Near-field enhancement of optical second harmonic generation in hybrid gold–lithium niobate nanostructures

Rana Faryad Ali; Jacob A. Busche; Saeid Kamal; David J. Masiello; Byron D. Gates

doi:10.1038/s41377-023-01092-8

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Near-field enhancement of optical second harmonic generation in hybrid gold–lithium niobate nanostructures

Original Articles

- Near-field enhancement of optical second harmonic generation in hybrid gold–lithium niobate nanostructures
- Light: Science & Applications Vol. 12, Issue 5, Pages: 855-866(2023)
- Affiliations：
  
  1.Department of Chemistry and 4D LABS, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
  2.Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
- Author bio：
  
  Byron D. Gates (bgates@sfu.ca)
- Funds：
- DOI：10.1038/s41377-023-01092-8
  CLC：
- Published：31 May 2023，
  
  Published Online：25 April 2023，
  
  Received：16 September 2022，
  
  Revised：3 February 2023，
  
  Accepted：4 February 2023
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Ali, R.F. et al. Near-field enhancement of optical second harmonic generation in hybrid gold–lithium niobate nanostructures. Light: Science & Applications, 12, 855-866 (2023).
DOI：

Ali, R.F. et al. Near-field enhancement of optical second harmonic generation in hybrid gold–lithium niobate nanostructures. Light: Science & Applications, 12, 855-866 (2023). DOI： 10.1038/s41377-023-01092-8.

摘要

Abstract

Nanophotonics research has focused recently on the ability of nonlinear optical processes to mediate and transform optical signals in a myriad of novel devices

including optical modulators

transducers

color filters

photodetectors

photon sources

and ultrafast optical switches. The inherent weakness of optical nonlinearities at smaller scales has

however

hindered the realization of efficient miniaturized devices

and strategies for enhancing both device efficiencies and synthesis throughput via nanoengineering remain limited. Here

we demonstrate a novel mechanism by which second harmonic generation

a prototypical nonlinear optical phenomenon

from individual lithium niobate particles can be significantly enhanced through nonradiative coupling to the localized surface plasmon resonances of embedded gold nanoparticles. A joint experimental and theoretical investigation of single mesoporous lithium niobate particles coated with a dispersed layer of ~10 nm diameter gold nanoparticles shows that a ~32-fold enhancement of second harmonic generation can be achieved without introducing finely tailored radiative nanoantennas to mediate photon transfer to or from the nonlinear material. This work highlights the limitations of current strategies for enhancing nonlinear optical phenomena and proposes a route through which a new class of subwavelength nonlinear optical platforms can be designed to maximize nonlinear efficiencies through near-field energy exchange.

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Keywords

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