Preparation of Chiral Polydiacetylene Films by Using Three-Photon Polymerization

2016 ◽  
Vol 16 (4) ◽  
pp. 3394-3397 ◽  
Author(s):  
Takaaki Manaka ◽  
Mitsumasa Iwamoto
Keyword(s):  
Laser Power ◽  
Polarized Light ◽  
Laser Wavelength ◽  
Polymerization Rate ◽  
Power Dependence ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Photo Polymerization ◽  
Left And Right ◽  
Asymmetric Polymerization

Asymmetric polymerization of polydiacetylene (PDA) from commercially available achiral derivative of diacetylene monomer using circularly polarized pulse laser is demonstrated. Chiral source was only circularly polarized laser, and irradiation of left- and right-circularly polarized light effectively promoted the polymerization of chiral PDAs with opposite handedness. Difference between the laser wavelength and the absorption peak of monomer suggested the contribution of the multiphoton excitation to the photo-polymerization. Laser power dependence of the polymerization rate indicated the possibility of three-photon polymerization.

Switchable 3D liquid crystal grating generated by periodic photo-alignment on both substrates

Soft Matter ◽  
2015 ◽  
Vol 11 (39) ◽  
pp. 7802-7808 ◽  
Author(s):  
I. Nys ◽  
J. Beeckman ◽  
K. Neyts
Keyword(s):  
Liquid Crystal ◽  
Diffraction Pattern ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left And Right ◽  
Photo Alignment ◽  
Alignment Layers ◽  
Liquid Crystal Grating

A planar liquid crystal (LC) cell is developed in which two photo-alignment layers have been illuminated with respectively a horizontal and a vertical diffraction pattern of interfering left- and right-handed circularly polarized light.

Multiphoton ionization of Li at the ruby laser wavelength

1979 ◽  
Vol 57 (10) ◽  
pp. 1770-1774 ◽  
Author(s):  
G. Wagner ◽  
N. R. Isenor
Keyword(s):  
Laser Radiation ◽  
Atomic Beam ◽  
Ruby Laser ◽  
Multiphoton Ionization ◽  
Polarized Light ◽  
Single Mode ◽  
Laser Wavelength ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Photon Process

Ionization of Li resulting from the interaction of pulsed single-mode (λ = 694.60 ± 0.05 nm, TEM00) ruby laser radiation with an atomic beam was observed. The results can be interpreted in terms of a four-photon process with three-photon resonances with levels in the vicinity of the 19P and 20P Rydberg levels of the unperturbed atom. Both linearly and circularly polarized light were used. The results are compared with the calculated results of others.

scholarly journals The Chirality Induction and Modulation of Polymers by Circularly Polarized Light

Symmetry ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 474 ◽  
Author(s):  
Guang Yang ◽  
Siyu Zhang ◽  
Jingang Hu ◽  
Michiya Fujiki ◽  
Gang Zou
Keyword(s):  
Synthesis Method ◽  
Polarized Light ◽  
Chiral Structure ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Functional Activities ◽  
Living Organisms ◽  
Asymmetric Polymerization ◽  
Origin Of Homochirality ◽  
Chiral Polymer

Chirality is a natural attribute nature of living matter and plays an important role in maintaining the metabolism, evolution and functional activities of living organisms. Asymmetric conformation represents the chiral structure of biomacromolecules in living organisms on earth, such as the L-amino acids of proteins and enzymes, and the D-sugars of DNA or RNA, which exist preferentially as one enantiomer. Circularly polarized light (CPL), observed in the formation regions of the Orion constellation, has long been proposed as one of the origins of single chirality. Herein, the CPL triggered asymmetric polymerization, photo-modulation of chirality based on polymers are described. The mechanisms between CPL and polymers (including polydiacetylene, azobenzene polymers, chiral coordination polymers, and polyfluorene) are described in detail. This minireview provides a promising flexible asymmetric synthesis method for the fabrication of chiral polymer via CPL irradiation, with the hope of obtaining a better understanding of the origin of homochirality on earth.

Optically active triptycenes containing hexa-peri-hexabenzocoronene units

2019 ◽  
Vol 55 (76) ◽  
pp. 11386-11389 ◽  
Author(s):  
Yuya Wada ◽  
Ken-ichi Shinohara ◽  
Tomoyuki Ikai
Keyword(s):  
Polarized Light ◽  
Optically Active ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left And Right

We have successfully generated both left- and right-handed circularly polarized light using crystals prepared from a racemic triptycene containing hexa-peri-hexabenzocoronene units.

Hameka theory of optical rotation

1968 ◽  
Vol 46 (4) ◽  
pp. 599-604 ◽  
Author(s):  
D. A. Hutchinson
Keyword(s):  
Scattering Amplitudes ◽  
Optical Rotation ◽  
Polarized Light ◽  
Electric Quadrupole ◽  
Refractive Indices ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Alternative Approach ◽  
Left And Right ◽  
The Difference

sRosenfeld's formula, for off-resonance optical rotation, is derived by an alternative approach. The scattering amplitudes are determined for the scattering of right circularly polarized light and left circularly polarized light by a molecule. The calculation is carried out to the order of approximation which includes electric quadrupole and magnetic dipole terms. From the real parts of the forward scattering amplitudes the corresponding indices of refraction are determined for left and right circularly polarized light. Rosenfeld's formula then follows from the difference between the two refractive indices.

Alteration of MCD Spectra Due to thin film Interference Effects

1997 ◽  
Vol 475 ◽  
Author(s):  
D. Rioux ◽  
B. Allen ◽  
H. Höchst ◽  
D. Zhao ◽  
D.L. Huber
Keyword(s):  
Line Shape ◽  
Magnetic Moments ◽  
Polarized Light ◽  
Excitation Wavelength ◽  
Interference Effects ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left And Right ◽  
Thin Film Interference ◽  
Film Substrate

ABSTRACTMCD spectra at the M2,3 edge of thin Fe films exhibit thickness-dependent variations in line shape as well as in the absolute MCD-effect. Our data indicate that more information is contained in the MCD spectra than simply the evolution of a magnetic moment and ferromagnetic order. We developed a model to predict line shape modulations as a function of film thickness and angle of light incidence. Using the Fresnel-Maxwell formalism we calculate interference effects between left and right circularly polarized light reflected from the vacuum-film-substrate interfaces which are verified by our MCD measurements. Since the observed interference effects are a function of the excitation wavelength, our results can be directly scaled to show the significance of these effects in the more commonly used L2,3 region of 3d ferromagnets. Our data point out that one might be ill advised to rely onL2,3 MCD experiments to try to extract the formation of magnetic moments in films of several 10s of Å in thickness.

scholarly journals Macroscopic chirality of twist-bend nematic phase in bent dimers confirmed by circular dichroism

2020 ◽  
Vol 8 (3) ◽  
pp. 1041-1047 ◽  
Author(s):  
Warren D. Stevenson ◽  
Xiangbing Zeng ◽  
Chris Welch ◽  
Anil K. Thakur ◽  
Goran Ungar ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Long Range ◽  
Nematic Phase ◽  
Polarized Light ◽  
Circular Dichroism Spectroscopy ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left And Right ◽  
Circular Dichroïsm

Long-range global chirality is confirmed in the twist-bend nematic phase of bent dimers using circular dichroism spectroscopy. The phase absorbs left and right circularly polarized light differently, confirming its helical rather than wavy character.

Left- and right-circularly polarized light-sensing based on colored and mechano-responsive chiral nematic liquid crystals

Soft Matter ◽  
2018 ◽  
Vol 14 (1) ◽  
pp. 27-30 ◽  
Author(s):  
Jun Yoshida ◽  
Shuhei Tamura ◽  
Hidetaka Yuge ◽  
Go Watanabe
Keyword(s):  
Organic Molecules ◽  
Dopant Concentration ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Light Sensing ◽  
Left Handed ◽  
Chiral Nematic ◽  
Left And Right ◽  
Guest System

A liquid crystal host–guest system composed of achiral organic molecules (host) and colored chiral metal complexes (guest) was fabricated to sense both right- and left-handed circularly polarized light (r- and l-CPL), depending on the guest (dopant) concentration.

scholarly journals The Fresnel triprism and the circular polarization of light

Photoniques ◽  
2019 ◽  
pp. 44-45
Author(s):  
Oriol Arteaga ◽  
Enric Garcia-Caurel ◽  
Razvigor Ossikovski
Keyword(s):  
Circular Polarization ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Polarized Beam ◽  
Left And Right ◽  
Polarization Of Light

In 1822 Augustin Fresnel discovered the circular polarization of light with an experiment in which a plane polarized beam was resolved into its left- and right- circularly polarized components after refraction at slightly different angles at the interface between two different species of quartz that formed a composite prism, called the Fresnel triprism. Fresnel’s landmark experiment, once popular, remains today a very little known method for producing circularly polarized light.

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