scholarly journals Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism

2018 ◽  
Vol 6 (14) ◽  
pp. 1800153 ◽  
Author(s):  
Joel T. Collins ◽  
Xuezhi Zheng ◽  
Nuno V. S. Braz ◽  
Eli Slenders ◽  
Shuai Zu ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Plasmonic Nanostructures ◽  
Sign Reversal ◽  
Circular Dichroïsm

Circular Dichroism Studies on Plasmonic Nanostructures

Small ◽  
2016 ◽  
Vol 13 (1) ◽  
pp. 1601115 ◽  
Author(s):  
Xiaoli Wang ◽  
Zhiyong Tang
Keyword(s):  
Circular Dichroism ◽  
Plasmonic Nanostructures ◽  
Circular Dichroïsm

scholarly journals Circular Dichroism of Chromopeptides from Phycocyanin

1983 ◽  
Vol 38 (11-12) ◽  
pp. 951-959 ◽  
Author(s):  
C. Schamagl ◽  
E. Köst-Reyes ◽  
S. Schneider ◽  
H.-P. Köst ◽  
H. Scheer
Keyword(s):  
Circular Dichroism ◽  
Aqueous Solutions ◽  
Optical Activity ◽  
Ph Dependence ◽  
Acidic Ph ◽  
Sign Reversal ◽  
Aqueous Buffer ◽  
Ph Dependent ◽  
Circular Dichroïsm

The circular dichroism of bilipeptides from Spirulina geitleri phycocyanin is strongly solvent and pH dependent. Maximum optical activity has been observed in aqueous solutions containing urea (8 ᴍ). In aqueous buffer, a sign reversal occurred upon the change from neutral to acidic pH; in methanolic solutions shows the optical activity a strong pH dependence both with respect to sign and magnitude. These findings have been rationalized by the presence of chrom ophorepeptide interactions, which are minimized in the presence of urea. M olecular orbital calculations indicate that the observed sign reversal is not necessarily due to a reversal of the chirality of the entire chromophore, but may also result from more localized conform ational changes

Circular extinction of plasmonic silver nanocaps and gas sensing

2016 ◽  
Vol 186 ◽  
pp. 345-352 ◽  
Author(s):  
Jun Li ◽  
Nicholas. A. Kotov
Keyword(s):  
Circular Dichroism ◽  
Structural Control ◽  
Gas Sensing ◽  
Metallic Silver ◽  
Subwavelength Structures ◽  
Plasmonic Nanostructures ◽  
Electromagnetic Spectrum ◽  
Silver Deposition ◽  
Plasmonic Materials ◽  
Circular Dichroïsm

Chiral plasmonic nanostructures exhibit strong rotatory optical activity and are expected to enrich the field of metaoptical materials. Potential applications of chiroplasmonic nanostructures include circular polarizers, optical polarization detectors, asymmetric catalysts, and sensors. However, chiral plasmonic materials require subwavelength structural control and involve laborious chemical or lithographic procedures for their manufacturing. Moreover, strong rotatory activity of subwavelength structures whose chirality was imparted by microfabrication, has been obtained for the red and infrared parts of the spectrum but faces new challenges for the blue and violet spectral ranges even with plasmonic materials with plasmonic bands in the 200–400 nm window. In this study, we address this problem by preparing chiral subwavelength nanostructures by glancing angle sputtering of metallic silver on ZnO nanopillar arrays. Silver deposition in two different planes is a convenient method for preparation of silver chiroplasmonic nanocaps (Ag CPNCs) with controlled asymmetry. Circular dichroism spectroscopy was used to examine the circular extinction for the left-handed nanocaps (L-CPNCs) with understanding that not only circular dichroism but also many other optical effects contribute to the amplitude of these bands. The pillared silver films exhibit circular extinction in the violet area of the electromagnetic spectrum. Partial oxidation of Ag to AgxO causes the absorption and corresponding circular extinction band obtained using a conventional CD spectrometer at 400–525 nm to increase and shift. This optical material may be used to detect oxygen and extends the spectrum of application of chiroplasmonic materials to gas sensing.

scholarly journals Ultra-sensitive amplitude engineering and sign reversal of circular dichroism in quasi-3D chiral nanostructures

2021 ◽  
Author(s):  
Wei Wei ◽  
Shanshan Chen ◽  
Chang-Yin Ji ◽  
Shuqi Qiao ◽  
Honglian Guo ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Sign Reversal ◽  
Chiral Nanostructures ◽  
Circular Dichroïsm

scholarly journals Dynamic tuning of enhanced intrinsic circular dichroism in plasmonic stereo-metamolecule array with surface lattice resonance

Nanophotonics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 3419-3434 ◽  
Author(s):  
Shao-Ding Liu ◽  
Jun-Yan Liu ◽  
Zhaolong Cao ◽  
Jin-Li Fan ◽  
Dangyuan Lei
Keyword(s):  
Circular Dichroism ◽  
High Performance ◽  
Light Field ◽  
Matching Condition ◽  
Plasmonic Nanostructures ◽  
Periodic Arrays ◽  
Dynamic Tuning ◽  
Surface Lattice ◽  
Index Matching ◽  
Circular Dichroïsm

AbstractEnhancing the circular dichroism signals of chiral plasmonic nanostructures is vital for realizing miniaturized functional chiroptical devices, such as ultrathin wave plates and high-performance chiral biosensors. Rationally assembling individual plasmonic metamolecules into coupled nanoclusters or periodic arrays provides an extra degree of freedom to effectively manipulate and leverage the intrinsic circular dichroism of the constituent structures. Here, we show that sophisticated manipulation over the geometric parameters of a plasmonic stereo-metamolecule array enables selective excitation of its surface lattice resonance mode either by left- or right-handed circularly polarized incidence through diffraction coupling, which can significantly amplify the differential absorption and hence the intrinsic circular dichroism. In particular, since the diffraction coupling requires no index-matching condition and its handedness can be switched by manipulating the refractive index of either the superstrate or the substrate, it is therefore possible to achieve dynamic tuning and active control of the intrinsic circular dichroism response without the need of modifying structure parameters. Our proposed system provides a versatile platform for ultrasensitive chiral plasmonics biosensing and light field manipulation.

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