Strong fluorescence-signal gain with single-excitation-enhancing and emission-directing nanostructured diffraction grating.
Opt Lett
; 34(20): 3208-10, 2009 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-19838275
ABSTRACT
A dielectric subwavelength diffraction grating structure is designed and fabricated in order to enhance fluorescence-based detection of biomolecules. Two separate phenomena, enhancement of the local energy densities of the excitation illumination and direction of the emitted signal toward the detector, are examined theoretically and experimentally. 530-fold enhancement of detected signal is achieved compared with the signal from flat surface. Also, changes in polarization and coherence properties of the fluorescent light are found to be remarkable.
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Base de dados:
MEDLINE
Assunto principal:
Refratometria
/
Espectrometria de Fluorescência
/
Óptica e Fotônica
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article