scholarly journals Multi-Mode Circular Dichroism in N-Fold Rotational Symmetric Metamaterials

2021 ◽  
Author(s):  
Shihao Li ◽  
Kejian Chen ◽  
Yeli Xu ◽  
Yan Chen
Keyword(s):  
Circular Dichroism ◽  
Physical Mechanism ◽  
Rotation Angle ◽  
Wavelength Band ◽  
Design Strategies ◽  
Infrared Band ◽  
Nano Structures ◽  
Potential Applications ◽  
Circular Dichroïsm ◽  
Multi Mode

Abstract In this article, the effects of the rotation angle between upper and lower n-fold rotational symmetric nano-structures are studied. Various modes of circular dichroism (single wavelength band, dual-wavelength bands, and more than two wavelength bands) in the wavelength band from 3.3 to 5 µm are realized. Absorption up to 0.994 and absorptive circular dichroism up to 0.867 are observed. Meanwhile, sensitivity of circular dichroism to the rotation angle and reconfigure strategy for opposite responses has been discussed. Based on Born-Kuhn model, physical mechanism of mode’s switching is explained with charge distributions. The multi-mode chiroptical responses in mid-infrared band and the variety of design strategies have potential applications in the field of thermal remote sensing detection and tunable multi-band chiral devices.

Photothermal Circular Dichroism Induced by Plasmon Resonances in Chiral Metamaterial Absorbers and Bolometers

2018 ◽  
Author(s):  
Xiang-Tian Kong ◽  
Larousse Khosravi Khorashad ◽  
Zhiming Wang ◽  
Alexander O. Govorov
Keyword(s):  
Circular Dichroism ◽  
Molecular System ◽  
Polarized Light ◽  
Photothermal Effect ◽  
Circularly Polarized Light ◽  
Equivalent Effect ◽  
Potential Applications ◽  
New Type ◽  
Temperature Maps ◽  
Circular Dichroïsm

Chiral photochemistry remains a challenge because of the very small asymmetry in the chiro-optical absorption of molecular species. However, we think that the rapidly developing fields of plasmonic chirality and plasmon-induced circular dichroism demonstrate very strong chiro-optical effects and have the potential to facilitate the development of chiral photochemistry and other related applications such as chiral separation and sensing. In this study, we propose a new type of chiral spectroscopy – photothermal circular dichroism. It is already known that the planar plasmonic superabsorbers can be designed to exhibit giant circular dichroism signals in the reflection. Therefore, upon illumination with chiral light, such planar metastructures should be able to generate a strong asymmetry in their local temperatures. Indeed, we demonstrate this chiral photothermal effect using a chiral plasmonic absorber. Calculated temperature maps show very strong photothermal circular dichroism. One of the structures computed in this paper could serve as a chiral bolometer sensitive to circularly polarized light. Overall, this chiro-optical effect in plasmonic metamaterials is much greater than the equivalent effect in any chiral molecular system or plasmonic bio-assembly. Potential applications of this effect are in polarization-sensitive surface photochemistry and chiral bolometers.

scholarly journals Multi-mode circular dichroism in n-fold rotational symmetric metamaterials

2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Shihao Li ◽  
Kejian Chen ◽  
Yeli Xu ◽  
Yan Chen
Keyword(s):  
Circular Dichroism ◽  
Circular Dichroïsm ◽  
Multi Mode

scholarly journals Time Resolved Transient Circular Dichroism Spectroscopy Using Synchrotron Natural Polarisation

2019 ◽  
Author(s):  
François Auvray ◽  
David Dennetière ◽  
Alexandre Giuliani ◽  
Frédéric Jamme ◽  
Frank Wien ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Synchrotron Radiation ◽  
Nano Structure ◽  
Time Resolved ◽  
New Approach ◽  
X Ray Scattering ◽  
Wide Range ◽  
Potential Applications ◽  
Acquisition Speed ◽  
Circular Dichroïsm

<a>Ultraviolet (UV) synchrotron radiation circular dichroism (SRCD) spectroscopy has made an important contribution to the determination and understanding of the structure of biomolecules. In this paper, we demonstrate an innovative time-resolved SRCD (tr-SRCD) technique, overcoming limitations of current broadband UV SRCD setups, to access ultrafast (down to nanoseconds) time-scales, previously measurable only by other techniques, such as infrared (IR), nuclear magnetic resonance (NMR), fluorescence and absorbance spectroscopies and small angle X-ray scattering (SAXS). The tr-SRCD setup takes advantage of the natural polarisation of the synchrotron radiation emitted by a bending magnet to record broadband UV CD faster than any current SRCD setup, improving the acquisition speed from 10 mHz to 130 Hz and the accessible temporal resolution by 11 orders of magnitude. We illustrate the new approach by following the photoisomerization of an azopeptide. This breakthrough in SRCD spectroscopy opens up a wide range of potential applications to the detailed characterisation of biological processes, such as protein folding, protein-ligand binding and DNA nano-structure formation.<br></a>

Time Resolved Transient Circular Dichroism Spectroscopy Using Synchrotron Natural Polarisation

2019 ◽  
Author(s):  
François Auvray ◽  
David Dennetière ◽  
Alexandre Giuliani ◽  
Frédéric Jamme ◽  
Frank Wien ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Synchrotron Radiation ◽  
Time Resolved ◽  
New Approach ◽  
X Ray Scattering ◽  
Wide Range ◽  
Potential Applications ◽  
Acquisition Speed ◽  
Concentration Changes ◽  
Circular Dichroïsm

<a> </a><p><a></a><a>Ultraviolet (UV) synchrotron radiation circular dichroism (SRCD) spectroscopy has made an important contribution to the determination and understanding of the structure of bio-molecules. In this paper, we report an innovative</a> approach that we term time-resolved SRCD (tr-SRCD), which overcomes the limitations of current broadband UV SRCD setups. This technique allows accessing ultrafast time scales (down to nanoseconds), previously measurable only by other methods, such as infrared (IR), nuclear magnetic resonance (NMR), fluorescence and absorbance spectroscopies and small angle X-ray scattering (SAXS). The tr-SRCD setup takes advantage of the natural polarisation of the synchrotron radiation emitted by a bending magnet to record broadband UV CD faster than any current SRCD setup, improving the acquisition speed from 10 mHz to 130 Hz and the accessible temporal resolution by several orders of magnitude. We illustrate the new approach by following the isomers concentration changes of an azopeptide after a photoisomerisation. This breakthrough in SRCD spectroscopy opens up a wide range of potential applications to the detailed characterisation of biological processes, such as protein folding, protein-ligand binding.<a></a></p>

scholarly journals Investigation of Magnetic Circular Dichroism Spectra of Semiconductor Quantum Rods and Quantum Dot-in-Rods

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1059
Author(s):  
Farrukh Safin ◽  
Vladimir Maslov ◽  
Yulia Gromova ◽  
Ivan Korsakov ◽  
Ekaterina Kolesova ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Quantum Dot ◽  
Magnetic Circular Dichroism ◽  
Data Fitting ◽  
Electronic Transitions ◽  
Quantum Nanostructures ◽  
Quantum Rods ◽  
Potential Applications ◽  
Circular Dichroïsm ◽  
Magnetic Circular Dichroism Spectra

Anisotropic quantum nanostructures have attracted a lot of attention due to their unique properties and a range of potential applications. Magnetic circular dichroism (MCD) spectra of semiconductor CdSe/ZnS Quantum Rods and CdSe/CdS Dot-in-Rods have been studied. Positions of four electronic transitions were determined by data fitting. MCD spectra were analyzed in the A and B terms, which characterize the splitting and mixing of states. Effective values of A and B terms were determined for each transition. A relatively high value of the B term is noted, which is most likely associated with the anisotropy of quantum rods.

Time Resolved Transient Circular Dichroism Spectroscopy Using Synchrotron Natural Polarisation

2019 ◽  
Author(s):  
François Auvray ◽  
David Dennetière ◽  
Alexandre Giuliani ◽  
Frédéric Jamme ◽  
Frank Wien ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Synchrotron Radiation ◽  
Time Resolved ◽  
New Approach ◽  
X Ray Scattering ◽  
Wide Range ◽  
Potential Applications ◽  
Acquisition Speed ◽  
Concentration Changes ◽  
Circular Dichroïsm

<a> </a><p><a></a><a>Ultraviolet (UV) synchrotron radiation circular dichroism (SRCD) spectroscopy has made an important contribution to the determination and understanding of the structure of bio-molecules. In this paper, we report an innovative</a> approach that we term time-resolved SRCD (tr-SRCD), which overcomes the limitations of current broadband UV SRCD setups. This technique allows accessing ultrafast time scales (down to nanoseconds), previously measurable only by other methods, such as infrared (IR), nuclear magnetic resonance (NMR), fluorescence and absorbance spectroscopies and small angle X-ray scattering (SAXS). The tr-SRCD setup takes advantage of the natural polarisation of the synchrotron radiation emitted by a bending magnet to record broadband UV CD faster than any current SRCD setup, improving the acquisition speed from 10 mHz to 130 Hz and the accessible temporal resolution by several orders of magnitude. We illustrate the new approach by following the isomers concentration changes of an azopeptide after a photoisomerisation. This breakthrough in SRCD spectroscopy opens up a wide range of potential applications to the detailed characterisation of biological processes, such as protein folding, protein-ligand binding.<a></a></p>

Measuring the Optical Rotation Angle and Circular Dichroism of Anisotropic Optical Media Using a Heterodyne Polarimeter

2013 ◽  
Vol 31 (8) ◽  
pp. 1255-1262 ◽  
Author(s):  
Yu-Lung Lo ◽  
Chia-Chi Liao ◽  
Chang-Ye Li ◽  
Bo-Sung Shin ◽  
Sang-Mae Lee
Keyword(s):  
Circular Dichroism ◽  
Rotation Angle ◽  
Optical Rotation ◽  
Optical Media ◽  
Circular Dichroïsm
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