Scanning evanescent fields using a pointlike light source and a nanomechanical DNA gear.
Nano Lett
; 12(1): 473-8, 2012 Jan 11.
Article
in En
| MEDLINE
| ID: mdl-22148854
ABSTRACT
The characterization of three-dimensional inhomogeneous illumination fields is a challenge in modern microscopy. Here we use a four-arm DNA junction as a nanomechanical translation stage to move a single fluorescent quantum dot through an exponentially decaying evanescent field. Recording the emission of the quantum dot within the evanescent field as well as under homogeneous illumination allows one to directly obtain the intensity distribution of the excitation field without additional deconvolution. Our method will allow the characterization of a broad range of illumination fields and to study near-field effects between small optical probes.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Photometry
/
Lighting
/
DNA
/
Quantum Dots
/
Micro-Electrical-Mechanical Systems
Language:
En
Journal:
Nano Lett
Year:
2012
Document type:
Article
Affiliation country:
Germany