Multiple Bragg Diffractions with Different Wavelengths and Polarizations Composed of Liquid Crystal/Polymer Periodic Phases
| Autor: | Akifumi Ogiwara, Hiroshi Kakiuchida, Akihiko Matsuyama |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Fabrication General Chemical Engineering Holography 02 engineering and technology 01 natural sciences Article law.invention lcsh:Chemistry 010309 optics chemistry.chemical_compound Optics Liquid crystal law 0103 physical sciences Prepolymer chemistry.chemical_classification business.industry General Chemistry Polymer 021001 nanoscience & nanotechnology Polarization (waves) Wavelength Monomer lcsh:QD1-999 chemistry 0210 nano-technology business |
| Zdroj: | ACS Omega, Vol 2, Iss 9, Pp 6081-6090 (2017) ACS Omega |
| ISSN: | 2470-1343 |
| DOI: | 10.1021/acsomega.7b01149 |
| Popis: | We first fabricated holographic polymer-dispersed liquid crystals (HPDLCs) that produce multiple Bragg diffractions with different polarization states for every angle of incidence, through a photopolymerization-induced phase separation by one-time interferential exposure. The polarizations of the Bragg diffractions were well-controlled at individual wavelengths in the fabrication process by the compositional ratio of LCs to monomers. The raw mixtures of extremely low-functionality monomers having very different viscosities were used to reduce the domain size in phase separation and subsequently to form elaborate periodic structures of the LC and polymer phases. A cross-linker (1-vinyl-2-pyrrolidione) and a prepolymer with urethane groups were employed to strengthen the polymer network. Note that the diffractions of our HPDLCs are regarded as not purely but mostly Bragg type, according to the evaluation with the established criteria. The devices, which are monolithic but versatile in diffractive behaviors, have advantages of simple manufacturing and handling. |
| Databáze: | OpenAIRE |
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