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.

scholarly journals Enantioselective fragmentation of an achiral molecule in a strong laser field

2019 ◽  
Vol 5 (3) ◽  
pp. eaau7923 ◽  
Author(s):  
K. Fehre ◽  
S. Eckart ◽  
M. Kunitski ◽  
M. Pitzer ◽  
S. Zeller ◽  
...  
Keyword(s):  
Single Molecule ◽  
Light Propagation ◽  
Polarized Light ◽  
Strong Laser Field ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Single Molecule Level ◽  
The Difference ◽  
Living Nature ◽  
Chiral Species

Chirality is omnipresent in living nature. On the single molecule level, the response of a chiral species to a chiral probe depends on their respective handedness. A prominent example is the difference in the interaction of a chiral molecule with left or right circularly polarized light. In the present study, we show by Coulomb explosion imaging that circularly polarized light can also induce a chiral fragmentation of a planar and thus achiral molecule. The observed enantiomer strongly depends on the orientation of the molecule with respect to the light propagation direction and the helicity of the ionizing light. This finding might trigger new approaches to improve laser-driven enantioselective chemical synthesis.

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.

Polarizability and hyperpolarizability

1979 ◽  
Vol 293 (1402) ◽  
pp. 239-248 ◽  
Keyword(s):  
Light Scattering ◽  
Time Reversal ◽  
Optical Rotation ◽  
Polarized Light ◽  
Nonlinear Polarization ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Space And Time ◽  
Depolarization Of Light ◽  
Molecular Polarizabilities

The oscillating charge and current distributions induced in matter by a beam of light are expressed in terms of molecular polarizabilities and hyperpolarizabilities. The symmetry of these property tensors under space and time reversal is examined and methods for their measurement considered. Depolarization of light scattering, optical rotation and differential scattering of right and left circularly polarized light are discussed, as are the effects of vibration and of collisions on the intensities of light scattering. Nonlinear polarization and the measurement of hyperpolarizabilities are briefly examined.

Electric-field-induced differential scattering of right and left circularly polarized light

1975 ◽  
Vol 345 (1642) ◽  
pp. 365-377 ◽  
Keyword(s):  
Electric Field ◽  
Optical Activity ◽  
Electromagnetic Waves ◽  
Polarized Light ◽  
Static Electric Field ◽  
Circularly Polarized Light ◽  
Active Systems ◽  
Circularly Polarized ◽  
Dipolar Molecules ◽  
The Difference

The differential scattering of right and left circularly polarized light is a manifestation of optical activity. Both naturally optically active systems and fluids in a magnetic field parallel to the direction of propagation exhibit differential scattering. Although there is no electric analogue of Faraday’s effect, a static electric field applied to a fluid perpendicular to the direction of propagation induces a difference in the scattered intensities of right and left circularly polarized light. The difference is linear in the field strength. It is determined by the effect of the field on the polarizabilities producing optical activity and is present in all matter, including monatomic gases. The classical theory of the scattering of electromagnetic waves is used in a formulation of the general theory of light scattering in an electric field. Results are given for some particular symmetries, including spherical, tetrahedral and dipolar molecules, and estimates of the magnitude of the effect are made.

scholarly journals Measuring circular phase-dichroism of chiral metasurface

Nanophotonics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 909-920 ◽  
Author(s):  
Ranran Zhang ◽  
Qiuling Zhao ◽  
Xia Wang ◽  
Wensheng Gao ◽  
Jensen Li ◽  
...  
Keyword(s):  
Incident Light ◽  
Polarized Light ◽  
Visible Range ◽  
Chiral Media ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Reflection Phase ◽  
Full Wave ◽  
Potential Applications ◽  
The Difference

AbstractThe ability of chiral media to differentiate circularly polarized light is conventionally characterized by circular dichroism (CD) which is based on the difference in the absorption of the incident light for different polarizations. Thus, CD probes the bulk properties of chiral media. Here, we introduce a new approach termed as circular phase-dichroism that is based on the surface properties and is defined as the difference of the reflection phase for different circularly polarized incident lights in characterizing chiral media. As a demonstration, we measure the reflection phase from planar chiral sawtooth metasurface for circularly polarized light in the visible range using a simple Fabry Perot interference technique. The measured circular phase-dichroism is also crosschecked by conventional CD measurement of the transmitted light and by full-wave simulations. Our results demonstrate the potential applications of circular phase-dichroism in sensing and metasurface characterizations.

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.

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.

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