Squeezing Photons into a Point-Like Space
Squeezing Photons into a Point-Like Space
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DOI：
10.1021/acs.nanolett.5b01204
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发表时间：
2015-06-01
期刊：
影响因子：
10.8
通讯作者：
Lee, Yong-Hee
中科院分区：
文献类型：
--
作者：
Kim, Myung-Ki;Sim, Hongchul;Lee, Yong-Hee
将光子限制在尽可能小的体积内一直是纳米光子学界的目标。在本文中，我们提出并演示了一种三维（3D）间隙等离子体天线，该天线能够以3D方式实现极端光子压缩，模态体积为1.3 x 10(-7) lambda(3)（类似于4 x 10 x 10 nm(3)），强度增强为400000。在互补的纳米空转结构的中心形成一个三维锥形的4纳米气隙，通过离子铣削100纳米厚的金膜沿着所有三个维度使用近端铣削技术。在4 nm间隙天线中，可以观察到比100 nm间隙天线强27000倍的非线性二次谐波信号。此外，扫描阴极发光图像证实了在纳米间隙顶部20 x 20 nm(2)分辨率受限区域内的光子约束。
Confining photons in the smallest possible volume has long been an objective of the nanophotonics community. In this Letter, we propose and demonstrate a three-dimensional (3D) gap-plasmon antenna that enables extreme photon squeezing in a 3D fashion with a modal volume of 1.3 x 10(-7) lambda(3) (similar to 4 x 10 x 10 nm(3)) and an intensity enhancement of 400 000. A three-dimensionally tapered 4 nm air-gap is formed at the center of a complementary nanodiabolo structure by ion-milling 100 nm-thick gold film along all three dimensions using proximal milling techniques. From a 4 nm-gap antenna, a nonlinear second-harmonic signal more than 27 000-times stronger than that from a 100 nm-gap antenna is observed. In addition, scanning cathodoluminescence images confirm unambiguous photon confinement in a resolution-limited area 20 x 20 nm(2) on top of the nano gap.