scholarly journals Polariton Ring Currents and Circular Dichroism of Mg-porphyrin in a Chiral Cavity

2022 ◽  
Author(s):  
Shichao Sun ◽  
Bing Gu ◽  
S. Mukamel
Keyword(s):  
Circular Dichroism ◽  
Time Reversal ◽  
Optical Cavity ◽  
Polarized Light ◽  
Time Reversal Symmetry ◽  
Porphyrin Molecule ◽  
Ring Currents ◽  
Linearly Polarized ◽  
Circular Dichroïsm

By placing a Mg-porphyrin molecule in a chiral optical cavity, time reversal symmetry is broken, thus generating polariton ring currents even with linearly polarized light. These currents induce a circular...

scholarly journals Влияние поляризации считывающей волны и циркулярного дихроизма на дифракционную эффективность отражательной голограммы в кубическом оптически активном фоторефрактивном поглощающем пьезокристалле

2021 ◽  
Vol 129 (1) ◽  
pp. 66
Author(s):  
В.Н. Навныко ◽  
В.В. Шепелевич ◽  
С.М. Шандаров
Keyword(s):  
Circular Dichroism ◽  
Diffraction Efficiency ◽  
Polarized Light ◽  
Crystal Thickness ◽  
Light Waves ◽  
Linearly Polarized ◽  
Reflection Hologram ◽  
Phase Amplitude ◽  
Circular Dichroïsm ◽  
Phase Reflection

In the approximation of slowly varying amplitudes, a system of coupled waves equations is obtained, which is applicable for describing the diffraction and coupling of elliptically polarized light waves on a volume phase-amplitude holographic grating formed in a cubic optically active photorefractive absorbing piezoelectric crystal. The dependence of the diffraction efficiency of the phase reflection hologram on the ellipticity of the readout wave and the thickness of the Bi12SiO20 crystal of the (001) and (111) cuts was studied. The regularities of the effect of circular dichroism on the diffraction efficiency of the phase reflection hologram are analyzed. It is shown that for crystal of (001)-cut the maximum diffraction efficiency of the reflection hologram depending on the crystal thickness can be achieved using a readout wave both with linear polarization and with elliptical polarization. For crystal of (111)-cut the highest diffraction efficiency is achieved using a linearly polarized readout wave. It has been established that the effect of circular dichroism on the intensity of the reconstructed wave depends on the cut of the crystal, the ellipticity of the readout wave and the thickness of the crystal.

Efek Circular Dichroism pada Metamaterial Chiral Planar

2018 ◽  
Vol 2 (2) ◽  
pp. 49-52
Author(s):  
Juliasih Partini
Keyword(s):  
Circular Dichroism ◽  
Laser Light ◽  
Polarized Light ◽  
Polarization Plane ◽  
Sample Surface ◽  
Opposite Polarity ◽  
Linearly Polarized ◽  
The Right ◽  
Circular Dichroïsm ◽  
Chiral Metamaterial

Abstrak – Penelitian ini mengkaji efek circular dichroism pada metamaterial chiral planar. Bidang polarisasi akan terotasi ketika cahaya yang terpolarisasi linear melewati metamaterial chiral planar. Pada efek circular dichroism, cahaya yang terpolarisasi circular putaran kanan dan putaran kiri akan mempunyai perbedaan absorpsi dalam interaksinya dengan partikel penyusun metamaterial chiral planar. Spektrum eliptisitas metamaterial chiral planar menunjukkan eliptisitas bahan yang bernilai positif untuk sampel putar kanan dan bernilai negatif untuk sampel putar kiri. Nilai eliptisitas diperoleh sebesar maksimal +0,3 dan -0,3 terjadi pada frekuensi 1,29 THz. Eliptisitas maksimum menunjukkan adanya kopling antara foton dengan plasmon permukaan sampel. Polaritas yang berlawanan menunjukkan perbedaan absorbansi antara sampel putar kanan dan sampel putar kiri. Hasil tersebut juga menunjukkan adanya perubahan polarisasi linear pada laser femtosekon menjadi polarisasi eliptik pada  gelombang THz hasil emisi sampel metamaterial chiral planar. Kemampuan metamaterial chiral planar dalam memutar bidang polarisasi dan merubah menjadi polarisasi circular menjadikan bahan ini layak dijadikan alternatif polarisator dalam ranah terahertz.  Kata kunci: metamaterial, circular dichroism, chirality, polarisasi, eliptisitasAbstract – This paper describes the circular dichroism effect on planar chiral metamaterial. When a linearly polarized light passes through the planar chiral metamaterial, its polarization plane will rotate. On the circular dichroism effect, the right and left circulary polarized light will have different absorption due to its interaction with a planar chiral metamaterial. The ellipticity spectrum of a planar chiral metamaterial sample shows a positive ellipticity value for the counter clock-wise sample and a negative value for the clock-wise sample. The maximum ellipticity value is determine as +0,3 and -0,3 at frequency of 1,29 THz. The values show the existence of a coupling between photon and the sample surface plasmon. The opposite polarity indicates that the clock-wise and the counter clock-wise sample have different absorbance. The determined ellipticity value also reveals that the linearly polarized femtosecond laser light has transformed to elliptical polarized THz wave on a planar chiral metamaterial sample emission. The planar chiral metamaterial capability to rotate the polarization plane into circulary polarized wave, makes the material can be considered as an alternative polarizer in terahertz field.  Key words: metamaterial, circular dichroism, chirality, polarization, ellipticity

RESONANT SCATTERING OF POLARIZED X-RAYS AT THE 4d EDGE OF GADOLINIUM

2002 ◽  
Vol 09 (02) ◽  
pp. 977-981 ◽  
Author(s):  
J.-M. MARIOT ◽  
L. JOURNEL ◽  
R. DELAUNAY ◽  
C. F. HAGUE ◽  
M. SACCHI ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Energy Loss ◽  
Magnetic Circular Dichroism ◽  
Polarized Light ◽  
Electronic States ◽  
Resonant Scattering ◽  
X Rays ◽  
Linearly Polarized ◽  
The Impact ◽  
Circular Dichroïsm

The impact of resonant scattering of polarized X-rays is illustrated taking the gadolinium 4d edge energy range as an example. It is shown that: (i) the study of the reflection of linearly polarized light by a magnetized Gd sample gives information on the electronic states of the system, similar to that given by magnetic circular dichroism in absorption; (ii) the energy-loss peaks corresponding to spin-flip transitions in the 4d → 4f excitation exhibit a strong circular dichroism.

scholarly journals Mass-resolved electronic circular dichroism ion spectroscopy

Science ◽  
2020 ◽  
Vol 368 (6498) ◽  
pp. 1465-1468 ◽  
Author(s):  
Steven Daly ◽  
Frédéric Rosu ◽  
Valérie Gabelica
Keyword(s):  
Circular Dichroism ◽  
Three Dimensional ◽  
Polarized Light ◽  
Negative Ions ◽  
Data Interpretation ◽  
Electronic Circular Dichroism ◽  
Circularly Polarized Light ◽  
Chiral Compounds ◽  
Electron Photodetachment ◽  
Circular Dichroïsm

DNA and proteins are chiral: Their three-dimensional structures cannot be superimposed with their mirror images. Circular dichroism spectroscopy is widely used to characterize chiral compounds, but data interpretation is difficult in the case of mixtures. We recorded the electronic circular dichroism spectra of DNA helices separated in a mass spectrometer. We studied guanine-rich strands having various secondary structures, electrosprayed them as negative ions, irradiated them with an ultraviolet nanosecond optical parametric oscillator laser, and measured the difference in electron photodetachment efficiency between left and right circularly polarized light. The reconstructed circular dichroism ion spectra resembled those of their solution-phase counterparts, thereby allowing us to assign the DNA helical topology. The ability to measure circular dichroism directly on biomolecular ions expands the capabilities of mass spectrometry for structural analysis.

The chiral coating on an achiral nanostructure by the secondary effect in focused ion beam induced deposition

2021 ◽  
Author(s):  
Chen Fang ◽  
Qing Chai ◽  
Ye Chen ◽  
Yan Xing ◽  
Zai-fa Zhou
Keyword(s):  
Circular Dichroism ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Polarized Light ◽  
Localized Surface Plasmon ◽  
Light Illumination ◽  
Secondary Effect ◽  
Circularly Polarized Light ◽  
Optical Metamaterials ◽  
Circular Dichroïsm

Abstract Optical metamaterials are widely used in electromagnetic wave modulation due to their sub-wavelength feature sizes. In this paper, a method to plate an achiral nanopillar array with chiral coating by the secondary effect in focused ion beam induced deposition is proposed. Guided by the pattern defined in a bitmap with variable residence time, the beam scan strategy suppresses the interaction between adjacent nanostructures. A uniform chiral coating is formed on the target nanostructure without affecting the adjacent nanostructure, under carefully selected beam parameters and the rotation angle of the sample stage. Energy Dispersive X-Ray Spectroscopy results show that the chiral film has high purity metal, which enables the generation of localized surface plasmon resonances and causes the circular dichroism under circularly polarized light illumination. Finally, the tailorable circular dichroism spectrum of the coated array is verified by the Finite Difference Time Domain method.

Organic photodiodes from homochiral l-proline derived squaraine compounds with strong circular dichroism

2017 ◽  
Vol 19 (10) ◽  
pp. 6996-7008 ◽  
Author(s):  
Matthias Schulz ◽  
Majvor Mack ◽  
Oliver Kolloge ◽  
Arne Lützen ◽  
Manuela Schiek
Keyword(s):  
Circular Dichroism ◽  
Polarized Light ◽  
Active Layers ◽  
Circular Dichroïsm ◽  
Circular Dichroic ◽  
Circular Polarized Light

We demonstrate the feasibility of inserting highly circular dichroic active layers into an organic photodiode as a potential detector for circular polarized light.

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