Quantum dots as single-photon sources: Antibunching via two-photon excitation

被引：16

作者：

Wissert, Matthias D. ^{[1
]}

Rudat, Birgit ^{[1
]}

Lemmer, Uli ^{[1
]}

Eisler, Hans-Juergen ^{[1
]}

机构：

[1] KIT, LTI, DFG Heisenberg Grp Nanoscale Sci, DE-76131 Karlsruhe, Germany

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 11期

关键词：

SEMICONDUCTOR NANOCRYSTALS; ROOM-TEMPERATURE; FLUORESCENCE; ABSORPTION; MICROSCOPY;

D O I：

10.1103/PhysRevB.83.113304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two-photon excitation induced photoluminescence (2PE-PL) microscopy of CdSe colloidal quantum dots at the single-entity level is demonstrated. We provide evidence for single nanoparticle microscopy in the two-photon excitation regime by varying the laser excitation average power, as well as by measuring the confocal point spread function in three dimensions with a single quantum dot. Model calculations of the point spread function are in good agreement with our experimental findings in the 2PE-PL nonsaturation regime. Ultimately, we observe photon antibunching and triggered single-photon emission at room temperature from those quantum nanostructures under two-photon excitation in a well-defined three-dimensional photonic volume.

引用

页数：4

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