coefficient shows a maximum value of [Formula: see text][Formula: see text]cm/GW. This study indicates that the cuprous oxide could be a potential material for ultrafast nonlinear photonic devices based on two-photon absorption due to its large ND-TPA coefficient.

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 Observation of three-photon absorption and saturation of two-photon absorption in amorphous nanolayered Se/As2S3 thin film structures

2007 ◽  
Vol 102 (2) ◽  
pp. 026102 ◽  
Author(s):  
K. V. Adarsh ◽  
K. S. Sangunni ◽  
C. S. Suchand Sandeep ◽  
Reji Philip ◽  
S. Kokenyesi ◽  
...  
Keyword(s):  
Thin Film ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

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.

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