Nanoscale thickness Octave-spanning coherent supercontinuum light generation

Susobhan Das; Md Gius Uddin; Diao Li; Yadong Wang; Yunyun Dai; Juha Toivonen; Hao Hong; Kaihui Liu; Zhipei Sun

doi:10.1038/s41377-024-01660-6

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Nanoscale thickness Octave-spanning coherent supercontinuum light generation

Original Articles

- Nanoscale thickness Octave-spanning coherent supercontinuum light generation
- Light: Science & Applications Vol. 14, Issue 2, Pages: 366-373(2025)
- Affiliations：
  
  1.Department of Electronics and Nanoengineering, Aalto University, Espoo, Finland
  2.QTF Centre of Excellence, Department of Applied Physics, Aalto University, Aalto, Finland
  3.Department of Engineering and Natural Sciences, Tampere University, Tampere, Finland
  4.State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, China
- Author bio：
  
  Susobhan Das (susobhan.das@aalto.fi)
  Zhipei Sun (zhipei.sun@aalto.fi)
- Funds：
- DOI：10.1038/s41377-024-01660-6
  CLC：
- Received：07 May 2024，
  
  Revised：01 October 2024，
  
  Accepted：2024-10-13，
  
  Published Online：09 January 2025，
  
  Published：28 February 2025
- Accepted：
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Das, S. et al. Nanoscale thickness Octave-spanning coherent supercontinuum light generation. Light: Science & Applications, 14, 366-373 (2025).
DOI：

Das, S. et al. Nanoscale thickness Octave-spanning coherent supercontinuum light generation. Light: Science & Applications, 14, 366-373 (2025). DOI： 10.1038/s41377-024-01660-6.

摘要

Abstract

Coherent broadband light generation has attracted massive attention due to its numerous applications ranging from metrology

sensing

and imaging to communication. In general

spectral broadening is realized via third-order and higher-order nonlinear optical processes (e.g.

self-phase modulation

Raman transition

four-wave mixing

multiwave mixing)

which are typically weak and thus require a long interaction length and the phase matching condition to enhance the efficient nonlinear light-matter interaction for broad-spectrum generation. Here

for the first time

we report octave-spanning coherent light generation at the nanometer scale enabled by a phase-matching-free frequency down-conversion process. Up to octave-spanning coherent light generation with a −40dB spectral width covering from ~565 to 1906 nm is demonstrated in discreate manner via difference-frequency generation

a second-order nonlinear process in gallium selenide and niobium oxide diiodide crystals at the 100-nanometer scale. Compared with conventional coherent broadband light sources based on bulk materials

our demonstration is ~5 orders of magnitude thinner and requires ~3 orders of magnitude lower excitation power. Our results open a new way to possibly create compact

versatile and integrated ultra-broadband light sources.

关键词

Keywords

references

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