TY - JOUR
T1 - Thickness-Dependent Refractive Index of 1L, 2L, and 3L MoS
2
, MoSe
2
, WS
2
, and WSe
2
AU - Hsu, Chunwei
AU - Frisenda, Riccardo
AU - Schmidt, Robert
AU - Arora, Ashish
AU - de Vasconcellos, Steffen Michaelis
AU - Bratschitsch, Rudolf
AU - van der Zant, Herre S.J.
AU - Castellanos-Gomez, Andres
PY - 2019
Y1 - 2019
N2 -
An interesting aspect of 2D materials is the change of their electronic structure with the reduction of thickness. Molybdenum and tungsten-based transition metal dichalcogenides form an important family of 2D materials, whose members show a thickness-dependent bandgap and strong light–matter interaction. In this work, the experimental determination of the complex refractive index of 1-, 2-, 3-layer thick MoS
2
, MoSe
2
, WS
2
, and WSe
2
in the range from 400 to 850 nm of the electromagnetic spectrum is reported by using microreflectance spectroscopy and combined with calculations based on the Fresnel equations. It is further provided a comparison with the bulk refractive index values reported in the literature and a discussion of the difference/similarity between our work and the monolayer refractive index available from the literature, finding that the results from different techniques are in good agreement.
AB -
An interesting aspect of 2D materials is the change of their electronic structure with the reduction of thickness. Molybdenum and tungsten-based transition metal dichalcogenides form an important family of 2D materials, whose members show a thickness-dependent bandgap and strong light–matter interaction. In this work, the experimental determination of the complex refractive index of 1-, 2-, 3-layer thick MoS
2
, MoSe
2
, WS
2
, and WSe
2
in the range from 400 to 850 nm of the electromagnetic spectrum is reported by using microreflectance spectroscopy and combined with calculations based on the Fresnel equations. It is further provided a comparison with the bulk refractive index values reported in the literature and a discussion of the difference/similarity between our work and the monolayer refractive index available from the literature, finding that the results from different techniques are in good agreement.
KW - 2D materials
KW - refractive index
KW - thickness-dependent optical properties
KW - transition metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85065427551&partnerID=8YFLogxK
U2 - 10.1002/adom.201900239
DO - 10.1002/adom.201900239
M3 - Article
AN - SCOPUS:85065427551
SN - 2195-1071
VL - 7
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 13
M1 - 1900239
ER -