Sensitive measurement of nonlinear refraction and two-photon absorption by spectrally resolved two-beam coupling

1997 ◽  
Vol 22 (14) ◽  
pp. 1077 ◽  
Author(s):  
Inuk Kang ◽  
Todd Krauss ◽  
Frank Wise
Keyword(s):  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Beam Coupling ◽  
Spectrally Resolved

Two-Photon Absorption, Nonlinear Refraction and Optical Limiting in Semiconductors

2008 ◽  
pp. 404-404-20 ◽  
Author(s):  
EW Van Stryland ◽  
H Vanherzeele ◽  
MA Woodall ◽  
MJ Soileau ◽  
AL Smirl ◽  
...  
Keyword(s):  
Nonlinear Refraction ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Nonlinear Optical Pigments. Two-Photon Absorption in Crosslinked Conjugated Polymers and Prospects for Remote Nonlinear Optical Thermometry

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1670
Author(s):  
Jan K. Zaręba ◽  
Marcin Nyk ◽  
Marek Samoć
Keyword(s):  
Solid State ◽  
Conjugated Polymers ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Model Compounds ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Sensing Applications ◽  
Spectrally Resolved ◽  
The Impact

Nonlinear optical (NLO) pigments are compounds insoluble in solvents that exhibit phenomena related to nonlinear optical susceptibilities (χ(n) where n = 2,3,...), e.g., two-photon absorption (2PA) which is related to the imaginary part of χ(3). Determination of spectrally-resolved 2PA properties for NLO pigments of macromolecular nature, such as coordination polymers or crosslinked polymers, has long been a challenging issue due to their particulate form, precluding characterizations with standard techniques such as Z-scan. In this contribution, we investigate thus far unknown spectrally-resolved 2PA properties of a new subclass of NLO pigments—crosslinked conjugated polymers. The studied compounds are built up from electron-donating (triphenylamine) and electron-withdrawing (2,2’-bipyridine) structural fragments joined by vinylene (Pol1) or vinyl(4-ethynylphenyl) (Pol2) aromatic bridges. 2PA properties of these polymers have been characterized in broad spectral range by specially modified two-photon excited fluorescence (TPEF) techniques: solid state TPEF (SSTPEF) and internal standard TPEF (ISTPEF). The impact of self-aggregation of aromatic backbones on the 2PA properties of the polymers has been evaluated through extended comparisons of NLO parameters, i.e., 2PA cross sections (σ2) and molar-mass normalized 2PA merit factors (σ2/M) with those of small-molecular model compounds: Mod1 and Mod2. By doing this, we found that the 2PA response of Pol1 and Pol2 is improved 2–3 times versus respective model compounds in the solid state form. Further comparisons with 2PA results collected for diluted solutions of Mod1 and Mod2 supports the notion that self-aggregated structure contributes to the observed enhancement of 2PA response. On the other hand, it is clear that Pol1 and Pol2 suffer from aggregation-caused quenching phenomenon, well reflected in time-resolved fluorescence properties as well as in relatively low values of quantum yield of fluorescence. Accordingly, despite improved intrinsic 2PA response, the effective intensity of two-photon excited emission for Pol1 and Pol2 is slightly lower relative to Mod1 and Mod2. Finally, we explore temperature-resolved luminescence properties under one- (377 nm), two- (820 nm), and three-photon excitation (1020 nm) conditions of postsynthetically Eu3+-functionalized material, Pol1-Eu, and discuss its suitability for temperature sensing applications.

scholarly journals The Influence of Quantum Confinement on Third-Order Nonlinearities in Porous Silicon Thin Films

2018 ◽  
Vol 8 (10) ◽  
pp. 1810 ◽  
Author(s):  
Rihan Wu ◽  
Jack Collins ◽  
Leigh Canham ◽  
Andrey Kaplan
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Quantum Confinement ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Silicon Thin Films ◽  
Gaussian Decomposition

We present an experimental investigation into the third-order nonlinearity of conventional crystalline (c-Si) and porous (p-Si) silicon with Z-scan technique at 800-nm and 2.4- μ m wavelengths. The Gaussian decomposition method is applied to extract the nonlinear refractive index, n 2 , and the two-photon absorption (TPA) coefficient, β , from the experimental results. The nonlinear refractive index obtained for c-Si is 7 ± 2 × 10 − 6 cm 2 /GW and for p-Si is − 9 ± 3 × 10 − 5 cm 2 /GW. The TPA coefficient was found to be 2.9 ± 0.9 cm/GW and 1.0 ± 0.3 cm/GW for c-Si and p-Si, respectively. We show an enhancement of the nonlinear refraction and a suppression of TPA in p-Si in comparison to c-Si, and the enhancement gets stronger as the wavelength increases.

Two-photon absorption and nonlinear refraction of lanthanum sulfide-gallium sulfide glasses

1998 ◽  
Vol 84 (5) ◽  
pp. 2380-2384 ◽  
Author(s):  
Zhong Hua Zhou ◽  
Tadanori Hashimoto ◽  
Hiroyuki Nasu ◽  
Kanichi Kamiya
Keyword(s):  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Gallium Sulfide ◽  
Two Photon ◽  
Lanthanum Sulfide ◽  
Sulfide Glasses

Intensity scan and two photon absorption and nonlinear refraction of C60 in toluene

1996 ◽  
Vol 68 (10) ◽  
pp. 1317-1319 ◽  
Author(s):  
Bahman Taheri ◽  
Huimin Liu ◽  
B. Jassemnejad ◽  
D. Appling ◽  
Richard C. Powell ◽  
...  
Keyword(s):  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

Observation of Two-Photon Absorption and Nonlinear Refraction in AlN

2016 ◽  
Vol 33 (10) ◽  
pp. 104201 ◽  
Author(s):  
Meng Zhao ◽  
Chun-Hua Xu ◽  
Wei-Jie Hu ◽  
Wen-Jun Wang ◽  
Li-Wei Guo ◽  
...  
Keyword(s):  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

INVESTIGATION OF NEAR TWO-PHOTON RESONANCE OPTICAL NONLINEARITIES IN Ni(Ac)2[N-(8-QUINOLYL) PYRIDINE-2-CARBOXAMIDE] · 4H2O BY THE Z-SCAN TECHNIQUE

2003 ◽  
Vol 12 (01) ◽  
pp. 81-89 ◽  
Author(s):  
SHENG-LI GUO ◽  
HUI-TIAN WANG ◽  
N. B. MING ◽  
JUN-YONG ZHANG ◽  
ZHI-JIAN GUO
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Closed Aperture ◽  
Optical Nonlinearities ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nonlinear Optical Absorption ◽  
532 Nm ◽  
Photon Resonance

We describe a modified Z-scan technique for the case when nonlinear refraction is accompanied by nonlinear absorption to separately evaluate the nonlinear refraction and the nonlinear absorption by performing straightforward measurements with the aperture removed. We divide the closed aperture (S < 1) normalized Z-scan by a scan with an open aperture (S = 1). With nanosecond scale at a 532 nm wavelength, we first measured the nonlinear optical absorption and refraction coefficients of a solution of Ni(Ac)2[N-(8-quinolyl) pyridine-2-carboxamide] · 4H2O by using the modified Z-scan technique. The nonlinear absorption originates from the near resonant two-photon absorption while the mechanism of the nonlinear refraction is the near resonant two-photon absorption transition enhancement. The linear increasing dependences of the optical nonlinearities on the incident irradiance arise from the population redistribution due to the near resonant two-photon absorption.

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