Optical diffractometry of anisotropic holographic structure composed of liquid crystal and polymer phases with extended Bragg modes

Kakiuchida, Hiroshi; Tazawa, Masato; Yoshimura, Kazuyoshi; Ogiwara, Akifumi

doi:10.1016/j.tsf.2013.11.050

Cited by 6 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6,7 Two-wave coupled wave theory, an extension of the Kogelnik’s theory developed for analyzing particularly thick HPDLC gratings, 8−11 accounts accurately for the individual p- and s-polarization components in the Bragg diffractions, that is, the polarizations parallel and perpendicular to the plane containing the incident and diffracted rays, respectively. 12,13…”

Section: Introductionmentioning

confidence: 99%

“…An essential property of HPDLCs is the ability to produce Bragg diffraction with a strong optical polarization, resulting from the orientation ordering of the LC molecules in the droplets. Coupled wave theory, an established general theoretical framework for analyzing thick optical gratings first described by Kogelnik, is based on scalar wave equations in electromagnetic wave optics. , Two-wave coupled wave theory, an extension of the Kogelnik’s theory developed for analyzing particularly thick HPDLC gratings, − accounts accurately for the individual p- and s-polarization components in the Bragg diffractions, that is, the polarizations parallel and perpendicular to the plane containing the incident and diffracted rays, respectively. , …”

Section: Introductionmentioning

confidence: 99%

“…6,7 Two-wave coupled wave theory, an extension of the Kogelnik's theory developed for analyzing particularly thick HPDLC gratings, 8−11 to the plane containing the incident and diffracted rays, respectively. 12,13 HPDLCs can be formed through PPIPS, achieved by a spatially periodic intensity modulation during holographic or interferential exposure. Linearly polarized Bragg diffraction is produced by the orientation ordering of LC molecules, which is uniaxial along the grating vector and can be switched by applying an electric field.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multiple Bragg Diffractions with Different Wavelengths and Polarizations Composed of Liquid Crystal/Polymer Periodic Phases

Kakiuchida¹,

Ogiwara

Matsuyama

2017

ACS Omega

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiple Bragg Diffractions with Different Wavelengths and Polarizations Composed of Liquid Crystal/Polymer Periodic Phases

Kakiuchida¹,

Ogiwara

Matsuyama

2017

ACS Omega

View full text Add to dashboard Cite

show abstract

Stimuli‐Responsive Light‐Diffusing Polarizers Self‐Assembled of Liquid Crystals and Polymers

Kakiuchida,

Ogiwara

2024

Advanced Optical Materials

View full text Add to dashboard Cite

Light‐diffusing polarizers of liquid crystal (LC)/polymer composites are fabricated via a self‐assembly process. The transmittance has a polarization extinction ratio more than ten and is controlled electro‐ or thermo‐responsively. Such stimuli responsiveness results from unidirectionally oriented, highly rotatable LCs existing in LC‐rich domains. The polarizers are photoinduced self‐organizable, electro‐driven controllable, and wavelength adjustable. The structures comprise (sub) micrometer‐long, narrow domains of LC and isotropic polymer phases, and some LCs are oriented perpendicular to the domain boundaries. Such LC orientation becomes self‐assembly ordered through photopolymerization‐induced phase separation (PPIPS), performed by nonuniform photoirradiation with direct or Fourier‐transformed speckle‐pattern projection. The polarization extinction ratio of light diffusion increases, as the compositional ratio of urethane prepolymers increases or the photoirradiation becomes more intense. LCs are found to be oriented more uniaxially in the LC‐richer (polymer‐poorer) phases. The uniaxially oriented LCs contribute to the optical polarization of light diffusion. The electro‐response time of polarization change is the order of 100 ms and microscopically caused by LC reorientation behavior in LC‐rich domains among open polymer networks. Two different light‐source wavelengths can be chosen for PPIPS by adjusting photoinitiators. The light‐diffusing polarizers extend photonic application range from the points of view of users and manufacturers.

show abstract

Introduction to Liquid Crystalline Polymers

Pavel

2016

Liquid Crystalline Polymers

View full text Add to dashboard Cite

Optical diffractometry of anisotropic holographic structure composed of liquid crystal and polymer phases with extended Bragg modes

Cited by 6 publications

References 28 publications

Multiple Bragg Diffractions with Different Wavelengths and Polarizations Composed of Liquid Crystal/Polymer Periodic Phases

Multiple Bragg Diffractions with Different Wavelengths and Polarizations Composed of Liquid Crystal/Polymer Periodic Phases

Stimuli‐Responsive Light‐Diffusing Polarizers Self‐Assembled of Liquid Crystals and Polymers

Introduction to Liquid Crystalline Polymers

Contact Info

Product

Resources

About