Tunable optical tweezers for wavelength-dependent measurements
Abstract
Optical trapping forces depend on the difference between the trap wavelength and the extinction resonances of trapped particles. This leads to a wavelength-dependent trapping force, which should allow for the optimization of optical tweezers systems, simply by choosing the best trapping wavelength for a given application. Here we present an optical tweezer system with wavelength tunability, for the study of resonance effects. With this system, the optical trap stiffness is measured for single trapped particles that exhibit either single or multiple extinction resonances. We include discussions of wavelength-dependent effects, such as changes in temperature, and how to measure them.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 01, 2012
- Source ID
- 10.1063/1.4704373
Entities
People
- Brooke Hester
- Carlos Lopez-mariscal
- Carly Levin Filgueira
- Gretchen K. Campbell
- Kristian Helmerson
- Naomi J. Halas
- Ryan Huschka
Organizations
- Air Force Office of Scientific Research
- Appalachian State University
- Monash University
- National Institute of Standards and Technology
- National Institutes of Health
- Office of Naval Research
- Rice University
- United States Naval Research Laboratory