IFIBA 22255
INSTITUTO DE FISICA DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Optical imaging with plasmonic probes
Autor/es:
ANDREA V. BRAGAS; ALBERTO F. SCARPETTINI
Lugar:
San Carlos De Bariloche, Argentina
Reunión:
Workshop; US-Argentina Workshop on Nanomaterials; 2009
Institución organizadora:
UNIVERSIDAD DE BUENOS AIRES-UNOVERSIDAD DE CALIFORNIA
Resumen:
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New plasmonic probes based on nanoparticle-decorated
silica spheres are introduced. Silver and gold nanoparticles act as enhancers
of the optical field, supplying high resolution optical images in a Field
Enhancement Scanning Optical Microscope. The optical resolution is dependent on
the wavelength and polarization of the exciting field. Approach curves reveal
that the enhancement is due to cavity modes between the plasmonic probe and the
sample. These probes can achieve images with subnanometric optical resolution when
atomic corrugated samples are sensed. Also, it has been demonstrated that the
probes are sensitive to the material nature (dielectric constant) even in the absence
of image contrast by other high-sensitive method as is the tunneling current.
