We demonstrate near-field fluorescence excitation and imaging with a quantum dot (QD) light emitting diode (QDLED) integrated at the tip of a scanning probe. The tip-embedded QDLED is employed in a near-field scanning optical microscopy setup to directly excite a secondary colloidal QD sample. Electrically pumped QDs enable multi-color, self-illuminating probes with no conventional optics needed for light coupling. Monolayer QDs stamped at the very tip of a micromachined silicon probe facilitates precise position control of the ultra-thin (10–15 nm) light source. Sensitivity of fluorescence intensity to the QDLED–QD sample distance was measured down to 50 nm order, demonstrating spatially resolved imaging.
Nanoscale fluorescence imaging with quantum dot near-field electroluminescence
Kazunori Hoshino, Ashwini Gopal, Micah S. Glaz, David A. Vanden Bout, Xiaojing Zhang; Nanoscale fluorescence imaging with quantum dot near-field electroluminescence. Appl. Phys. Lett. 23 July 2012; 101 (4): 043118. https://doi.org/10.1063/1.4739235
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