Cylindrical Aggregates of TDBC: Linear and Nonlinear Optical Properties Versus Morphology

The linear and nonlinear optical properties of pure 3,3'-bis(3-carboxypropyl)-5,5',6,6'- tetrachloro-1,1'-dioctylbenzimidacarbocyanine (C8O3) aggregates as well as of C8O3 aggregates in the presence of PVA are studied at room temperature. The obtained results reveal that absorption spectra of both aggregates are governed by four absorption bands. Three of these represent transitions having dipole moments oriented parallel to the axis of the aggregate and one oriented perpendicular to it. The two lower energy parallel transitions are found to be weakly coupled which suggests that they represent two excitons located on different walls of the double-wall cylinder. In contrast, the lowest energy parallel transition and the transition having a transition dipole moment oriented perpendicular to the aggregate axis share the same ground state which reveals that they belong to the same exciton band. The manner of modification of the linear absorption with addition of PVA as well as the similarity of the pump-probe spectra of the two investigated aggregates suggests that this exciton band originates from the inner wall of the double-wall cylinder.

Download Full-text

SIZE EFFECT OF ENCASED ATOM ON ABSORPTION AND NONLINEAR OPTICAL PROPERTIES OF EMBEDDED METALLOFULLERENES M@C82 (M = Sc, Y, La)

Journal of Theoretical and Computational Chemistry ◽

10.1142/s021963360800409x ◽

2008 ◽

Vol 07 (04) ◽

pp. 737-749 ◽

Cited By ~ 8

Author(s):

HUI HU ◽

WEN-DAN CHENG ◽

SHU-PING HUANG ◽

ZHI XIE ◽

HAO ZHANG

Keyword(s):

Optical Properties ◽

Nonlinear Optical ◽

Atomic Radius ◽

Optical Response ◽

Nonlinear Optical Properties ◽

Nonlinear Optical Response ◽

Photon Absorption ◽

Absorption Bands ◽

Third Order ◽

Linear Absorption

The linear absorption spectra and third-order nonlinear optical properties of M@ C 82 (M = Sc , Y , La ) nanostructural materials, whose configurations were optimized at the unrestricted open shell UB3LYP level, are simulated by the sum-over-states combined with the time-dependent UB3LYP methods. The obtained results show that the electronic absorption bands have redshifts, and the values of third-order nonlinear optical polarizabilities and two-photon absorption cross sections increase for M@ C 82 fullerenes (M = Sc , Y , La ) as the atomic radius of encased metal M increase in the order of Sc → Y → La . It is indicated that the electron-donating ability from the encased M atom to cage C 82 decreases or the electron-accepting ability from C 82 to M atom increases as the atomic radius of M increases, which results in third-order nonlinear optical response enhancement in the order of Sc @ C 82 < Y @ C 82 < La @ C 82. This gives a clue to design the nanostructural materials of encased fullerenes having a large nonlinear optical response.

Download Full-text

Linear and Nonlinear Optical Properties of Metal Nanoclustersilica Composites Formed by Implantation of Sb in High Purity Silica

MRS Proceedings ◽

10.1557/proc-438-429 ◽

1996 ◽

Vol 438 ◽

Cited By ~ 1

Author(s):

R. H. Magruder ◽

R. A. Weeks ◽

T. S. Anderson ◽

R. A. Zuhr

Keyword(s):

Optical Properties ◽

Nonlinear Optical ◽

Volume Fraction ◽

Nonlinear Optical Properties ◽

Index Of Refraction ◽

Metal Colloids ◽

Linear Absorption ◽

Nonlinear Properties ◽

Nonlinear Index ◽

Linear And Nonlinear

AbstractThe linear and nonlinear optical properties of a series of Sb nanometer dimension metal colloids in silica were measured. The colloids were fabricated by the implantation of Sb in silica with nominal doses of 3, 6 and 9x1016 ions/cm2 at 320 keV. The linear optical response was measured from 200 to 900 nm. The nonlinear optical properties were measured using the z-scan technique at wavelengths of 596 and 617 nm. The results are compared to linear and nonlinear properties of a sample implanted with 6x1016 Ag ions/cm 2. Both absorption and the nonlinear index of refraction increase with increasing volume fraction for the Sb implanted samples. The lower linear absorption and comparable nonlinear index of refraction for the Sb colloid-glass composites may be better for devices than composites using metal colloids that have a surface plasmon resonance.

Download Full-text

Synthesis, linear and nonlinear optical properties of thermally stable ferrocene-diketopyrrolopyrrole dyads

RSC Advances ◽

10.1039/c5ra17977g ◽

2015 ◽

Vol 5 (103) ◽

pp. 84643-84656 ◽

Cited By ~ 24

Author(s):

Sarbjeet Kaur ◽

Sugandha Dhoun ◽

Griet Depotter ◽

Paramjit Kaur ◽

Koen Clays ◽

...

Keyword(s):

Optical Properties ◽

Nonlinear Optical ◽

Dipole Moments ◽

Second Order ◽

Nonlinear Optical Properties ◽

Thermally Stable ◽

Linear And Nonlinear

Thermally stable ferrocene-DPP dyads exhibit non-zero dipole moments as well as negative solvatochromism and show structure dependent second-order nonlinear polarizabilities.

Download Full-text

Theoretical study on nonlinear optical properties of N-(6-hydroxyhexyl)-5-nitroazophenyl carbazole

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863518500364 ◽

2018 ◽

Vol 27 (04) ◽

pp. 1850036

Author(s):

Quanjie Zhong ◽

Jian Zheng ◽

Lin Zhang ◽

Xuan Luo

Keyword(s):

Optical Properties ◽

Charge Transfer ◽

Excited States ◽

Density Functional ◽

Nonlinear Optical ◽

Dipole Moments ◽

Electron Excitation ◽

Nonlinear Optical Properties ◽

Transition Dipole ◽

Leading Role

The first-, second- and third-order nonlinear optical properties of N-(6-hydroxyhexyl)-5-nitroazophenyl carbazole in gas phase employing sum-over-states (SOS) method have been calculated for the first time. The ground state molecular structure of N-(6-hydroxyhexyl)-5-nitroazophenyl carbazole was obtained by the geometrical optimizations based on the B3LYP/6-31[Formula: see text]G(d) level. The energy of excited states and transition dipole moments between different excited states were obtained by using the time-dependent density functional theory (TDDFT) based on the CAM-B3LYP/Sadlej POL level. Charge transfer during electron excitation was analyzed based on hole and electron distributions. Our calculations showed that the N-(6-hydroxyhexyl)-5-nitroazophenyl carbazole has good nonlinear optical properties and its nonlinear optical properties arise from charge-transfer excitation and local excitation but charge transfer plays the leading role.

Download Full-text

Substituent effects on linear and nonlinear optical properties of fluorescent (E)-2-(4-halophenyl)-7-arlstyrylimidazo[1,2-A]pyridine: spectroscopic and computational methods

Physical Sciences Reviews ◽

10.1515/psr-2018-0032 ◽

2018 ◽

Vol 4 (4) ◽

Author(s):

Siddheshwar D. Jadhav ◽

Ponnadurai Ramasami ◽

Nagaiyan Sekar

Keyword(s):

Optical Properties ◽

Excited State ◽

Nonlinear Optical ◽

Dipole Moments ◽

Nonlinear Optical Properties ◽

Photon Absorption ◽

Degree Of Polarization ◽

Hammett Constant ◽

Linear And Nonlinear ◽

The Difference

Abstract Effects of alkylamino and bromo substituents on imidazo[1,2-a]pyridines containing donor-π-acceptor type groups were comprehensively investigated for their linear and nonlinear optical properties by solvatochromic and DFT (CAM-B3LYP and BHandHLYP) methods. The difference between the ground and excited dipole moments as well as their ratios obtained by solvatochromic analysis indicate that the excited state is more polar than the ground state for both the bromo and diethyl amino derivative. More than twofold enhancement in the excited state dipole moments was observed as revealed by the difference and ratio of dipole moment upon the introduction of alkylamino donor group and these suggest large intramolecular charge transfer in the dyes. Stabilization energy above 20 kJ/mol was observed for large number of electron donor–acceptor interactions in Natural Bonding Orbital (NBO) analysis. Bond length alternation (BLA) and Bond order alternation (BOA) values tend to zero suggesting a high degree of polarization in the dyes. Enhancement in mean polarizability (α0), first hyperpolarizability (β0) and second static hyperpolarizabilities ( $\bar \gamma$) were observed by the introduction of alkylamino and bromo group in place of chloro in spite of the fact that Hammett constant of chloro and bromo are the same. The dyes have fundamental and intrinsic properties within the Hamiltonian limits. The two-photon absorption cross section value (≈100 GM) is comparable with LDS-698, a commercial TPA dye. This investigation is important for understanding the electronic structure of imidazo[1,2-a]pyridine with active functional groups and extending the potential for optical applications.

Download Full-text