Nanoscale Imaging with a Single Quantum Dot
MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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The ability to optically image with nanometer resolution is essential for understanding the electromagnetic properties of nanoscopic objects. The most common methods for performing nanoscale imaging are based on near-field scanning optical microscopy, which utilizes a tapered probe that can add unwanted distortion to images. Such distortion can be eliminated by probing with an isolated, point-like emitter. Here we present a method for performing nanoscale imaging using a deterministically positioned single quantum dot QD. The QD is manipulated to nanoscale precision by microfluidic flow control, which does not require the use of macroscopic manipulators. We use this technique to image the surface plasmon polariton SPP mode of a silver nanowire with resolution as fine as 10 nm by monitoring the coupling efficiency into the wire mode. The measured field distribution reveals nanoscale features such as localized modes at the wire ends and interference in the propagating SPP waves.
- Electrical and Electronic Equipment
- Fluidics and Fluerics
- Plasma Physics and Magnetohydrodynamics
- Quantum Theory and Relativity