scholarly journals Resonance in Chirogenesis and Photochirogenesis: Colloidal Polymers Meet Chiral Optofluidics

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 199
Author(s):  
Michiya Fujiki
Keyword(s):  
Light Source ◽  
Nuclear Physics ◽  
Optical Rotation ◽  
Surrounding Medium ◽  
Polarized Light ◽  
Excitation Wavelength ◽  
Light Sources ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Resonance Effects

Metastable colloids made of crystalline and/or non-crystalline matters render abilities of photonic resonators susceptible to chiral chemical and circularly polarized light sources. By assuming that μm-size colloids and co-colloids consisting of π- and/or σ-conjugated polymers dispersed into an optofluidic medium are artificial models of open-flow, non-equilibrium coacervates, we showcase experimentally resonance effects in chirogenesis and photochirogenesis, revealed by gigantic boosted chiroptical signals as circular dichroism (CD), optical rotation dispersion, circularly polarized luminescence (CPL), and CPL excitation (CPLE) spectral datasets. The resonance in chirogenesis occurs at very specific refractive indices (RIs) of the surrounding medium. The chirogenesis is susceptible to the nature of the optically active optofluidic medium. Moreover, upon an excitation-wavelength-dependent circularly polarized (CP) light source, a fully controlled absolute photochirogenesis, which includes all chiroptical generation, inversion, erase, switching, and short-/long-lived memories, is possible when the colloidal non-photochromic and photochromic polymers are dispersed in an achiral optofluidic medium with a tuned RI. The hand of the CP light source is not a determining factor for the product chirality. These results are associated with my experience concerning amphiphilic polymerizable colloids, in which, four decades ago, allowed proposing a perspective that colloids are connectable to light, polymers, helix, coacervates, and panspermia hypotheses, nuclear physics, biology, radioisotopes, homochirality question, first life, and cosmology.

Development and performance of a versatile soft X-ray polarimeter

2010 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
H. Wang ◽  
U. H. Wagner ◽  
S. S. Dhesi ◽  
K. J. S. Sawhney ◽  
F. Maccherozzi ◽  
...  
Keyword(s):  
Light Source ◽  
Rare Earths ◽  
Polarization State ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
X Ray ◽  
Arbitrary Polarization ◽  
And Performance ◽  
Transmission Phase

With modern undulators generating light of an arbitrary polarization state, experiments exploiting this feature in the soft X-ray region are becoming increasingly widespread. Circularly polarized light in the soft X-ray region is of particular interest to investigate of magnetic metals such as Fe, Co and Ni, and the rare earths. A versatile multilayer polarimeter has been designed and developed to characterize the polarization state of the soft X-ray beam. A W/B4C multilayer transmission phase retarder and reflection analyser has been used for polarimetry measurements on the beamline (I06) at Diamond Light Source. The design details of the polarimeter and preliminary polarimetry results are presented.

scholarly journals Polarized electrons at NIKHEF

2020 ◽  
Vol 6 ◽  
pp. 331
Author(s):  
N. H. Papadakis ◽  
Et al.
Keyword(s):  
Electron Beam ◽  
Repetition Rate ◽  
Nuclear Physics ◽  
Pulse Length ◽  
Polarized Light ◽  
Budker Institute ◽  
Polarized Electrons ◽  
Circularly Polarized Light ◽  
Semiconductor Physics ◽  
Circularly Polarized

A design for producing a beam of longitudinally polarized electrons stored in the AmPS ring has been made by a collaboration between NIKHEF, the Budker Institute for Nuclear Physics (BINP) and the Institute of Semiconductor Physics (ISP) from Novosibirsk. The polarized electrons are produced by illuminating a photoemissive cathode with circularly polarized light. A 100 keV electron beam with a peak current up to 40 mA and a pulse length up to 4 μσ is extracted from the cathode at a maximum repetition rate of 2 Hz.

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.

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.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

Blue Circularly Polarized Luminescent Amorphous Molecules with Single-handed Propeller Chirality Induced by Circularly Polarized Light Irradiation

2021 ◽  
Author(s):  
Zhaoming Zhang ◽  
Takunori Harada ◽  
Adriana Pietropaolo ◽  
Yuting Wang ◽  
Yue Wang ◽  
...  
Keyword(s):  
Polarized Light ◽  
Light Irradiation ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Trigonal Symmetry ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence

Preferred-handed propeller conformation was induced by circularly polarized light irradiation to three amorphous molecules with trigonal symmetry, and the molecules with induced chirality efficiently exhibited blue circularly polarized luminescence. In...

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