School of Engineering and Department of Physics, Brown University, Providence, Rhode Island 02912, USA.
Phys Rev Lett. 2018 Nov 30;121(22):227403. doi: 10.1103/PhysRevLett.121.227403.
We experimentally demonstrate that the radiative decay rate of a quantum emitter is determined by the combined electric and magnetic local density of optical states (LDOS). A Drexhage-style experiment was performed for two distinct quantum emitters, divalent nickel ions in magnesium oxide and trivalent erbium ions in yttrium oxide, which both support nearly equal mixtures of isotropic electric dipole and magnetic dipole transitions. The disappearance of lifetime oscillations as a function of emitter-interface separation distance confirms that the electromagnetic LDOS refers to the total mode density, and thus similar to thermal emission, these unique electronic emitters effectively excite all polarizations and orientations of the electromagnetic field.
我们通过实验证明，量子发射器的辐射衰减速率取决于光态（LDOS）的电场和磁场局部密度的组合。对于两种不同的量子发射器，我们进行了 Drexhage 式实验，这两种量子发射器分别为氧化镁中的二价镍离子和氧化钇中的三价铒离子，它们都支持几乎相等的各向同性电偶极子和磁偶极子跃迁的混合。随着发射器与界面之间的分离距离的增加，寿命振荡的消失证实了电磁 LDOS 指的是总模式密度，因此与热发射类似，这些独特的电子发射器有效地激发了电磁场的所有极化和方向。
