Nanofiber near-field light-matter interactions for enhanced detection of molecular level displacements and dynamics

Ilsun Yoon, Sarah E. Baker, Kanguk Kim, Nicholas O. Fischer, Daniel Heineck, Yinmin Wang, Sadik Esener, Donald J. Sirbuly

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We experimentally demonstrate that plasmonic nanoparticles embedded in the evanescent field of subwavelength optical waveguides (WGs) are highly sensitive to distances normal to the propagation of light, showing an ∼10× increase in spatial resolution compared to the optical field decay of the WG. The scattering cross-section of the Au nanoparticle is increased by the plasmon-dielectric coupling interaction when the nanoparticle is placed near the dielectric surface of the WG, and the decay of the scattering signal is enhanced, showing angstrom level distance sensitivity within 10 nm from the WG. Numerical studies with the finite-difference time-domain (FDTD) method correlate well with the experimental results. To demonstrate real-time monitoring of a single molecule stretching in the evanescent field, we linked individual single-stranded DNA molecules between the WG and plasmonic nanoparticles and pushed on the nanoparticles with fluidic forces. The simple design and ease of obtaining optical feedback on molecular displacements makes our approach ideal for new in situ force sensing devices, imaging technologies, and high-throughput molecular analysis.

Original languageEnglish (US)
Pages (from-to)1440-1445
Number of pages6
JournalNano Letters
Volume13
Issue number4
DOIs
StatePublished - Apr 10 2013
Externally publishedYes

Fingerprint

Nanofibers
Nanoparticles
near fields
Light
Waveguides
nanoparticles
waveguides
Evanescent fields
interactions
Scattering
Optical feedback
Molecules
Single-Stranded DNA
fluidics
Finite difference time domain method
Fluidics
Optical waveguides
decay
finite difference time domain method
optical waveguides

Keywords

  • light-matter interaction
  • molecular ruler
  • Nanophotonics
  • plasmonic nanoparticle
  • sensor
  • subwavelength nanowire

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering
  • Medicine(all)

Cite this

Yoon, I., Baker, S. E., Kim, K., Fischer, N. O., Heineck, D., Wang, Y., ... Sirbuly, D. J. (2013). Nanofiber near-field light-matter interactions for enhanced detection of molecular level displacements and dynamics. Nano Letters, 13(4), 1440-1445. https://doi.org/10.1021/nl3043085

Nanofiber near-field light-matter interactions for enhanced detection of molecular level displacements and dynamics. / Yoon, Ilsun; Baker, Sarah E.; Kim, Kanguk; Fischer, Nicholas O.; Heineck, Daniel; Wang, Yinmin; Esener, Sadik; Sirbuly, Donald J.

In: Nano Letters, Vol. 13, No. 4, 10.04.2013, p. 1440-1445.

Research output: Contribution to journalArticle

Yoon, I, Baker, SE, Kim, K, Fischer, NO, Heineck, D, Wang, Y, Esener, S & Sirbuly, DJ 2013, 'Nanofiber near-field light-matter interactions for enhanced detection of molecular level displacements and dynamics', Nano Letters, vol. 13, no. 4, pp. 1440-1445. https://doi.org/10.1021/nl3043085
Yoon, Ilsun ; Baker, Sarah E. ; Kim, Kanguk ; Fischer, Nicholas O. ; Heineck, Daniel ; Wang, Yinmin ; Esener, Sadik ; Sirbuly, Donald J. / Nanofiber near-field light-matter interactions for enhanced detection of molecular level displacements and dynamics. In: Nano Letters. 2013 ; Vol. 13, No. 4. pp. 1440-1445.
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