Observation of self-assembled fluorescent beads by scanning near-field optical microscopy and atomic force microscopy.
Optical response and topography of fluorescent latex beads both on flat self-assembled monolayer and on a micron-patterned surface with poly(dimethylsiloxane) are studied. Scanning near-field optical microscopy and atomic force microscopy were utilized together for detecting fluorescence and imaging topography of the patterned latex beads, respectively. As a result, the micro-patterned latex beads where a specific chemical binding occurred show a strong signal, whereas no signals are observed in the case of nonspecific binding. With fluorescein isothiocyanate (FITC), it is convenient to measure fluorescence signal from the patterned beads allowing us to monitor the small balls of fluorescent latex.
Oh
Y J
YJ
Department of Physics and Division of Nanosciences, Ewha Womans University, Seoul 120-750, Republic of Korea.
Jo
W
W
Kim
Min-Gon
MG
Kyu Park
Hyun
H
Hyun Chung
Bong
B