Journal
NANO LETTERS
Volume 19, Issue 6, Pages 4052-4059Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01442
Keywords
Two-dimensional materials; transition-metal dichalcogenides; nanomechanical resonator; nonlinearity; internal resonance
Categories
Funding
- Army Research Office (ARO) [W911NF1510068]
- NSF MRSEC [DMR-1121262, DMR-1720139]
- Center for Nanoscale Materials (CNM, Argonne National Lab)
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-1542205]
- State of Illinois
- Materials Research Science and Engineering Center (NSF) [DMR-1720139]
- Northwestern University
- Tel-Aviv University Northwestern University
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Nanomechanical resonators make exquisite force sensors due to their small footprint, low dissipation, and high frequencies. Because the lowest resolvable force is limited by ambient thermal noise, resonators are either operated at cryogenic temperatures or coupled to a high-finesse optical or microwave cavity to reach sub aN Hz(-1/2). sensitivity. Here, we show that operating a monolayer WS2 nanoresonator in the strongly nonlinear regime can lead to comparable force sensitivities at room temperature. Cavity interferometry was used to transduce the nonlinear response of the nanoresonator, which was characterized by multiple pairs of 1:1 internal resonance. Some of the modes exhibited exotic line shapes due to the appearance of Hopf bifurcations, where the bifurcation frequency varied linearly with the driving force and forms the basis of the advanced sensing modality. The modality is less sensitive to the measurement bandwidth, limited only by the intrinsic frequency fluctuations, and therefore, advantageous in the detection of weak incoherent forces.
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