INTERBAND TWO-PHOTON TRANSITION IN MOTT INSULATOR AS A NEW MECHANISM FOR ULTRAFAST OPTICAL NONLINEARITY

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3628-3632 ◽  
Author(s):  
M. Ashida ◽  
T. Ogasawara ◽  
N. Motoyama ◽  
H. Eisaki ◽  
S. Uchida ◽  
...  
Keyword(s):  
Excited State ◽  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearity ◽  
Infrared Region ◽  
Pump Probe ◽  
Two Photon ◽  
Ultrafast Optical ◽  
Order Of Magnitude ◽  
Probe Transmission

The dimensionality dependence of optical nonlinearity in cuprates was investigated by sub-picosecond pump-probe transmission measurements in the near-infrared region. It was found that cuprates with one-dimensional Cu-O networks show nonlinearity one order of magnitude larger than that of conventional band semiconductors and picosecond relaxation of the excited state. In contrast, a two-dimensional cuprate shows one order of magnitude smaller nonlinearity and slower decay of the excited state, as well as picosecond relaxation. The possibility for application of the present material to all-optical switching devices is also discussed.

scholarly journals Ultrafast sub–30-fs all-optical switching based on gallium phosphide

2019 ◽  
Vol 5 (6) ◽  
pp. eaaw3262 ◽  
Author(s):  
Gustavo Grinblat ◽  
Michael P. Nielsen ◽  
Paul Dichtl ◽  
Yi Li ◽  
Rupert F. Oulton ◽  
...  
Keyword(s):  
Gallium Phosphide ◽  
Optical Switching ◽  
Near Infrared ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Linear Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
All Optical ◽  
All Optical Switching

Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (λ > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub–30-fs (full width at half maximum) transmission modulation of up to ~70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by theZ-scan approach indicate that the transmission modulation arises from the optical Kerr effect and two-photon absorption. Because of the absence of linear absorption, no slower free-carrier contribution is detected. These findings place GaP as a promising ultrafast material for all-optical switching at modulation speeds of up to 20 THz.

A series of terpyridine-based zinc(ii) complexes assembled for third-order nonlinear optical responses in the near-infrared region and recognizing lipid membranes

2017 ◽  
Vol 5 (31) ◽  
pp. 6348-6355 ◽  
Author(s):  
Yiwen Tang ◽  
Ming Kong ◽  
Xiaohe Tian ◽  
Jinghang Wang ◽  
Qingyuan Xie ◽  
...  
Keyword(s):  
Lipid Membranes ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Infrared Region ◽  
Biological Imaging ◽  
Tissue Penetration ◽  
Third Order ◽  
Two Photon ◽  
Optical Responses ◽  
Near Infrared Region

Two-photon (TP) microscopy has advantages for biological imaging in that it allows deeper tissue-penetration and excellent resolution compared with one-photon (OP) microscopy.

Quenching effect of C-H bond in long lived NIR luminescent erbium complexes

2013 ◽  
Vol 1571 ◽  
Author(s):  
Laurent Divay ◽  
Christophe Galindo ◽  
Françoise Soyer ◽  
Evelyne Chastaing ◽  
Renato Bisaro ◽  
...  
Keyword(s):  
Excited State ◽  
Phenyl Ring ◽  
Near Infrared ◽  
Organic Ligand ◽  
Excited State Lifetime ◽  
Quenching Effect ◽  
Infrared Luminescence ◽  
Powder Samples ◽  
Order Of Magnitude ◽  
Erbium Ion

AbstractErbium excited state deactivation is studied for two fluorinated complexes based on N-(P,P-ditetrafluorophosphinoyl-P,P-ditetrafluorophenyl phosphinimidates and N-(P,P-dipentafluoro phosphinoyl)-P,P-dipentafluorophenyl phosphinimidates ligands. We show that the substitution of a fluorine atom in para-position by an hydrogen atom on each phenyl ring of the perfluorinated organic ligand results in a decrease in near infrared luminescence lifetimes from 800 µs to 70 µs when measured under vacuum on sublimated powder samples. These experiments show that the introduction of C-H bonds, although outside the first coordination sphere of the erbium ion, can still induce a one order of magnitude decrease in its excited state lifetime. The found lifetime however is still longer than most reported partially fluorinated complexes, which opens the way for new functionalized complexes.

Optical nonlinearity of zeolitic imidazolate framework-67 in the near-infrared region

2020 ◽  
Vol 4 (7) ◽  
pp. 2081-2088 ◽  
Author(s):  
Han Pan ◽  
Hongwei Chu ◽  
Xiao Wang ◽  
Ying Li ◽  
Shengzhi Zhao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Nonlinearity ◽  
Infrared Region ◽  
Optical Devices ◽  
Optical Nonlinearities ◽  
Third Order ◽  
Zeolitic Imidazolate Framework ◽  
Nonlinear Optical Devices ◽  
Near Infrared Region ◽  
Order Susceptibility

Optical nonlinearities of zeolitic imidazolate framework-67 (ZIF-67) were determined in the near-infrared region. The high TPA cross section and large third-order susceptibility demonstrate the potential of ZIF-67 for nonlinear optical devices.

scholarly journals Plasmon-Waveguide Resonances with Enhanced Figure of Merit and Their Potential for Anisotropic Biosensing in the Near Infrared Region

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Said Mahajna ◽  
Michal Neumann ◽  
Ofer Eyal ◽  
Atef Shalabney
Keyword(s):  
Figure Of Merit ◽  
Near Infrared ◽  
Propagation Distance ◽  
Infrared Region ◽  
Enhanced Sensitivity ◽  
Guided Modes ◽  
Order Of Magnitude ◽  
High Figure ◽  
Near Infrared Region ◽  
Waveguide Resonance

The TM and TE guided modes in the coupled plasmon-waveguide resonance configuration are investigated in the spectral domain. Here we use the modes dispersion to study their capability for sensing in the near infrared region. It is shown that the spectral widths of the guided modes are, at least, one order of magnitude smaller than the conventional surface plasmon resonance counterpart. The enhanced sensitivity and figure of merit of the guided modes reveal their potential for sensing in the spectral interrogation method where the traditional configurations are inherently limited. Moreover, the high resolution associated with the narrow resonances and the polarization dependence make these modes very promising for anisotropic biosensing in the spectral interrogation approach. The extremely high figure of merit, large penetration depth, and propagation distance in the near infrared region open the possibility of combining the plasmon-waveguide configuration with absorption spectroscopy techniques for molecular recognition.

Two-Photon Absorption-Free Ultrafast Optical Switching in Carbon-Rich SixC1−xMicroring

2017 ◽  
Vol 2 (9) ◽  
pp. 1700095 ◽  
Author(s):  
Bo-Ji Huang ◽  
Chung-Lun Wu ◽  
Yung-Hsiang Lin ◽  
Huai-Yung Wang ◽  
Cheng-Ting Tsai ◽  
...  
Keyword(s):  
Optical Switching ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Ultrafast Optical

The Characteristics of All-Optical Switching and Modulation in Phenoxy-Phthalocyanines Liquid

2013 ◽  
Vol 284-287 ◽  
pp. 2830-2834
Author(s):  
Yun Dong Zhang ◽  
Cheng Bao Yao ◽  
Hai Tao Yin ◽  
Chang Qiu Yu ◽  
Jin Li ◽  
...  
Keyword(s):  
Excited State ◽  
Light Intensity ◽  
Response Time ◽  
Optical Switching ◽  
Pump Light ◽  
Pump Probe ◽  
All Optical ◽  
Probe Experiment ◽  
Pump Probe Experiment ◽  
All Optical Switching

We present our experimental results on the measurements of excited state dynamics in 2, 9, 16, 23-phenoxy-phthalocyanine (Pc1) and 2, 9, 16, 23-phenoxy-phthalocyanine-zinc (Pc2) using the pump-probe experiment. The results show that the All-Optical Switching (A-OS) response time of Pc2 longer than that of Pc1, and switch-off and -on times of A-OS for Pc2 are 1.2 and 11.6 μs and for Pc1 are 2.3 and 7.8 μs at the same intensity. Moreover, analysis of modulation characteristics of A-OS shows that the stronger the light intensity of the pump light is, the smaller the normalized transmittance is and the shorter the response time of A-OS is. The consequences of such short lifetimes are also discussed in view of the strong A-OS properties of these molecules.

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