Controlling the emission profile of a nanowire with a conical taper

被引：85

作者：

Gregersen, Niels ^{[1
]}

Nielsen, Torben R. ^{[1
]}

Claudon, Julien ^{[2
]}

Gerard, Jean-Michel ^{[2
]}

Mork, Jesper ^{[1
]}

机构：

[1] Tech Univ Denmark, DTU Foton, Dept Photon Engn, DK-2800 Kongens Lyngby, Denmark

[2] CEA, Inst Nanosci & Cryogenie, Lab Nanophys & Semicond, F-38054 Grenoble 9, France

来源：

OPTICS LETTERS | 2008年 / 33卷 / 15期

关键词：

D O I：

10.1364/OL.33.001693

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The influence of a tapering on nanowire light-emission profiles is studied. We show that, for nanowires with divergent output beams, the introduction of a conical tapering with a small opening angle reduces the beam divergence and increases transmission. This results in a dramatic increase in the collection efficiency of the detection optics. For a realistic tapering and a modest NA, the collection efficiency is enhanced by more than a factor of 2. This improvement is ensured by the adiabatic expansion of the guided mode in the tapering. (c) 2008 Optical Society of America.

引用

页码：1693 / 1695

页数：3

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