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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 51, Iss. 11 — Apr. 10, 2012
  • pp: 1688–1693

Palladium bridged gold nanocylinder dimer: plasmonic properties and hydrogen sensitivity

Arindam Dasgupta and G. V. Pavan Kumar  »View Author Affiliations


Applied Optics, Vol. 51, Issue 11, pp. 1688-1693 (2012)
http://dx.doi.org/10.1364/AO.51.001688


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Abstract

Plasmonic nanodimers facilitate electromagnetic hotspots at their gap junction. By loading these gap junctions with nanomaterials, the plasmonic properties of nanodimer can be varied. In this study, we bridged the gap junction of gold (Au) nanocylinder dimer with palladium (Pd), and numerically evaluated the plasmonic properties of the designed nanostructure. We simulated the far-field extinction spectra of Pd bridged Au nanocylinder dimer, and identified the dipole and quadrupole plasmon modes at 839 and 578 nm, respectively. By varying the geometrical parameters of the Pd bridge, we revealed the ability to tune the dipolar plasmon resonance of the bridged dimer. Further, we exploited the hydrogen sensitivity of Pd bridge to harness the bridged-Au dimer as nanoplasmonic hydrogen sensor. Such nano-optical detection platforms have minimal spatial footprint and can be further harnessed for chip-based plasmonic sensing.

© 2012 Optical Society of America

OCIS Codes
(240.6490) Optics at surfaces : Spectroscopy, surface
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

History
Original Manuscript: September 7, 2011
Manuscript Accepted: October 21, 2011
Published: April 5, 2012

Virtual Issues
Vol. 7, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Arindam Dasgupta and G. V. Pavan Kumar, "Palladium bridged gold nanocylinder dimer: plasmonic properties and hydrogen sensitivity," Appl. Opt. 51, 1688-1693 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-11-1688

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