Large optical nonlinearity enabled by coupled metallic quantum wells

Haoliang Qian; Shilong Li; Ching-Fu Chen; Su-Wen Hsu; Steven Edward Bopp; Qian Ma; Andrea R. Tao; Zhaowei Liu

doi:10.1038/s41377-019-0123-4

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Large optical nonlinearity enabled by coupled metallic quantum wells

Letters

- Large optical nonlinearity enabled by coupled metallic quantum wells
- Light: Science & Applications Vol. 8, Issue 1, Pages: 22-28(2019)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
  2.Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
  3.Materials Science and Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
  4.Center for Memory and Recording Research, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
- Author bio：
  
  Zhaowei Liu (zhaowei@ucsd.edu)
- Funds：
- DOI：10.1038/s41377-019-0123-4
  CLC：
- Published：2019，
  
  Published Online：23 January 2019，
  
  Received：24 July 2018，
  
  Revised：24 December 2018，
  
  Accepted：07 January 2019
- Accepted：
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Qian, H. L. et al. Large optical nonlinearity enabled by coupled metallic quantum wells. Light: Science & Applications, 8, 22-28 (2019).
DOI：

Qian, H. L. et al. Large optical nonlinearity enabled by coupled metallic quantum wells. Light: Science & Applications, 8, 22-28 (2019). DOI： 10.1038/s41377-019-0123-4.

摘要

Abstract

New materials that exhibit strong second-order optical nonlinearities at a desired operational frequency are of paramount importance for nonlinear optic

s. Giant second-order susceptibility

(2)

has been obtained in semiconductor quantum wells (QWs). Unfortunately

the limited confining potential in semiconductor QWs causes formidable challenges in scaling such a scheme to the visible/near-infrared (NIR) frequencies for more vital nonlinear-optic applications. Here

we introduce a metal/dielectric heterostructured platform

i.e.

TiN/Al

epitaxial multilayers

to overcome that limitation. This platform has an extremely high

(2)

of approximately 1500 pm/V at NIR frequencies. By combining the aforementioned heterostructure with the large electric field enhancement afforded by a nanostructured metasurface

the power efficiency of second harmonic generation (SHG) achieved 10

at an incident pulse intensity of 10 GW/cm

which is an improvement of several orders of magnitude compared to that of previous demonstrations from nonlinear surfaces at similar frequencies. The proposed quantum-engineered heterostructures enable efficient wave mixing at visible/NIR frequencies into ultracompact nonlinear optical devices.

关键词

Keywords

references

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