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Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity

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Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity

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dc.contributor.author Mañas Valero, Samuel
dc.contributor.author Van der Zant, H. S. J.
dc.contributor.author Coronado Miralles, Eugenio
dc.date.accessioned 2023-10-20T13:21:14Z
dc.date.available 2023-10-20T13:21:14Z
dc.date.issued 2023
dc.identifier.uri https://hdl.handle.net/10550/90514
dc.description.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 $\textrm {NEP} = 890$ fW $\sqrt{\mathrm{Hz}}^{-1}$, 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.
dc.language.iso eng
dc.relation.ispartof 2d Materials, 2023, vol. 10, num. 3, p. 035012
dc.source Mañas Valero, Samuel Van der Zant, H. S. J. Coronado Miralles, Eugenio 2023 Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity 2d Materials 10 3 035012
dc.subject Materials
dc.subject Química
dc.title Nanomechanical absorption spectroscopy of 2D materials with femtowatt sensitivity
dc.type journal article
dc.date.updated 2023-10-20T13:21:14Z
dc.identifier.doi 10.1088/2053-1583/acd0bf
dc.identifier.idgrec 160455
dc.rights.accessRights open access

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