Application of plasmonic bowtie nanoantenna arrays for optical trapping, stacking, and sorting.
Nano Lett
; 12(2): 796-801, 2012 Feb 08.
Article
in En
| MEDLINE
| ID: mdl-22208881
ABSTRACT
We present the use of Au bowtie nanoantenna arrays (BNAs) for highly efficient, multipurpose particle manipulation with unprecedented low input power and low-numerical aperture (NA) focusing. Optical trapping efficiencies measured are up to 20× the efficiencies of conventional high-NA optical traps and are among the highest reported to date. Empirically obtained plasmonic optical trapping "phase diagrams" are introduced to detail the trapping response of the BNAs as a function of input power, wavelength, polarization, particle diameter, and BNA array spacing (number density). Using these diagrams, parameters are chosen, employing strictly the degrees-of-freedom of the input light, to engineer specific trapping tasks including (1) dexterous, single-particle trapping and manipulation, (2) trapping and manipulation of two- and three-dimensional particle clusters, and (3) particle sorting. The use of low input power densities (power and NA) suggests that this bowtie nanoantenna trapping system will be particularly attractive for lab-on-a-chip technology or biological applications aimed at reducing specimen photodamage.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Nanotechnology
/
Optical Tweezers
/
Optics and Photonics
Language:
En
Journal:
Nano Lett
Year:
2012
Type:
Article
Affiliation country:
United States