5 research outputs found
High-refractive index and mechanically cleavable non-van der Waals InGaS3
The growing families of two-dimensional crystals derived from naturally
occurring van der Waals materials offer an unprecedented platform to
investigate elusive physical phenomena and could be of use in a diverse range
of devices. Of particular interest are recently reported atomic sheets of
non-van der Waals materials, which could allow a better comprehension of the
nature of structural bonds and increase the functionality of prospective
heterostructures. Here, we study the optostructural properties of ultrathin
non-van der Waals InGaS3 sheets produced by standard mechanical cleavage. Our
ab initio calculation results suggest an emergence of authentically delicate
out-of-plane covalent bonds within its unit cell, and, as a consequence, an
artificial generation of layered structure within the material. Those yield to
singular layer isolation energies of around 50 meVA-2, which is comparable with
the conventional van der Waals material's monolayer isolation energies of 20 -
60 meVA-2. In addition, we provide a comprehensive analysis of the structural,
vibrational, and optical properties of the materials presenting that it is a
wide bandgap (2.73 eV) semiconductor with a high-refractive index (higher than
2.5) and negligible losses in the visible and infrared spectral ranges. It
makes it a perfect candidate for further establishment of visible-range
all-dielectric nanophotonics
Exploring van der Waals materials with high anisotropy: geometrical and optical approaches
The emergence of van der Waals (vdW) materials resulted in the discovery of
their giant optical, mechanical, and electronic anisotropic properties,
immediately enabling countless novel phenomena and applications. Such success
inspired an intensive search for the highest possible anisotropic properties
among vdW materials. Furthermore, the identification of the most promising
among the huge family of vdW materials is a challenging quest requiring
innovative approaches. Here, we suggest an easy-to-use method for such a survey
based on the crystallographic geometrical perspective of vdW materials followed
by their optical characterization. Using our approach, we found As2S3 as a
highly anisotropic vdW material. It demonstrates rare giant in-plane optical
anisotropy, high refractive index and transparency in the visible range,
overcoming the century-long record set by rutile. Given these benefits, As2S3
opens a pathway towards next-generation nanophotonics as demonstrated by an
ultrathin true zero-order quarter-waveplate that combines classical and the
Fabry-Perot optical phase accumulations. Hence, our approach provides an
effective and easy-to-use method to find vdW materials with the utmost
anisotropic properties.Comment: 11 pages, 5 figure
The development of a new approach toward lanthanide-based OLED fabrication: new host materials for Tb-based emitters
Exploring van der Waals materials with high anisotropy: geometrical and optical approaches
Abstract The emergence of van der Waals (vdW) materials resulted in the discovery of their high optical, mechanical, and electronic anisotropic properties, immediately enabling countless novel phenomena and applications. Such success inspired an intensive search for the highest possible anisotropic properties among vdW materials. Furthermore, the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative approaches. Here, we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical characterization. Using our approach, we found As2S3 as a highly anisotropic vdW material. It demonstrates high in-plane optical anisotropy that is ~20% larger than for rutile and over two times as large as calcite, high refractive index, and transparency in the visible range, overcoming the century-long record set by rutile. Given these benefits, As2S3 opens a pathway towards next-generation nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase accumulations. Hence, our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties