Beaming circularly polarized photons from quantum dots coupled with plasmonic spiral antenna

被引：26

作者：

Rui, Guanghao ^{[1
,2
]}

Chen, Weibin ^{[1
]}

Abeysinghe, Don C. ^{[3
]}

Nelson, Robert L. ^{[4
]}

Zhan, Qiwen ^{[1
]}

机构：

[1] Univ Dayton, Electroopt Program, Dayton, OH 45469 USA

[2] Univ Sci & Technol China, Dept Opt & Opt Engn, Hefei 230026, Anhui, Peoples R China

[3] Univ Cincinnati, Dept Elect & Comp Engn, Cincinnati, OH 45219 USA

[4] USAF, Res Lab, Dayton, OH 45433 USA

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 17期

关键词：

UNIDIRECTIONAL EMISSION; NANOSTRUCTURES; FLUORESCENCE; LIGHT;

D O I：

10.1364/OE.20.019297

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Coupling nanoscale emitters via optical antennas enables comprehensive control of photon emission in terms of intensity, directivity and polarization. In this work we report highly directional emission of circularly polarized photons from quantum dots coupled to a spiral optical antenna. The structural chirality of the spiral antenna imprints spin state to the emitted photons. Experimental results reveal that a circular polarization extinction ratio of 10 is obtainable. Furthermore, increasing the number of turns of the spiral gives rise to higher antenna gain and directivity, leading to higher field intensity and narrower angular width of emission pattern in the far field. For a five-turn Archimedes' spiral antenna, field intensity increase up to 70-fold simultaneously with antenna directivity of 11.7 dB has been measured in the experiment. The highly directional circularly polarized photon emission from such optically coupled spiral antenna may find important applications in single molecule sensing, quantum optics information processing and integrated photonic circuits as a nanoscale spin photon source. (C) 2012 Optical Society of America

引用

页码：19297 / 19304

页数：8

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