Directional quantum dot emission by soft-stamping on silicon Mie resonators

被引：4

作者：

Veeken, Tom ^{[1
]}

Daiber, Benjamin ^{[1
]}

Agrawal, Harshal ^{[1
]}

Aarts, Mark ^{[1
]}

Alarcon-Llado, Esther ^{[1
]}

Garnett, Erik C. ^{[1
]}

Ehrler, Bruno ^{[1
]}

van de Groep, Jorik ^{[2
]}

Polman, Albert ^{[1
]}

机构：

[1] AMOLF, Ctr Nanophoton, NWO Inst, Sci Pk 104, NL-1098 XG Amsterdam, Netherlands

[2] Univ Amsterdam, Inst Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

来源：

NANOSCALE ADVANCES | 2022年 / 4卷 / 04期

基金：

荷兰研究理事会;

关键词：

RESONANCES;

D O I：

10.1039/d1na00630d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present a soft-stamping method to selectively print a homogenous layer of CdSeTe/ZnS core-shell quantum dots (QDs) on top of an array of Si nanocylinders with Mie-type resonant modes. Using this new method, we gain accurate control of the quantum dot's angular emission through engineered coupling of the QDs to these resonant modes. Using numerical simulations we show that the emission into or away from the Si substrate can be precisely controlled by the QD position on the nanocylinder. QDs centered on a 400 nm diameter nanocylinder surface show 98% emission directionality into the Si substrate. Alternatively, for homogenous ensembles placed over the nanocylinder top-surface, the upward emission is enhanced 10-fold for 150 nm diameter cylinders. Experimental PL intensity measurements corroborate the simulated trends with cylinder diameter. PL lifetime measurements reflect well the variations of the local density of states at the QD position due to coupling to the resonant cylinders. These results demonstrate that the soft imprint technique provides a unique manner to directly integrate optical emitters with a wide range of nanophotonic geometries, with potential applications in LEDs, luminescent solar concentrators, and up- and down-conversion schemes for improved photovoltaics.

引用

页码：1088 / 1097

页数：10