Print Email Facebook Twitter Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity Title Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity Author Kirchhof, Jan N. (Freie Universität Berlin) Yu, Yuefeng (Freie Universität Berlin) Yagodkin, Denis (Freie Universität Berlin) Stetzuhn, Nele (Freie Universität Berlin; Max-Born-Institute) de Araújo, Daniel B. (Freie Universität Berlin) Kanellopulos, Kostas (Technische Universität Wien) Mañas Valero, S. (TU Delft QN/vanderSarlab; Universidad de Valencia (ICMol); Kavli institute of nanoscience Delft) Coronado, Eugenio (Universidad de Valencia (ICMol)) van der Zant, H.S.J. (TU Delft QN/van der Zant Lab; Kavli institute of nanoscience Delft) Date 2023 Abstract Nanomechanical spectroscopy (NMS) is a recently developed approach to determine optical absorption spectra of nanoscale materials via mechanical measurements. It is based on measuring changes in the resonance frequency of a membrane resonator vs. the photon energy of incoming light. This method is a direct measurement of absorption, which has practical advantages compared to common optical spectroscopy approaches. In the case of two-dimensional (2D) materials, NMS overcomes limitations inherent to conventional optical methods, such as the complications associated with measurements at high magnetic fields and low temperatures. In this work, we develop a protocol for NMS of 2D materials that yields two orders of magnitude improved sensitivity compared to previous approaches, while being simpler to use. To this end, we use mechanical sample actuation, which simplifies the experiment and provides a reliable calibration for greater accuracy. Additionally, the use of low-stress silicon nitride membranes as our substrate reduces the noise-equivalent power to NEP = 890 fW H z − 1 , comparable to commercial semiconductor photodetectors. We use our approach to spectroscopically characterize a 2D transition metal dichalcogenide (WS2), a layered magnetic semiconductor (CrPS4), and a plasmonic super-crystal consisting of gold nanoparticles. Subject 2D materialsnanomechanical resonatorsNEMSresonatorsilicon nitridespectroscopytransition metal dichalcogenides (TMDs) To reference this document use: http://resolver.tudelft.nl/uuid:f9daacaf-4c01-40e2-8ee4-85e7173b2f53 DOI https://doi.org/10.1088/2053-1583/acd0bf ISSN 2053-1583 Source 2D Materials, 10 (3) Part of collection Institutional Repository Document type journal article Rights © 2023 Jan N. Kirchhof, Yuefeng Yu, Denis Yagodkin, Nele Stetzuhn, Daniel B. de Araújo, Kostas Kanellopulos, S. Mañas Valero, Eugenio Coronado, H.S.J. van der Zant, More Authors Files PDF Kirchhof_2023_2D_Mater._1 ... 035012.pdf 953.24 KB Close viewer /islandora/object/uuid:f9daacaf-4c01-40e2-8ee4-85e7173b2f53/datastream/OBJ/view