Liquid crystalline nonlinear optical metamaterials with low-loss tunable negative-zero-positive refractive indices

2007 ◽  
Author(s):  
I. C. Khoo ◽  
A. Diaz ◽  
D.-H. Kwon ◽  
D. H. Werner
Keyword(s):  
Liquid Crystalline ◽  
Nonlinear Optical ◽  
Refractive Indices ◽  
Low Loss ◽  
Optical Metamaterials

DESIGN AND TRANSMISSION-REFLECTION PROPERTIES OF LIQUID CRYSTALLINE OPTICAL METAMATERIALS WITH LARGE BIREFRINGENCE AND SUB-UNITY OR NEGATIVE-REFRACTIVE INDEX

2007 ◽  
Vol 16 (04) ◽  
pp. 533-549 ◽  
Author(s):  
A. DIAZ ◽  
J. H. PARK ◽  
I. C. KHOO
Keyword(s):  
Liquid Crystalline ◽  
Negative Refractive Index ◽  
Refractive Indices ◽  
Reflection And Transmission ◽  
Optical Metamaterials ◽  
Transmission Properties ◽  
Unique Reflection ◽  
Wide Range ◽  
Microwave Regime ◽  
Dispersion Of Nanoparticles

The dispersion of nanoparticles in a nematic liquid crystal host medium provides an efficient way of designing tunable optical metamaterials that respond from the visible to the Terahertz and microwave regime. As studied in this article, these systems exhibit much larger birefringence than the nematic host and possess sub-unity, zero, and even negative refractive indices with unique reflection and transmission properties. These tunable optical metamaterials will enable a wide range of application possibilities in next-generation reflective, transmissive, modulation and switching elements and devices.

scholarly journals Nonlinear optical response of low loss silicon germanium waveguides in the mid-infrared

2015 ◽  
Vol 23 (7) ◽  
pp. 8261 ◽  
Author(s):  
L. Carletti ◽  
P. Ma ◽  
Y. Yu ◽  
B. Luther-Davies ◽  
D. Hudson ◽  
...  
Keyword(s):  
Silicon Germanium ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Low Loss ◽  
Mid Infrared

Submicrometer-Thick Low-Loss As$_2$S$_3$ Planar Waveguides for Nonlinear Optical Devices

2010 ◽  
Vol 22 (7) ◽  
pp. 495-497 ◽  
Author(s):  
D-Y. Choi ◽  
S. Madden ◽  
D. A. Bulla ◽  
R. Wang ◽  
A. Rode ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Devices ◽  
Planar Waveguides ◽  
Low Loss ◽  
Nonlinear Optical Devices

Synthesis and Mesomorphic Properties of New Liquid Crystalline Cyclohexyl-phenyl- and Dicyclohexyl-pyrimidines

1979 ◽  
Vol 34 (11) ◽  
pp. 1535-1541 ◽  
Author(s):  
Alois Villiger ◽  
Arthur Boiler ◽  
Martin Schadt
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Viscosity Reduction ◽  
Refractive Indices ◽  
Thermal Compatibility ◽  
Chain Lengths ◽  
New Compounds ◽  
Mesomorphic Properties ◽  
End Group

Abstract Liquid Crystals, Cyclohexyl-phenyl-pyrimidines, Dicyclohexyl-pyrimidines The synthesis and mesomorphic properties of three new classes of cyano-substituted cyclohexyl-phenyl-and dicyclohexyl-pyrimidines are reported. The compounds are colourless, chemically and photochemically stable and have wide nematic mesophases. The thermal compatibility of the new compounds with other nematic liquid crystals is excellent. The large static positive dielectric anisotropics are shown to depend strongly on the position and number of hydrogenated rings as well as on the alkyl chain lengths within a homologous series. The reported bulk viscosities vary considerably among homologues. Hydrogenating the ring adjacent to the cyano end group causes η to increase, whereas a considerable viscosity reduction compared to nonhydrogenated homologues was found by hydrogenating the ring adjacent to the alkyl end group. The measured refractive indices of the new compounds are comparable to those of biphenyls.

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