Dichroic Electro-Optical Behavior of Rhenium Sulfide Layered Crystal

Ching-Hwa Ho

Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei City.

DOI: 10.4236/csta.2013.22009                

Abstract

Dichroic behaviors of layered ReS₂ have been characterized using angular dependent polarizedabsorption and resistivity measurements in the van der Waal plane. The angular dependent optical and electrical measurements are carried out with angles ranging from θ= 0°(E || b) to θ= 90°(E ^b) with respect to the layer crystal’s b-axis. The angular de pendence of polarized energy gaps of ReS₂ shows a sinusoidal variation of energies from ~1.341 eV (E ||b to ~1.391 eV (E ^ b). The experimental evidence of polarized energy gap leaves ReS₂ apotential usage for fabrication of a polarized optical switch suitable for polarized optical communication in nearinfrared (NIR) region. Angular dependence of resistivities of ReS₂ in the vander Waal plane has also been evaluated. The relationship of inplane resistivities shows a sinusoidallike variation from θ= 0°(E ||b) to 90°(E ^ b) and repeated periodically to 360°. The experimental results of optical and electrical measurements indicated that ReS₂ is not only an opticaldichroic layer but also an electricaldichroism material presented in the layer plane.

Keywords

Triclinic Crystals; Optical Materials; Polarization-Sensitive Devices

Conflicts of Interest

The authors declare no conflicts of interest.

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