Open AccessVery high contrast volume holographic gratings recorded in photopolymerizable nanocomposite materials
Author(s) -
Yasuo Tomita,
Toshi Aoi,
Shuma Hasegawa,
Feng Xia,
Yueheng Wang,
Juro Oshima
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.400092
Subject(s) - materials science , holography , refractive index , diffraction efficiency , acrylate , polymer , nanoparticle , optics , monomer , embossing , nanocomposite , refractive index contrast , phase (matter) , high refractive index polymer , optoelectronics , grating , diffraction grating , composite material , nanotechnology , fabrication , chemistry , alternative medicine , organic chemistry , pathology , medicine , physics
Volume holographic phase gratings possessing the saturated refractive index modulation amplitudes as large as 4.5×10 -2 were recorded at a wavelength of 532 nm in a photopolymerizable nanoparticle-polymer composite (NPC) film dispersed with ultrahigh refractive index hyperbranched-polymer (HBP) organic nanoparticles. This prominent result was achieved by a combination of the HBP nanoparticles with triazine and aromatic ring units and an electron donor/acceptor photo-initiator system doped in an acrylate monomer blend with low viscosity. As a result, efficient mutual diffusion of HBP nanoparticles and monomer having their very large refractive index difference took place. Obtained results suggest a potentiality of our newly developed HBP-dispersed NPC gratings as efficient volume holographic optical elements for various photonic applications including wearable headsets for augmented and mixed reality.