POLICRYPS composite structures. Realization, characterization and exploitation for electro-optical and all-optical applications
| Autor: | Roberto Bartolino, Antonio De Luca, Cesare Umeton, Giuseppe Strangi, Luciano De Sio, Alessandro Veltri, Roberto Caputo |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
business.industry Scattering General Chemistry Condensed Matter Physics composite structures diffraction gratings holographic structures liquid crystals optical devices chemistry (all) materials science (all) condensed matter physics Wavelength Optics Liquid crystal Electric field Optoelectronics Light beam General Materials Science business Diffraction grating Refractive index Curing (chemistry) |
| Popis: | The acronym POLICRYPS indicates a nano/micro composite structure made of films of well aligned nematic liquid crystal (NLC) alternated to slices of almost pure polymer. Structures are fabricated by curing a homogeneous mixture of mesogenic material, monomer and a curing agent with UV radiation, under suitable physical and geometrical conditions. In particular, geometrical conditions determine (in the range 0.2 ÷ 15 μ m) the spatial periodicity of the realized sample, which can be utilized for transmitting, diffracting or reflecting an impinging light beam, with negligible scattering losses. The spatial modulation of the refractive index (from polymer to NLC) can be switched ON and OFF both by applying an electric field of few V/μ m or, in some cases, by irradiating the sample with a light beam of suitable wavelength. This electrical/optical tuneability is responsible for a series of distinctive characteristics of the optical effects produced by the structure, and determines the range of possible applicati... |
| Databáze: | OpenAIRE |
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