Liquid-crystal-based chiral photonic crystals for polarization rotation of complex vector fields

2021 ◽  
Author(s):  
Chun-Wei Chen ◽  
Iam Choon Khoo
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystals ◽  
Vector Fields ◽  
Polarization Rotation ◽  
Complex Vector ◽  
Chiral Photonic Crystals

scholarly journals Optical vector field rotation and switching with near-unity transmission by fully developed chiral photonic crystals

2021 ◽  
Vol 118 (16) ◽  
pp. e2021304118
Author(s):  
Chun-Wei Chen ◽  
Iam Choon Khoo
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
High Performance ◽  
Vector Fields ◽  
Continuous Wave ◽  
Rotatory Power ◽  
Polarization Rotation ◽  
Chiral Photonic Crystals ◽  
Unit Cells ◽  
Size Interaction

State-of-the-art nanostructured chiral photonic crystals (CPCs), metamaterials, and metasurfaces have shown giant optical rotatory power but are generally passive and beset with large optical losses and with inadequate performance due to limited size/interaction length and narrow operation bandwidth. In this work, we demonstrate by detailed theoretical modeling and experiments that a fully developed CPC, one for which the number of unit cells N is high enough that it acquires the full potentials of an ideal (N → ∞) crystal, will overcome the aforementioned limitations, leading to a new generation of versatile high-performance polarization manipulation optics. Such high-N CPCs are realized by field-assisted self-assembly of cholesteric liquid crystals to unprecedented thicknesses not possible with any other means. Characterization studies show that high-N CPCs exhibit broad transmission maxima accompanied by giant rotatory power, thereby enabling large (>π) polarization rotation with near-unity transmission over a large operation bandwidth. Polarization rotation is demonstrated to be independent of input polarization orientation and applies equally well on continuous-wave or ultrafast (picosecond to femtosecond) pulsed lasers of simple or complex (radial, azimuthal) vector fields. Liquid crystal–based CPCs also allow very wide tuning of the operation spectral range and dynamic polarization switching and control possibilities by virtue of several stimuli-induced index or birefringence changing mechanisms.

scholarly journals Strong unique continuation for systems of complex vector fields

2014 ◽  
Vol 138 (4) ◽  
pp. 457-469 ◽  
Author(s):  
R.F. Barostichi ◽  
P.D. Cordaro ◽  
G. Petronilho
Keyword(s):  
Vector Fields ◽  
Unique Continuation ◽  
Complex Vector

On the local solvability of vector fields with critical points

2011 ◽  
Vol 10 (3) ◽  
pp. 785-808
Author(s):  
François Treves
Keyword(s):  
Critical Points ◽  
Vector Fields ◽  
Local Solvability ◽  
Complex Vector ◽  
Base Manifold ◽  
Smooth Complex ◽  
Empty Subset

AbstractThe article discusses the local solvability (or lack thereof) of various classes of smooth, complex vector fields that vanish on some non-empty subset of the base manifold.

Zak phases of chiral photonic crystals designed via transformation optics

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Ting Wai Lau ◽  
Yong-liang Zhang ◽  
Kin Hung Fung
Keyword(s):  
Photonic Crystals ◽  
Transformation Optics ◽  
Chiral Photonic Crystals
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