Quasi-BIC Modes in All-Dielectric Slotted Nanoantennas for Enhanced Er3+Emission

被引:16
作者
Kalinic, Boris [1 ]
Cesca, Tiziana [1 ]
Balasa, Ionut Gabriel [1 ]
Trevisani, Mirko [1 ]
Jacassi, Andrea [2 ]
Maier, Stefan A. [2 ,3 ]
Sapienza, Riccardo [2 ]
Mattei, Giovanni [1 ]
机构
[1] Univ Padua, Dept Phys & Astron, I-35131 Padua, Italy
[2] Imperial Coll London, Dept Phys, Blackett Lab, London SW7 2BW, England
[3] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia
基金
英国工程与自然科学研究理事会;
关键词
all-dielectric nanoantenna; quasi-BIC; erbium; decay rate enhancement; nanoslot; metasurface; EMISSION; NANOPHOTONICS; OPTICS; STATE; LIGHT;
D O I
10.1021/acsphotonics.2c01703
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In the quest for new and increasingly efficient photon sources, the engineering of the photonic environment at the subwavelength scale is fundamental for controlling the properties of quantum emitters. A high refractive index particle can be exploited to enhance the optical properties of nearby emitters without decreasing their quantum efficiency, but the relatively modest Q-factors (Q 5- 10) limit the local density of optical states (LDOS) amplification achievable. On the other hand, ultrahigh Q-factors (up to Q 109) have been reported for quasi-BIC modes in all-dielectric nanostructures. In the present work, we demonstrate that the combination of quasi-BIC modes with high spectral confinement and nanogaps with spacial confinement in silicon slotted nanoantennas lead to a significant boosting of the electromagnetic LDOS in the optically active region of the nanoantenna array. We observe an enhancement of up to 3 orders of magnitude in the photoluminescence intensity and 2 orders of magnitude in the decay rate of the Er3+ emission at room temperature and telecom wavelengths. Moreover, the nanoantenna directivity is increased, proving that strong beaming effects can be obtained when the emitted radiation couples to the high Q-factor modes. Finally, via tuning the nanoanntenna aspect ratio, a selective control of the Er3+ electric and magnetic radiative transitions can be obtained, keeping the quantum efficiency almost unitary.
引用
收藏
页码:534 / 543
页数:10
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