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Issue 26, 2018

Large birefringence and linear dichroism in TiS3 nanosheets

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Abstract

TiS3 nanosheets have proven to be promising candidates for ultrathin optoelectronic devices due to their direct narrow band-gap and the strong light–matter interaction. In addition, the marked in-plane anisotropy of TiS3 is appealing for the fabrication of polarization sensitive optoelectronic devices. Herein, we study the optical contrast of TiS3 nanosheets of variable thickness on SiO2/Si substrates, from which we obtain the complex refractive index in the visible spectrum. We find that TiS3 exhibits very large birefringence, larger than that of well-known strong birefringent materials like TiO2 or calcite, and linear dichroism. These findings are in qualitative agreement with ab initio calculations that suggest an excitonic origin for the birefringence and linear dichroism of the material.

Graphical abstract: Large birefringence and linear dichroism in TiS3 nanosheets

Supplementary files

Article information


Submitted
03 May 2018
Accepted
13 Jun 2018
First published
14 Jun 2018

Nanoscale, 2018,10, 12424-12429
Article type
Paper

Large birefringence and linear dichroism in TiS3 nanosheets

N. Papadopoulos, R. Frisenda, R. Biele, E. Flores, J. R. Ares, C. Sánchez, H. S. J. van der Zant, I. J. Ferrer, R. D'Agosta and A. Castellanos-Gomez, Nanoscale, 2018, 10, 12424 DOI: 10.1039/C8NR03616K

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