Mechanism of various ultrafast nonlinear optical responses in conjugated polymers

1993 ◽  
Author(s):  
Takayoshi Kobayashi
Keyword(s):  
Conjugated Polymers ◽  
Nonlinear Optical ◽  
Optical Responses

scholarly journals Linear and nonlinear optical responses in the chiral multifold semimetal RhSi

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Zhuoliang Ni ◽  
B. Xu ◽  
M.-Á. Sánchez-Martínez ◽  
Y. Zhang ◽  
K. Manna ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Chemical Potential ◽  
Technological Development ◽  
Optical Responses ◽  
Chiral Magnetic Effect ◽  
Hole Band ◽  
Linear And Nonlinear ◽  
Characteristic Features ◽  
Topological Semimetals ◽  
Terahertz Emission Spectroscopy

AbstractChiral topological semimetals are materials that break both inversion and mirror symmetries. They host interesting phenomena such as the quantized circular photogalvanic effect (CPGE) and the chiral magnetic effect. In this work, we report a comprehensive theoretical and experimental analysis of the linear and nonlinear optical responses of the chiral topological semimetal RhSi, which is known to host multifold fermions. We show that the characteristic features of the optical conductivity, which display two distinct quasi-linear regimes above and below 0.4 eV, can be linked to excitations of different kinds of multifold fermions. The characteristic features of the CPGE, which displays a sign change at 0.4 eV and a large non-quantized response peak of around 160 μA/V2 at 0.7 eV, are explained by assuming that the chemical potential crosses a flat hole band at the Brillouin zone center. Our theory predicts that, in order to observe a quantized CPGE in RhSi, it is necessary to increase the chemical potential as well as the quasiparticle lifetime. More broadly, our methodology, especially the development of the broadband terahertz emission spectroscopy, could be widely applied to study photogalvanic effects in noncentrosymmetric materials and in topological insulators in a contact-less way and accelerate the technological development of efficient infrared detectors based on topological semimetals.

scholarly journals Linear and nonlinear optical properties of the conjugated polymers PPV and MEH-PPV

1999 ◽  
Vol 59 (23) ◽  
pp. 15133-15142 ◽  
Author(s):  
S. J. Martin ◽  
D. D. C. Bradley ◽  
P. A. Lane ◽  
H. Mellor ◽  
P. L. Burn
Keyword(s):  
Optical Properties ◽  
Conjugated Polymers ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Linear And Nonlinear

Large concentration-dependent nonlinear optical responses of starburst diphenylaminofluorenocarbonyl methano[60]fullerene pentads

2007 ◽  
Vol 17 (18) ◽  
pp. 1826 ◽  
Author(s):  
Hendry I. Elim ◽  
Robinson Anandakathir ◽  
Rachel Jakubiak ◽  
Long Y. Chiang ◽  
Wei Ji ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Large Concentration ◽  
Optical Responses

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.

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