Optical trapping and sensing with plasmonic dipole antennas

Weihua Zhang; Olivier J. F. Martin

doi:10.1117/12.864225

10 September 2010 Optical trapping and sensing with plasmonic dipole antennas

Weihua Zhang, Olivier J. F. Martin

Proceedings Volume 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII; 775712 (2010) https://doi.org/10.1117/12.864225
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

In this work, we study how to use a plasmonic dipole antenna as a multifunctional nanodevice for surface-enhanced Raman spectroscopy (SERS), localized surface plasmon resonance (LSPR) -based sensing and optical trapping. An analytical model is implemented to link the local electric field enhancement with the gradient forces, as well as the resonance shift caused by the presence of the analyte which can be a molecule or a nanoparticle. We find that a higher local field enhancement induces stronger trapping forces and a larger resonance wavelength shift. Experiments were also performed using plasmonic dipole antennas. Strong SERS signals were observed from the nanogap of an antenna, trapping of Au nanoparticles as small as 10 nm was achieved with a moderate laser power, and evident resonance shifts of the antenna associated with the trapping events were also observed. These results are consistent with our theoretical result that the giant field enhancement generated by a plasmonic dipole antenna also generates strong gradient forces and a high spectral sensitivity.

Citation Download Citation

Weihua Zhang and Olivier J. F. Martin "Optical trapping and sensing with plasmonic dipole antennas", Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 775712 (10 September 2010); https://doi.org/10.1117/12.864225

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available