Stamping of Naked and Suspended 2D Materials to Engineer Light Absorption

We present a nitrocellulose-based method to manipulate naked and suspended 2DM one by one. We make optical measurements on several heterostructures to demonstrate the ability to tune graphene light absorption by a factor of 20. We show spatially-deterministic micron-scale positioning of graphene, boron nitride, and MoS₂ naked crystals. Raman spectroscopy confirms the low defect density introduced upon transfer. We detail micro-Raman measurements on a suspended graphene heterostructure of about 12 µm² to test the validity of an exclusive absorption model based on first-principles calculations [1]. We build several other graphene heterostructures with 2 distinct geometries to engineer the exclusive graphene light absorption. Future applications include optical transducers where a small gate voltage moves a suspended 2DM to vastly enhance or suppress its exclusive light absorption.
[1] H. Song, et al., Optics Express 23, 7120 (2015)