Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

Juan Xia; Jianwei Tang; Fanglin Bao; Yongcheng Sun; Maodong Fang; Guanjun Cao; Julian Evans; Sailing He

doi:10.1038/s41377-020-00398-1

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Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot

Original Articles

- Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot
- Light: Science & Applications Vol. 9, Issue 5, Pages: 1599-1610(2020)
- Affiliations：
  
  1.Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, National Engineering Research Center for Optical Instrumentation, JORCEP, College of Optical Science and Engineering, Zhejiang University, 310058 Hangzhou, China
  2.School of Physics, Huazhong University of Science and Technology, 430074 Wuhan, China
  3.Centre for Optical and Electromagnetic Research, ZJU-SCNU Joint Center of Photonics, South China Academy of Advanced Optoelectronics, South China Normal University, 510006 Guangzhou, China
  4.Department of Electromagnetic Engineering, School of Electrical Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
- Author bio：
  
  Jianwei Tang (phystang@hust.edu.cn)
  Sailing He (sailing@kth.se)
- Funds：
- DOI：10.1038/s41377-020-00398-1
  CLC：
- Published：2020，
  
  Published Online：21 September 2020，
  
  Received：26 February 2020，
  
  Revised：13 August 2020，
  
  Accepted：01 September 2020
- Accepted：
Scan QR Code
Xia, J. et al. Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot. Light: Science & Applications, 9, 1599-1610 (2019).
DOI：

Xia, J. et al. Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot. Light: Science & Applications, 9, 1599-1610 (2019). DOI： 10.1038/s41377-020-00398-1.

摘要

Abstract

Optical nanoantennas can convert propagating light to local fields. The local-field responses can be engineered to exhibit nontrivial features in spatial

spectral and temporal domains

where local-field interferences play a key role. Here

we design nearly fully controllable local-field interferences in the nanogap of a nanoantenna

and experimentally demonstrate that in the nanogap

the spectral dispersion of the local-field response can exhibit tuneable Fano lineshapes with nearly vanishing Fano dips. A single quantum dot is precisely positioned in the nanogap to probe the spectral dispersions of the local-field responses. By controlling the excitation polarization

the asymmetry parameter

of the probed Fano lineshapes can be tuned from negative to positive values

and correspondingly

the Fano dips can be tuned across a broad spectral range. Notably

at the Fano dips

the local-field intensity is strongly suppressed by up to ~50-fold

implying that the hot spot in the nanogap can be turned into a cold spot. The results may inspire diverse designs of local-field responses with novel spatial distributions

spectral dispersions and temporal dynamics

and expand the available toolbox for nanoscopy

spectroscopy

nano-optical quantum control and nanolithography.

关键词

Keywords

references

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