optically active material

2011 ◽  
Keyword(s):  
Active Material ◽  
Optically Active ◽  
Optically Active Material

Plasmonic Biofoam: A Versatile Optically Active Material

Nano Letters ◽  
2015 ◽  
Vol 16 (1) ◽  
pp. 609-616 ◽  
Author(s):  
Limei Tian ◽  
Jingyi Luan ◽  
Keng-Ku Liu ◽  
Qisheng Jiang ◽  
Sirimuvva Tadepalli ◽  
...  
Keyword(s):  
Active Material ◽  
Optically Active ◽  
Optically Active Material

Critical Pitch in Thin Cholesteric Films with Homeotropic Boundaries

1976 ◽  
Vol 31 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Fred Fischer
Keyword(s):  
General Solution ◽  
Active Material ◽  
Film Plane ◽  
Optically Active ◽  
Critical Voltage ◽  
Director Field ◽  
Planar Texture ◽  
Normal Orientation ◽  
Additional Influence ◽  
Optically Active Material

Calculations of the planar cholesteric texture with homeotropic boundary conditions are presented. At a constant film thickness there is a critical twist t0c below which the planar texture has transformed into a homeotropic one. The additional influence of an external field is discussed for positive and negative anisotropy and with field orientations parallel or normal to the film plane. A general solution of the director field has been found for a normal orientation of the field. A properly adjusted twist t0 obtained by dilution of an optically active material in a nematic matrix opens a possibility to reduce the critical voltage in technical devices.

optically active material

2000 ◽  
pp. 1177-1177
Author(s):  
Martin H. Weik
Keyword(s):  
Active Material ◽  
Optically Active ◽  
Optically Active Material

ELECTRO-OPTIC AND ELECTRO-GYRATION EFFECTS IN CHIRAL MOLECULAR SYSTEMS

2004 ◽  
Vol 13 (03n04) ◽  
pp. 397-404 ◽  
Author(s):  
AHYOUNG KIM ◽  
J. W. WU ◽  
S. H. HAN ◽  
BYOUNGCHOO PARK ◽  
HIDEO TAKEZOE
Keyword(s):  
Liquid Crystalline ◽  
Superposition Principle ◽  
Active Material ◽  
Rotatory Power ◽  
Optically Active ◽  
Molecular Systems ◽  
Optical Responses ◽  
Electro Optic ◽  
Material Systems ◽  
Optically Active Material

The linear electro-optic (EO) and electro-gyration (EG) effects are studied in an optically active material systems including Bi 12 SiO 20 (BSO) oxide and bent-core liquid crystals. In an isotropic BSO sample, the breaking of intrinsic centro-symmetry allowed the EO modulation of the refractive index. In a mixture of bent-shaped liquid crystalline molecules having both optical activity and birefringence, the observed intensity modulation is investigated, which is related to the nonlinear optical responses of both the optical rotatory power and the birefringence. Both the linear EO and EG effects are understood in terms of the superposition principle of linear and circular birefringences.

Influence of Magnetic Field on Level of Linearly Polarized Laser Beam Passing through Faraday Crystal

2021 ◽  
Vol 408 ◽  
pp. 129-140
Author(s):  
Samer H. Zyoud ◽  
Atef Abdelkader ◽  
Ahed H. Zyoud ◽  
Araa Mebdir Holi
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Laser Beam ◽  
Active Material ◽  
Polarized Light ◽  
Linearly Polarized ◽  
Physical Effects ◽  
Pass Through ◽  
Polarization Level ◽  
Optically Active Material

Many natural materials have the ability to rotate the polarization level of linearly polarized laser beam and pass through it. This phenomenon is called optical activity. In the event that a light beam (linearly polarized) passes through an optically active material, such as a quartz crystal, and projected vertically on the optical axis, the output beam will be polarized equatorially, and the vibration level will rotate at a certain angle [1], [2], [3]. A number of crystals, liquids, solutions, and vapors rotate the electric field of linearly polarized light that passes through them [4], [5], [6], [7]. Many different physical effects are applied to optical isotropic and transparent materials that cause them to behave as optical active materials, where they are able to rotate the polarization level of the polarized light linearly and pass through it [8], [9], [10]. These effects include mechanical strength, electric field, and magnetic field. By placing one of these effects on an optically transparent medium, it changes the behavior of the light travelling through it [11].

scholarly journals Electromagnetic controllable surfaces based on trapped-mode effect

2012 ◽  
Vol 1 (2) ◽  
pp. 89 ◽  
Author(s):  
V. Dmitriev ◽  
S. Prosvirnin ◽  
V. R. Tuz ◽  
M. N. Kawakatsu
Keyword(s):  
Active Material ◽  
Optical Excitation ◽  
Optically Active ◽  
Periodic Cell ◽  
Trapped Mode ◽  
Periodic Arrays ◽  
External Static Magnetic Field ◽  
Metallic Inclusions ◽  
Theoretical Investigations ◽  
Mode Effect

In this paper we present some recent results of our theoretical investigations of electromagnetically controllable surfaces. These surfaces are designed on the basis of periodic arrays made of metallic inclusions of special form which are placed on a thin substrate of active material (magnetized ferrite or optically active semiconductor). The main peculiarity of the studied structures is their capability to support the trapped-mode resonance which is a result of the antiphase current oscillations in the elements of a periodic cell. Several effects, namely: tuning the position of passband and the linear and nonlinear (bistable) transmission switching are considered when an external static magnetic field or optical excitation are applied. Our numerical calculations are fulfilled in both microwave and optical regions.

Amorphous Silicon as an Active Material in Optical Resonators

2006 ◽  
Vol 910 ◽  
Author(s):  
Dennis Hohlfeld ◽  
Hans Zappe
Keyword(s):  
Amorphous Silicon ◽  
Communication Networks ◽  
Gas Sensing ◽  
Active Material ◽  
Data Communication ◽  
Optical Filters ◽  
Interference Filter ◽  
Optical Data ◽  
Silicon Based ◽  
Optically Active Material

AbstractThe application of amorphous silicon as a thermo-optically active material in MEMS-based, tunable optical filters is presented. The thin film interference filter employs a solid-state silicon cavity and silicon-based distributed Bragg reflectors (DBR). Tuning is achieved by varying the the resonator's refractive index and thus its optical thickness through thermal modulation. The filter is configured as a membrane and operates up to a temperature of 450 °C. Such a filter is essential for monitoring and reconfiguration of optical data communication networks and is also applicable for chemical and gas sensing.

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