Demonstration of the enhanced Purcell factor in all-dielectric structures

被引：75

作者：

Krasnok, Alexander ^{[1
]}

Glybovski, Stanislav ^{[1
]}

Petrov, Mihail ^{[1
]}

Makarov, Sergey ^{[1
]}

Savelev, Roman ^{[1
]}

Belov, Pavel ^{[1
]}

Simovski, Constantin ^{[1
,2
]}

Kivshar, Yuri ^{[1
,3
]}

机构：

[1] ITMO Univ, St Petersburg 197101, Russia

[2] Aalto Univ, Sch Elect Engn, POB 13000, Aalto 00076, Finland

[3] Australian Natl Univ, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia

来源：

APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 21期

基金：

澳大利亚研究理事会; 俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

FANO RESONANCE; NANOANTENNAS; ANTENNAS; OLIGOMERS; EMISSION; REGION;

D O I：

10.1063/1.4952740

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The Purcell effect is usually described as a modification of the spontaneous decay rate in the presence of a resonator. In plasmonics, this effect is commonly associated with a large local-field enhancement in "hot spots" due to the excitation of surface plasmons. However, high-index dielectric nanostructures, which become the basis of all-dielectric nanophotonics, cannot provide high values of the local-field enhancement due to larger radiation losses. Here, we demonstrate how to achieve a strong Purcell effect in all-dielectric nanostructures, and show theoretically that the Purcell factor can be increased by two orders of magnitude in a finite chain of silicon nanoparticles. Using the eigenmode analysis for an infinite chain, we demonstrate that the high Purcell factor regime is associated with a Van Hove singularity. We perform a proof-of-concept experiment for microwave frequencies and observe the 65-fold enhancement of the Purcell factor in a chain of 10 dielectric particles. Published by AIP Publishing.

引用

页数：4

共 35 条

[1] Low-Loss Electric and Magnetic Field-Enhanced Spectroscopy with Subwavelength Silicon Dimers [J].