Dynamic near-field optical interaction between oscillating nanomechanical structures

Phillip Ahn, Xiang Chen, Zhen Zhang, Matthew Ford, Daniel Rosenmann, Il Woong Jung, Cheng Sun, Oluwaseyi Balogun

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Near-field optical techniques exploit light-matter interactions at small length scales for mechanical sensing and actuation of nanomechanical structures. Here, we study the optical interaction between two mechanical oscillators - a plasmonic nanofocusing probe-tip supported by a low frequency cantilever, and a high frequency nanomechanical resonator - and leverage their interaction for local detection of mechanical vibrations. The plasmonic nanofocusing probe provides a confined optical source to enhance the interaction between the two oscillators. Dynamic perturbation of the optical cavity between the probe-tip and the resonator leads to nonlinear modulation of the scattered light intensity at the sum and difference of their frequencies. This double-frequency demodulation scheme is explored to suppress unwanted background and to detect mechanical vibrations with a minimum detectable displacement sensitivity of 0.45 pm/Hz1/2, which is limited by shot noise and electrical noise. We explore the demodulation scheme for imaging the bending vibration mode shape of the resonator with a lateral spatial resolution of 20 nm. We also demonstrate the time-resolved aspect of the local optical interaction by recording the ring-down vibrations of the resonator at frequencies of up to 129 MHz. The near-field optical technique is promising for studying dynamic mechanical processes in individual nanostructures.

Original languageEnglish (US)
Article number10058
JournalScientific reports
Volume5
DOIs
StatePublished - May 27 2015
Externally publishedYes

Fingerprint

near fields
resonators
demodulation
vibration
interactions
probes
mechanical oscillators
bending vibration
modal response
shot noise
actuation
luminous intensity
vibration mode
spatial resolution
recording
oscillators
low frequencies
modulation
perturbation
cavities

ASJC Scopus subject areas

  • General

Cite this

Ahn, P., Chen, X., Zhang, Z., Ford, M., Rosenmann, D., Jung, I. W., ... Balogun, O. (2015). Dynamic near-field optical interaction between oscillating nanomechanical structures. Scientific reports, 5, [10058]. https://doi.org/10.1038/srep10058

Dynamic near-field optical interaction between oscillating nanomechanical structures. / Ahn, Phillip; Chen, Xiang; Zhang, Zhen; Ford, Matthew; Rosenmann, Daniel; Jung, Il Woong; Sun, Cheng; Balogun, Oluwaseyi.

In: Scientific reports, Vol. 5, 10058, 27.05.2015.

Research output: Contribution to journalArticle

Ahn, P, Chen, X, Zhang, Z, Ford, M, Rosenmann, D, Jung, IW, Sun, C & Balogun, O 2015, 'Dynamic near-field optical interaction between oscillating nanomechanical structures', Scientific reports, vol. 5, 10058. https://doi.org/10.1038/srep10058
Ahn, Phillip ; Chen, Xiang ; Zhang, Zhen ; Ford, Matthew ; Rosenmann, Daniel ; Jung, Il Woong ; Sun, Cheng ; Balogun, Oluwaseyi. / Dynamic near-field optical interaction between oscillating nanomechanical structures. In: Scientific reports. 2015 ; Vol. 5.
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