title: Polarization-dependent optical absorption of MoS₂ for refractive index sensing.
abstract: As a noncentrosymmetric crystal with spin-polarized band structure, MoS2 nanomaterials have attracts increasing attention in many areas such as lithium ion batteries, flexible electronic devices, photoluminescence and valleytronics. The investigation of MoS2 is mainly focused on the electronics and spintronics instead of optics, which restrict its applications as key elements of photonics. In this work, we demonstrate the first observation of the polarization-dependent optical absorption of the MoS2 thin film, which is integrated onto an optical waveguide device. With this feature, a novel optical sensor combining MoS2 thin-film and a microfluidic structure has been constituted to achieve the sensitive monitoring of refractive index. Our work indicates the MoS2 thin film as a complementary material to graphene for the optical polarizer in the visible light range, and explores a new application direction of MoS2 nanomaterials for the construction of photonic circuits.
authors.affiliation: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Tan
authors.affiliation: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Ruiyun
authors.initials: R
authors.lastname: He
authors.affiliation: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Cheng
authors.affiliation: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.affiliation: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Yanxue
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Chen