Abstract
We present an experimental technique allowing size-based all-optical sorting of gold nanoparticles. The technique is based on the red-shift of plasmon resonance, due to retardation effects, with increasing particle size. As a result, smaller gold nanoparticles are influenced strongly by shorter wavelengths whereas larger gold nanoparticles are influenced more strongly by longer wavelengths. We utilise this retardation effect and realize sorting in a system of two counter-propagating evanescent waves, each at different wavelengths that selectively guide nanoparticles of different sizes in opposite directions. We validate this concept by demonstrating bidirectional sorting of gold nanoparticles of either 150 or 130 nm in diameter from those of 100 nm in diameter within a mixture.
Original language | English |
---|---|
Title of host publication | Optical Trapping and Optical Micromanipulation IX |
Editors | Kishan Dholakia, Gabriel C. Spalding |
Place of Publication | Bellingham |
Publisher | SPIE-International Society for Optical Engineering |
Number of pages | 8 |
ISBN (Print) | 9780819491756 |
DOIs | |
Publication status | Published - 2012 |
Event | SPIE Optics+Photonics 2012: Optical Trapping and Optical Micromanipulation IX - San Diego Convention Center, San Diego, United States Duration: 12 Aug 2012 → 16 Aug 2012 http://spie.org/x90258.xml |
Publication series
Name | Proceedings of SPIE |
---|---|
Publisher | SPIE-International Society for Optical Engineering |
Volume | 8458 |
ISSN (Print) | 0277-786X |
Conference
Conference | SPIE Optics+Photonics 2012: Optical Trapping and Optical Micromanipulation IX |
---|---|
Country/Territory | United States |
City | San Diego |
Period | 12/08/12 → 16/08/12 |
Internet address |
Keywords
- CHROMATOGRAPHY
- MANIPULATION
- Optical sorting
- SHAPE
- Optical manipulation
- SIZE
- Counter-propagating geometry
- Plasmon resonance
- Evanescent field
- Gold nanoparticle