dorsal/arxiv
View SchemaInteraction of scanning probes with semiconductor nanocrystals; Physical mechanism and basis for near field optical imaging
| Authors | Yuval Ebenstein, Eyal Yoskovitz, Ronny Costi, Asaf Aharoni, Uri Banin |
|---|---|
| Categories | |
| ArXiv ID | physics/0511223 |
| URL | https://arxiv.org/abs/physics/0511223 |
| DOI | 10.1021/jp056229o |
Abstract
We investigate the modification of photoluminescence (PL) from single semiconductor nanocrystal quantum dots (NCs) in proximity of metal and semiconducting Atomic Force Microscope (AFM) tips. The presence of the tip alters the radiative decay rate of an emitter via interference and opens efficient non radiative decay channels via energy transfer to the tip material. These effects cause quenching (or enhancement) of the emitter's PL intensity, as a function of its distance from the interacting tip. We take advantage of this highly distance dependent effect to realize a contrast mechanism for high resolution optical imaging. AFM tips are optimized as energy acceptors by chemical functionalization with InAs NCs to achieve optical resolution down to 30 nm. The presented experimental scheme offers high resolution optical information while maintaining the benefits of traditional AFM imaging. We directly measure the PL intensity of single NCs as a function of the tip distance. Our results are in good agreement to calculation made by a classical theoretical model describing an oscillating dipole interacting with a planar mirror.
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"abstract": "We investigate the modification of photoluminescence (PL) from single\nsemiconductor nanocrystal quantum dots (NCs) in proximity of metal and\nsemiconducting Atomic Force Microscope (AFM) tips. The presence of the tip\nalters the radiative decay rate of an emitter via interference and opens\nefficient non radiative decay channels via energy transfer to the tip material.\nThese effects cause quenching (or enhancement) of the emitter\u0027s PL intensity,\nas a function of its distance from the interacting tip. We take advantage of\nthis highly distance dependent effect to realize a contrast mechanism for high\nresolution optical imaging. AFM tips are optimized as energy acceptors by\nchemical functionalization with InAs NCs to achieve optical resolution down to\n30 nm. The presented experimental scheme offers high resolution optical\ninformation while maintaining the benefits of traditional AFM imaging. We\ndirectly measure the PL intensity of single NCs as a function of the tip\ndistance. Our results are in good agreement to calculation made by a classical\ntheoretical model describing an oscillating dipole interacting with a planar\nmirror.",
"arxiv_id": "physics/0511223",
"authors": [
"Yuval Ebenstein",
"Eyal Yoskovitz",
"Ronny Costi",
"Asaf Aharoni",
"Uri Banin"
],
"categories": [
"physics.chem-ph",
"cond-mat.mes-hall",
"physics.optics"
],
"doi": "10.1021/jp056229o",
"title": "Interaction of scanning probes with semiconductor nanocrystals; Physical mechanism and basis for near field optical imaging",
"url": "https://arxiv.org/abs/physics/0511223"
},
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