Modification of Spontaneous Emission Rates of Self-assembled CdSe Quantum Dots by Coupling to Hybrid Optical Nanoantennas

The spontaneous emission of a light source can be modified by tailoring its local density of optical states. Indeed, this concept has been commonly utilized to enhance the spontaneous emission of III–V self-assembled quantum dots (SAQDs) at low temperature using high-quality dielectric cavities. Unf...

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Bibliographic Details
Published in:Plasmonics (Norwell, Mass.) Mass.), 2017-04, Vol.12 (2), p.433-438
Main Authors: Wang, Jyh-Shyang, Chiu, Kuo-Pin, Lin, Chien-Yon, Tsai, Yu-Hsuan, Yuan, Chi-Tsu
Format: Article
Language:English
Subjects:
Biochemistry
Biological and Medical Physics
Biophysics
Biotechnology
Chemistry
Chemistry and Materials Science
Coupling
Decay rate
High temperature
Light sources
Low temperature
Nanoantennas
Nanotechnology
Photoluminescence
Quantum dots
Room temperature
Self-assembly
Spectral emittance
Spontaneous emission
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Summary:The spontaneous emission of a light source can be modified by tailoring its local density of optical states. Indeed, this concept has been commonly utilized to enhance the spontaneous emission of III–V self-assembled quantum dots (SAQDs) at low temperature using high-quality dielectric cavities. Unfortunately, such dielectric cavities cannot be successfully applied to spectrally broad light sources, for example, II–VI SAQDs emitting at elevated temperature. To address this issue, here we utilized a hybrid metal-dielectric antenna with broad coupling bandwidth as an alternative to enhance the spontaneous emission of II–VI CdSe SAQDs operating at room temperature. Upon coupling, the photoluminescence (PL) intensity for all spectral ranges can be enhanced accompanied with PL lifetime shortening. By analyzing our experimental data, we found that the radiative decay rates can be enhanced while keeping nonradiative process less affected, leading to overall PL enhancement.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-016-0282-6